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    v1.0.28
    OpenPayerPolicy UpdatesProsthetics & OrthoticsUniveraHealthcare External Prosthetic Coverage Upd…
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    CurrentuniverahealthcarePolicy 1.01.18

    External Prosthetic Devices

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    Governs medical necessity and coverage criteria for external prosthetic devices and related supplies for Univera Healthcare members; excludes implantable prosthetics and orthotic devices and applies to external prostheses for upper and lower limbs and related supplies.

    Policy Summary
    Payeruniverahealthcare
    PolicyExternal Prosthetic Devices
    Policy CodePolicy 1.01.18
    Change TypeAnnual review — no material changes
    Effective DateAug 17, 2026
    Last ReviewApr 16, 2026
    Next Review DateApr 1, 2027
    Key ActionObtain prior authorization for external prosthetic devices and include HCPCS L-codes and functional level documentation.
    SourceLink
    POLICY UPDATE CHANGES

    No material clinical or coverage changes in this revision.

    24pages
    K1+min K-level for basic prosthesis
    K3+K-level for advanced devices
    1-4functional levels used
    L5991,L6026E/I codes listed

    Coverage Criteria

    inv-01: General Medical Appropriateness

    Covered when ALL of the following are met

    Basic coverage: Device replaces all or part of an internal organ or replaces the function of a permanently inoperative or malfunctioning body part.

    Includes supplies necessary to make the device functional (e.g., tracheostomy kits, ostomy supplies, urine pouches, batteries).

    inv-02: Preparatory Prosthesis

    Preparatory prosthesis coverage

    Preparatory prosthesis: Provided after surgery to prevent edema of the residual limb and to enhance functional recovery.

    Advanced nonstandard components and certain additions (protective covers, ultralight material, microprocessor knees, flex foot systems, energy-storing components) are not medically necessary for preparatory prostheses.

    inv-03: Lower Extremity Component Criteria

    Policy Summary
    Payeruniverahealthcare
    PolicyExternal Prosthetic Devices
    Policy CodePolicy 1.01.18
    Change TypeAnnual review — no material changes
    Effective DateAug 17, 2026
    Last ReviewApr 16, 2026
    Next Review DateApr 1, 2027
    Key ActionObtain prior authorization for external prosthetic devices and include HCPCS L-codes and functional level documentation.
    SourceLink
    On This Page
    Coverage CriteriaCodingProvider Actions & Prior AuthorizationBackgroundDefinitionsRevision History

    Lower extremity prosthesis — component selection by functional level

    Functional-level mapping: Selection of knee, pylon, and foot components must align with the member's functional level (1–4) as defined in the Description section.

    Examples: single-axis knees and SACH/single-axis feet for level 1+; flexible-keel or multi-axial feet for level 2+; fluid/pneumatic knees and energy-storing/dynamic response/flex foot systems for level 3+; high-activity knee control frames for level 4.

    inv-04: Component coverage by functional level

    Basic preparatory or permanent lower limb prosthetic devices are considered medically appropriate when component and functional level match:

    Level 1+ components: Basic preparatory or permanent lower limb prosthetic devices appropriate for individuals with functional level 1 or greater (examples: single-axis knee, SACH foot [L5970], single-axis ankle/foot [L5974]).functional level >=1

    Refer to Description for functional level definitions

    Level 2 components: Flexible-keel foot (L5972) or multi-axial ankle/foot (L5978).functional level >=2
    Level 3 components: Energy-storing foot (L5976), dynamic response foot with multi-axial ankle (L5979), flex foot system (L5980), flexwalk system or equal (L5981), or shank foot system with vertical loading pylon (L5987).functional level >=3
    Prosthetic shoe: A prosthetic shoe as a terminal device (L3250) to supplement a substantially absent foot.

    inv-05: Socket rules

    Socket coverage rules:

    Sockets allowed: One (1) socket per individual prosthetic.
    Socket inserts: Two (2) of the same socket inserts per individual prosthesis at the same time.
    Test sockets: Up to two (2) test sockets when fitting for a socket.

    Test sockets are not recommended for immediate postsurgical or early fitting prostheses.

    inv-06: Microprocessor knee medical necessity criteria

    Microprocessor-controlled knee prosthesis (e.g., L5856) is considered medically appropriate when ALL of the following are met:

    Amputation level: For persons with a knee disarticulation amputee OR transfemoral amputee.
    Functional level 3 or above.functional level >=3
    Step therapy: Lower-level prosthetic devices (e.g., fluid, pneumatic, etc.) cannot be used or are insufficient to meet the functional needs of the individual in performing ADLs.
    Medical fitness: The patient has adequate cardiovascular and pulmonary reserve.
    Training and cognition: The patient has received additional training for use of this technology and has demonstrated adequate cognitive ability to master use and care requirements.
    Functional need demonstration: Patient demonstrated need for long distance ambulation at variable rates, regular and frequent ambulation on uneven terrain, and regular and frequent ambulation on stairs or ramps; functional evaluation indicates that with training a microprocessor-controlled knee is likely to meet functional needs.

    inv-07: VASS coverage criteria

    Vacuum-assisted socket systems (VASS) are considered medically appropriate in either of the following situations:

    Nonhealing breakdown: There is a nonhealing skin breakdown on the stump from friction due to an ill-fitting socket.
    Unmodifiable socket: The current socket can no longer be modified to adequately secure the limb to the prosthesis.

    inv-08: Microprocessor-controlled knee: Medical appropriateness and contraindications

    Microprocessor-controlled knee is considered medically appropriate when ALL of the following are met

    Knee criteria group

    • Contraindications: Patient's functional level less than 3 or limited ambulation due to poor balance/ataxia; unable to tolerate weight of the prosthesis; unable to use the swing and stance features; unable to change the prosthesis or has a condition causing inadequate fitting; significant hip flexion contracture (>20 degrees); significant deformity of the remaining limb impairing stride; prosthesis use in environments with excessive moisture or dust that would invalidate warranty.

      Presence of any of these contraindications makes device inappropriate.

    inv-09: Microprocessor-controlled ankle-foot (L5973): Medical appropriateness

    Microprocessor-controlled ankle-foot prosthesis (L5973) is considered medically appropriate when ALL of the following criteria are met

    Ankle-foot criteria group: Applicable to persons with a transtibial amputation; functional level of 3 or above; lower-level prosthetic devices (e.g., SACH foot) cannot be used or are insufficient to meet ADL functional needs; the patient has adequate cardiovascular and pulmonary reserve; the patient has received additional training and demonstrated adequate cognitive ability; the patient demonstrates need for long distance ambulation at variable rates, regular and frequent ambulation on uneven terrain, and regular and frequent ambulation on stairs or ramps; and functional evaluation indicates that with training this device will meet functional needs.

    All listed conditions must be documented.

    inv-10: Microprocessor-controlled ankle-foot prosthesis (non-power assist)

    Covered when ALL of the following are met

    Functional evaluation indicates that with training, use of a microprocessor-controlled ankle-foot prosthesis is likely to meet the functional needs of the individual.

    inv-11: Conventional body-powered upper extremity prosthesis

    Covered when ALL of the following are met

    Standard coverage: A conventional body-powered, upper extremity prosthesis is considered medically appropriate to replace all or part of an upper extremity or replace the function of a permanently inoperative or malfunctioning upper extremity.

    inv-12: Myoelectric upper arm prosthetic components — medical necessity criteria

    Covered when ALL of the following are met

    Body-powered insufficient: Standard body-powered prosthetic devices cannot be used or are insufficient to meet the functional needs of the individual in performing ADLs.
    Residual musculature threshold: The remaining musculature of the arm(s) contains the minimum microvolt threshold to allow operation of a myoelectric prosthetic device.
    No interfering comorbidities: The patient is free of comorbidities that could interfere with function of the prosthesis (e.g., neuromuscular disease).
    Sufficient physiological and cognitive function: The patient has demonstrated sufficient physiological and cognitive function to allow effective operation of a myoelectric prosthetic device.
    Functional evaluation predicts benefit: Functional evaluation indicates that with training, use of a myoelectric prosthesis is likely to meet the functional needs of the individual (e.g., gripping, releasing, holding, and coordinating movement) when performing ADLs. Evaluation should consider control, durability, function, and usability.

    inv-13: Repair of medically necessary external prosthetic or components

    Repair is considered medically appropriate when ALL of the following are met

    Documentation elements: Physician documentation includes date of device implantation/initiation, manufacturer warranty information if applicable, and attestation that the patient has been compliant and will continue to benefit from the device.
    Device no longer functioning: The device is no longer functioning adequately and inadequate function interferes with activities of daily living.
    Repair expected to restore function: Repair is expected to make the equipment fully functional as defined by the manufacturer.

    inv-14: Repair (Covered when ALL criteria met)

    Repair of a prosthetic device is covered when ALL of the following are met

    Repair coverage

    • Repair functional expectation: repair is expected to make the equipment fully functional (as defined by manufacturer).

    inv-15: Replacement (Covered when ANY criteria met)

    Replacement of a medically necessary external prosthetic or components not under warranty is covered when ANY of the following are met

    Replacement coverage: Either the device is nonrepairable or repair cost exceeds replacement cost; OR there is documentation that a change in the patient's condition makes the present unit nonfunctional and improvement is expected with a replacement unit.

    inv-16: Not Medically Necessary Replacements

    NMN replacement: Replacement of a properly functioning external prosthetic, its components or accessories due to desire for advanced technology or improved aesthetics is considered not medically necessary.

    Includes replacements for aesthetic or technology-upgrade reasons.

    inv-17: Functional Ambulation Levels (K-levels)

    Functional ambulation (K) levels defined:

    Level 1: Has the ability or potential to use a prosthesis for transfers or ambulation on level surfaces at fixed cadence. Typical of the limited and unlimited household ambulator.
    Level 2: Has the ability or potential for ambulation with the ability to traverse low level environmental barriers, such as curbs, stairs, or uneven surfaces. Typical of the limited community ambulator.
    Level 3: Has the ability or potential for ambulation with variable cadence. Typical of the community ambulator who can traverse most environmental barriers and may have vocational, therapeutic, or exercise activity that demands prosthetic utilization beyond simple locomotion.
    Level 4: Has the ability or potential for prosthetic ambulation that exceeds basic ambulation skills, exhibiting high impact, stress, or energy levels. Typical of the prosthetic demands of the child, active adult, or athlete.

    inv-18: Component descriptions and level-based recommendations

    Device component descriptions and typical indications:

    Lower-limb components: Basic preparatory or definitive lower-limb prosthesis components: socket, suspension mechanism, knee joint, pylon, and terminal device (foot). Socket types can be soft or hard; suspension options include locking pin, TES belt, suspension sleeve, waist belt, suction, vacuum, and vacuum-assisted socket systems (VASS).
    Knee joint recommendations: Single-axis knees recommended for classification level 1 or above; polycentric-axis and hydraulic knees recommended for level 3 or above; microprocessor-controlled knees adjust for variable gait and uneven terrain.
    Upper-limb components: Conventional body-powered upper extremity prostheses components include socket, suspension, control-cable system (passive, body-powered, myoelectric), terminal device, and interposing joints as needed.

    inv-19: Advanced devices: microprocessor, powered ankles, and osseointegration

    Advanced prosthetic devices and evidence summary:

    Microprocessor knees/ankles evidence: Systematic reviews and multiple studies report improved mobility, reduced falls/fear of falling, and improved patient-reported outcomes for microprocessor prosthetic knees and ankles in selected populations, though heterogeneity and small sample sizes limit definitive conclusions.
    Powered ankle evidence: Small crossover trials of powered ankle-foot prostheses show inconsistent objective benefits for metabolic cost and walking speed; subjective measures sometimes improved and some high-activity (K4) subgroups may derive energy savings.

    Evidence insufficient for universal functional benefit; consider individual patient factors and K-levels.

    Osseointegration evidence: Osseointegration offers potential advantages (improved mechanical transfer, reduced socket-related skin issues, improved ROM) but carries risks of infection, implant failure, and fracture; evidence is observational with notable complication rates.

    Intended for select patients when socket prostheses are insufficient.

    inv-20: Powered ankle-foot prostheses

    Evidence summary and implication for coverage decisions

    powered ankle evidence: Randomized and crossover trials (e.g., Gardinier 2018; Kim 2021) found no statistically significant improvements in metabolic cost, preferred walking speed, or daily step counts with powered ankle prostheses compared to unpowered devices; subjective measures sometimes improved but did not consistently correlate with objective function.

    Consider K-level and individual patient response; evidence does not support universal coverage without demonstrated need.

    inv-21: Myoelectric multi-grip and partial-hand prostheses

    Evidence summary and implication for coverage decisions

    multi-grip hand evidence: Studies report mixed outcomes for myoelectric multi-grip hands compared with standard myoelectric hands; some users show functional improvements (notably partial-hand users) but concerns exist about durability and generalizability due to small samples and device heterogeneity.

    inv-22: Osseointegration (OI) for lower-limb amputees

    Advanced prosthetic devices and evidence summary:

    Osseointegration evidence: Observational cohort and retrospective studies report mobility and quality-of-life improvements after osseointegration for select patients (e.g., failed socket rehabilitation), but significant rates of complications (soft tissue infection, osteomyelitis, neuromas, mechanical complications) and implant removals have been reported.

    Evidence limited by small sizes and nonrandomized designs; guideline bodies note special arrangements or further study may be needed.

    The policy excludes coverage for back-up prosthetic devices and additional prostheses provided primarily for convenience, noting that more than one prosthetic device is considered a matter of member convenience and therefore not medically necessary. Prostheses intended primarily for activities beyond normal activities of daily living (for example, leisure or sporting activities such as skiing or swimming) are likewise not medically necessary. Devices or implants used primarily for cosmetic purposes are explicitly listed as not medically necessary. In addition, osseointegration surgery and/or prostheses (e.g., OPRA) are classified as investigational in this policy. Finally, additions that are nonstandard for preparatory prostheses (including protective covers, ultralight materials, microprocessor knees, and flex/energy-storing foot systems) are not considered medically necessary when requested as part of a preparatory device.

    For socket fitting, the policy states that test sockets are not recommended for immediate postsurgical or early fitting prostheses. This guidance should be applied when ordering early or immediate post-op sockets and documented in the fitting plan.

    The policy explicitly lists lower limb prosthetic devices for individuals with functional level 0 (no ability or potential to ambulate or transfer safely) as not medically necessary. Requests for prosthetic components for members with K-level 0 should be denied as not medically necessary per the policy.

    Advanced myoelectric hands that provide individual digit control (examples: Michelangelo hand, AxonArm Ergo, ProDigits) and enhanced-dexterity upper-limb systems integrating both sensor and myoelectric control (example: LUKE Arm/DEKA) are considered investigational by this policy. The policy characterizes these devices as having limited and mixed evidence and therefore not eligible for routine coverage.

    Repairs for equipment that was damaged or lost due to patient neglect, theft, or abuse, or when an alternative coverage source exists (for example, homeowners, rental, auto, or liability insurance), are ineligible for coverage. Providers should identify other available payers prior to submitting repair claims.

    Replacement or repair claims for prosthetic equipment lost or damaged because of patient neglect, theft, or abuse, or when another available coverage source can reasonably be pursued (e.g., homeowners, auto, or liability insurance), are not covered under this policy. Documentation confirming the absence of alternate coverage and circumstances of loss or damage is required if coverage is to be considered.

    Vacuum-assisted socket systems (VASS) and osseointegration are addressed with caution. The policy notes that VASS does not have sufficient evidence of superiority for all patients and may be appropriate only when the current socket cannot be modified or when there is nonhealing skin breakdown related to an ill-fitting socket. Osseointegration may offer benefits for select patients but carries significant risks including infection, implant failure, and bone fracture, and is treated as investigational or requiring special consideration.

    The policy references NICE and recent guideline positions indicating that intraosseous transcutaneous implant procedures (osseointegration) should currently be performed only under special arrangements for clinical governance, consent, and audit or research. Guideline summaries emphasize limited quality evidence and document notable complication risks, supporting the policy’s cautious stance.

    Recent policy revisions clarify that prosthetics not intended for performance of activities of daily living are not medically necessary. The update also highlights investigational classifications for osseointegrated systems, myoelectric partial-hand devices, and enhanced-dexterity upper-limb prostheses. These revisions align coverage with functional need and available evidence.

    The policy reiterates that back-up devices, prostheses whose primary purpose is for leisure or sport rather than ADLs, and devices used primarily for cosmetic reasons are not medically necessary. This rule should be applied when evaluating requests that propose additional or specialty prostheses beyond those required for daily function.

    The policy explicitly states that prosthetic devices intended for individuals with functional level 0 are not medically necessary. Coverage determinations should reference the member’s documented K-level when assessing eligibility.

    Requests for lower limb prosthetic devices for members classified as functional level 0 should be considered not medically necessary and managed accordingly per the policy.

    A microprocessor-controlled ankle-foot prosthesis with an integrated power assist component (combination of L5973 and L5969, e.g., PowerFoot BiOM) is listed in the policy as not medically necessary. Such powered ankle-foot systems are therefore excluded from routine coverage.

    Replacement of a properly functioning external prosthetic device, its components, or accessories solely for the purpose of upgrading to advanced technology or for improved aesthetics is considered not medically necessary and is not covered.

    The policy does not include explicit not-medically-necessary statements for every advanced device in the excerpt, but it highlights limited evidence for some advanced myoelectric systems and powered ankle devices. Where evidence is insufficient or devices are classified investigational, routine coverage is not supported without clear documentation of individualized clinical need.

    Several HCPCS L-codes are specifically flagged as Experimental/Investigational (E/I) in the policy code list (for example, L5991 for osseointegrated connectors and L6026 for certain powered partial-hand prostheses). Codes designated E/I indicate services that are considered investigational and are subject to noncoverage.

    The policy was revised to clarify that prosthetics not used for performance of ADLs are not medically necessary. It also updated statements on osseointegration and classified certain advanced upper-limb devices, including myoelectric partial-hand and enhanced-dexterity systems, as investigational. These edits reflect the policy’s emphasis on functional need and available evidence when determining coverage.

    Coding

    Lower Extremity HCPCS Codes (examples)HCPCSCovered
    L5970Solid-ankle cushioned-heel (SACH) foot
    L5974Single axis ankle/foot
    L5972Flexible-keel foot
    L5978Multi-axial ankle/foot
    L5976Energy storing foot
    L5979Dynamic response foot with multi-axial ankle
    L5980Flex foot system
    L5981Flexwalk system or equal
    L5987Shank foot system with vertical loading pylon
    Covered HCPCS foot/terminal device codesHCPCSCovered
    L5972Flexible-keel foot
    L5978Multi-axial ankle/foot
    L5976Energy storing foot
    L5979Dynamic response foot with multi-axial ankle
    L5980Flex foot system
    L5981Flexwalk system or equal
    L5987Shank foot system with vertical loading pylon
    L3250Prosthetic shoe as a terminal device
    Covered HCPCS knee prosthesisHCPCSCovered
    L5856Microprocessor-controlled knee prosthesis (example)
    Covered HCPCS exampleHCPCSCovered
    L5973Microprocessor-controlled ankle-foot prosthesis (example: Proprio Foot, Ossur)
    Not Medically Necessary HCPCS ExamplesHCPCSNot Covered
    L5973microprocessor-controlled ankle-foot component (mentioned in combination)
    L5969power assist component (mentioned in combination)
    Specified HCPCS code exampleHCPCSCovered
    V2624Polishing and resurfacing of an eye prosthesis
    Lower limb prosthetic HCPCS (excerpt)HCPCS
    L3250Orthopedic footwear, custom molded shoe, removable inner mold, prosthetic shoe, each.
    L5000-L5855Lower limb prosthetic (code range).
    L5615Addition, endoskeletal knee-shin system, 4 bar linkage or multiaxial, fluid swing and stance phase control.
    L5827Endoskeletal knee-shin system, single axis, electromechanical swing and stance phase control, with or without shock absorption and stance extension damping.
    Microprocessor-controlled and osseointegration HCPCSHCPCS
    L5856Addition to lower extremity prosthesis, endoskeletal knee-shin system, microprocessor control knee feature, swing, and stance phase, includes electronic sensor(s), any type.
    L5857Addition to lower extremity prosthesis, endoskeletal knee-shin system, microprocessor control feature, swing phase only, includes electronic sensor(s), any type.
    L5858Addition to lower extremity prosthesis, microprocessor control feature, stance phase only, includes electronic sensor(s), any type.
    L5859Addition to lower extremity prosthesis and programmable flexion/extension assist control, includes any type motor(s).
    L5991Addition to lower extremity prostheses, osseointegrated external prosthetic.
    Upper limb / partial hand HCPCSHCPCS
    L6026Upper limb prosthetic device (code range) Transcarpal/metacarpal or partial hand disarticulation prosthesis, external power, self-suspended, inner socket with removable forearm section, electrodes, and cables, two batteries, charger, myoelectric control of terminal device, excludes terminal device(s) (E/I).
    L6029Upper extremity addition, test socket/interface, partial hand including fingers.
    L6030Upper extremity addition, external frame, partial hand including fingers.
    L6031Replacement socket/interface, partial hand including fingers, molded to patient.
    HCPCS Misc & lower limb examplesHCPCS
    A4361-A4437Ostomy supplies (code range)
    A5051-A5093Additional ostomy supplies (code range)
    A9282Wig, any type, each
    L3250Orthopedic footwear, custom molded shoe, removable inner mold, prosthetic shoe, each
    L5000-L5855Lower limb prosthetic (code range)
    L5615Addition, endoskeletal knee-shin system, 4 bar linkage or multiaxial, fluid swing and stance phase control
    L5827Endoskeletal knee-shin system, single axis, electromechanical swing and stance phase control, with or without shock absorption and stance extension damping
    Microprocessor & osseointegration codesHCPCS
    L5856Addition to lower extremity prosthesis, endoskeletal knee-shin system, microprocessor control knee feature, swing, and stance phase, includes electronic sensor(s), any type
    L5857Addition to lower extremity prosthesis, endoskeletal knee-shin system, microprocessor control feature, swing phase only, includes electronic sensor(s), any type
    L5858Addition to lower extremity prosthesis, microprocessor control feature, stance phase only, includes electronic sensor(s), any type
    L5859Addition to lower extremity prosthesis, programmable flexion/extension assist control, includes any type motor(s)
    L5991 (E/I)Addition to lower extremity prostheses, osseointegrated external prosthetic connector
    L6026 (E/I)Upper limb prosthetic device (code range) Transcarpal/metacarpal or partial hand disarticulation prosthesis, external power, self-suspended, inner socket with removable forearm section, electrodes, cables, two batteries, charger, myoelectric control of terminal device
    Upper limb, terminal device, accessories, repair and general prosthesis codesHCPCS
    L6029Upper extremity addition, test socket/interface, partial hand including fingers
    L6030Upper extremity addition, external frame, partial hand including fingers
    L6031Replacement socket/interface, partial hand including fingers, molded to patient
    L6032Addition to upper extremity prosthesis, partial hand including fingers, ultralight material
    L6033Addition to upper extremity prosthesis, partial hand including fingers, acrylic material
    L6034Partial hand, finger, and thumb prosthesis without prosthetic digit(s)/thumb, amputation at transmetacarpal level, molded to patient model, for use without external power
    L6035Single prosthetic digit, mechanical, initial issue or replacement
    L6036Prosthetic thumb, mechanical, initial issue or replacement
    L6037Immediate post-surgical or early fitting, application of initial rigid dressing, partial hand including fingers
    L6038Addition to single prosthetic digit or thumb, mechanical, multiaxial/internal/external rotation mechanism
    1–10 of 34
    1/4
    ICD10 CodesICD-10
    ICD-10Multiple diagnosis codes referenced; specific codes not listed in these chunks
    Functional level thresholds — Components mapped to functional levels
    Level 1+Basic knees (single-axis/constant friction) and SACH or single-axis feet are appropriate for functional level ≥1.
    Level 2+Flexible-keel feet (L5972) or multi-axial ankle/foot (L5978) are appropriate for functional level ≥2.
    Level 3+Fluid or pneumatic knees and energy-storing/dynamic response feet (e.g., L5976, L5979, L5980, L5981, L5987) are appropriate for functional level ≥3.
    Level 4High-activity knee control frames and components intended for high-impact/athletic ambulation are appropriate for functional level 4.
    Sockets per prosthesis
    Sockets per prosthesisOne (1) socket is allowed per individual prosthetic.
    Socket insertsUp to two (2) identical socket inserts per individual prosthesis may be provided at the same time.
    Test socketsUp to two (2) test sockets are allowed when fitting a socket; test sockets not recommended for immediate postsurgical or early fitting prostheses.
    Minimum expected duration of need
    Minimum expected duration of need>= 90 days (device must be needed for at least 90 days to be eligible for coverage)
    Documentation tie-inRequests should document that the device is needed for the minimum duration as part of required clinical justification.
    Repair/replacement relevanceReplacement or repair decisions reference functional need duration when assessing medical necessity.
    Follow-up duration threshold reported
    OPRA cohort follow-up10 years (Hagberg 2022 prospective cohort of OPRA system reported 10-year follow-up outcomes)
    Study contextOPRA data used to describe long-term patient-reported outcomes and complications over a decade.
    ImplicationLong-term follow-up (10 years) noted in evidence summaries for osseointegration outcomes and risks.

    Provider Actions & Prior Authorization

    Prior Authorization

    Prior authorization tied to device and functional level

    Prior authorization is required for external prosthetic devices; requests should identify the specific HCPCS L-code(s) and document how the requested component aligns with the member's functional (K-) level and medical necessity.

    • Include HCPCS L-code and narrative, brand/make/model, and features on prior auth request.
    • Document the member's functional level (K-level) and which components are appropriate for that level.
    Prior Authorization

    Prior authorization for microprocessor knee

    Obtain prior authorization for microprocessor-controlled knee components (e.g., L5856) and document that ALL microprocessor knee medical necessity criteria are met.

    • Confirm amputation level (knee disarticulation or transfemoral).
    • Document functional level ≥3 and that lower-level devices are insufficient.
    • Provide functional evaluation and evidence of training and cognitive ability.
    Prior Authorization

    Prior authorization for L5973

    Prior authorization is required when requesting microprocessor-controlled ankle-foot prosthesis L5973; include documentation that all listed medical appropriateness criteria for L5973 are met.

    • Document transtibial amputation and functional level ≥3.
    • Show lower-level devices are insufficient and provide functional evaluation and training evidence.
    Prior Authorization

    Myoelectric upper arm components — prior authorization

    When requesting myoelectric upper-arm components, prior authorization is required and the request must document that standard body-powered prostheses cannot be used or are insufficient.

    • Include functional evaluation demonstrating likely benefit with training.
    • Document residual musculature microvolt thresholds and absence of interfering comorbidities when applicable.
    Prior Authorization

    Request type must be specified

    Specify the request type on submissions—whether the device is initial, replacement, preparatory, definitive, or an upgrade—and provide supporting documentation for that classification.

    • If preparatory, document expected temporary use while residual limb remolds (typically 3–6 months).
    • If replacement, document nonrepairability or change in patient condition as applicable.
    Prior Authorization

    Prior auth for advanced/implantable systems

    Prior authorization is appropriate for advanced or implantable systems (e.g., osseointegration, complex myoelectric systems) due to multi‑stage surgeries and prolonged rehabilitation; submit full surgical and rehabilitation plan in the request.

    • For osseointegration (OPRA), include plan for staged surgeries, anticipated rehabilitation timeline, and justification that socket prostheses are insufficient.
    • Note that some advanced technologies may be investigational and require additional review.
    Prior Authorization

    Prior authorization for listed HCPCS codes

    Obtain prior authorization for the specific HCPCS prosthetic component codes listed in the policy when billing those codes; include the HCPCS code(s) and product details in the documentation.

    • Include the exact HCPCS L-code(s) (e.g., L5615, L5856, L5991) and the device brand/make/model on the prior authorization and claim.
    • Codes flagged E/I or NMN require supporting justification or may be denied per code designation.
    Prior Authorization

    Prior authorization follows product coverage

    Confirm coverage/PA requirements follow the member's product contract: services are contract dependent and prior authorization requirements follow product coverage rules.

    • If the member's product excludes a service, policy criteria do not apply and the request may be denied.
    • If product covers the service, apply medical policy criteria when submitting prior authorization.
    Documentation Required

    Preparatory prosthesis sequencing

    When requesting a preparatory prosthesis, document that it is temporary post‑surgical equipment intended to prevent residual‑limb edema and support recovery; avoid requesting higher‑end components reserved for definitive devices.

    • State expected preparatory duration (typically 3–6 months) and that advanced components (e.g., microprocessor knees, energy‑storing feet) are not medically necessary for preparatory devices.
    • Provide plan for transition to definitive prosthesis once limb volume stabilizes.
    Step Therapy

    Step requirement before microprocessor knee

    Before approving a microprocessor-controlled knee, document that lower-level prosthetic devices (e.g., fluid, pneumatic systems) were tried and found insufficient to meet the individual's ADL functional needs.

    • Provide prior device types, dates of use, and reasons they were insufficient.
    • Include functional evaluation showing anticipated benefit from a microprocessor knee.
    Documentation Required

    Lower-level device insufficiency

    Document that lower-level prosthetic devices are insufficient or cannot be used before requesting higher‑level components (e.g., microprocessor knee/ankle); explicit evidence of insufficiency is required.

    • Describe prior component(s) and objective/subjective failure to meet ambulation or ADL needs.
    • Include functional testing results or clinician assessment explaining insufficiency.
    Step Therapy

    Myoelectric components sequencing

    For myoelectric upper extremity requests, demonstrate that conventional body‑powered prostheses are insufficient before myoelectric components are approved.

    • Provide prior body‑powered device trials and outcomes.
    • Include functional evaluation predicting benefits of myoelectric control with training.
    Documentation Required

    Repair vs Replacement requirements

    For repair requests, document that repair is expected to restore full function per the manufacturer; for replacements, document device is nonrepairable or repair cost exceeds replacement cost or that patient's condition has changed.

    • Include physician attestation, date of implantation/initiation, and manufacturer warranty information.
    • Document how inadequate function interferes with activities of daily living.
    Documentation Required

    Socket suspension sequencing

    Consider standard suction or other suspension methods before requesting vacuum‑assisted socket systems (VASS); document that standard options are inadequate when requesting VASS.

    • If requesting VASS, provide evidence of nonhealing stump skin breakdown or that the current socket cannot be modified to secure the limb.
    • Document attempts at other suspension options and reasons for failure.
    Step Therapy

    No explicit step therapy requirements

    No formal step therapy program is specified in this policy section; however, clinical criteria require trials of lower-level devices before some advanced components are approved.

    • Policy notes no explicit step therapy requirements but requires documentation that lower-level devices are insufficient for microprocessor components.
    Documentation Required

    Required clinical justification

    Provide clinical justification showing the prosthetic replaces all or part of an internal organ or restores function of a permanently inoperative or malfunctioning body part, and that supplies requested are necessary to make the prosthesis functional.

    • Include description of supplies needed (e.g., ostomy supplies, tracheostomy kits, batteries) and why they are required for function.
    Documentation Required

    Training and cognitive ability

    Document that the patient has received device‑specific training and has adequate cognitive ability to master use and care requirements for advanced prosthetic devices.

    • Include details of training provided, dates, and clinician assessment of patient cognitive/behavioral capacity.
    • State whether additional rehabilitation is planned and expected patient participation.
    Documentation Required

    Functional need documentation

    Document functional need: show the patient requires long‑distance ambulation at variable rates, frequent ambulation on uneven terrain, and frequent ambulation on stairs or ramps to justify microprocessor knees/ankles.

    • Provide functional testing or activity‑level reports supporting these needs.
    • Include how device use will impact ADLs, vocational or community mobility demands.
    Documentation Required

    Functional evaluation

    Submit a functional evaluation demonstrating that with training a microprocessor knee or ankle is likely to meet the individual's needs.

    • Include objective measures and clinician interpretation forecasting benefit after training.
    • For ankle-foot (L5973), provide transtibial‑level specific evaluation results.
    Documentation Required

    Physician documentation must include dates, warranty, attestations

    Physician documentation must include date of device implantation/initialization, manufacturer warranty information (if applicable), and attestation of patient compliance and ongoing benefit.

    • For repairs/replacements include documentation that device no longer functions adequately and that inadequate function interferes with ADLs.
    • For replacements, document nonrepairability or that repair cost exceeds replacement cost when applicable.
    Documentation Required

    Documentation must show the device is no longer functioning adequately

    Documentation for repair requests must show the device is no longer functioning adequately, that inadequate function interferes with ADLs, and that repair is expected to restore full function as defined by the manufacturer.

    • Include manufacturer repair estimate or statement that repair will restore function.
    • Attach clinical notes describing how device malfunction affects daily activities.
    Documentation Required

    Required Documentation

    Required documentation for prior authorization and claims: general device description with HCPCS code and narrative, brand/make/model/features, ordered options/accessories with quantities, request type (initial/replacement/preparatory/definitive/upgrade), and documentation that device is needed for at least 90 days.

    • Include HCPCS L-code product descriptions on claims to identify the specific product.
    • State minimum expected duration of need (≥90 days) and supply supporting evidence.
    Documentation Required

    State-specific documentation note

    State‑specific note: For New York, coverage of ostomy equipment and supplies is required when prescribed by an authorized prescriber, subject to applicable cost‑sharing.

    • Include prescriber credentials where applicable to meet NY requirements.
    Documentation Required

    Preparatory vs definitive prosthesis documentation

    When requesting a preparatory versus definitive prosthesis, document that preparatory devices are used while the residual limb remolds (typically 3–6 months) and that definitive devices are fitted after limb stabilization (socket fit consistent for 2–3 weeks).

    • Provide timeline and plan for transition from preparatory to definitive device.
    • Avoid requesting advanced nonstandard additions for preparatory prostheses per policy.
    Billing Rule

    Coding and documentation guidance

    Include specific HCPCS L-codes and product descriptions on claims and prior authorization submissions; code lists in the policy may not be exhaustive so include brand/model to identify the billed product.

    • If submitting codes marked E/I or NMN, provide clinical justification or note they may be considered investigational/not medically necessary.
    • Use the policy's HCPCS lists as guidance and include device identifiers on documentation.
    Billing Rule

    Coding documentation

    On claims and supporting documentation include the specific HCPCS L-code product description (L-code) and brand/make/model to clearly identify the prosthetic device or component billed.

    • Providing detailed HCPCS and device descriptors reduces risk of processing delays or denials.
    • Attach product spec sheets when available.
    Documentation Required

    Preparatory prosthesis sequencing

    When proposing sequencing of preparatory prostheses, demonstrate that lower‑level devices were used and found insufficient before higher‑level components are requested for the definitive prosthesis.

    • Document prior preparatory device use and timing relative to residual limb healing.
    • Explain why higher‑end components are reserved for definitive devices and not appropriate during preparatory phase.
    Denial Risk

    Lower-level device insufficiency (denial risk)

    Document that lower‑level devices were insufficient before requesting higher‑level microprocessor or energy‑storing components; absence of such documentation is a denial risk.

    • Provide details of prior device trials, duration, and objective/subjective outcomes.
    • Without evidence of insufficiency, microprocessor device requests may be denied.
    Documentation Required

    Providers should demonstrate body-powered insufficiency before myoelectric

    Providers should demonstrate that conventional body‑powered upper‑extremity prostheses are insufficient before requesting myoelectric components; lack of such demonstration may lead to denial.

    • Include documentation of prior body‑powered device trials and reasons for inadequacy.
    • Functional evaluation predicting benefit from myoelectric device is required.
    Denial Risk

    Repair of equipment damaged due to patient neglect or alternate coverage

    Repair requests for devices damaged due to patient neglect, theft, or abuse, or where another payer (e.g., homeowners, auto, rental, liability) is available, are ineligible and may be denied.

    • If alternative coverage exists, identify that source on the submission or the request may be denied.
    • Repairs for neglect/abuse/theft are not covered under this policy.
    Denial Risk

    Damage/Loss from Neglect or Alternative Coverage

    Repair or replacement for damage or loss due to patient neglect, theft, or abuse, or when another coverage source exists, is not covered and will be denied.

    • Document if any other payer is responsible; absence of such documentation may trigger denial.
    Denial Risk

    Coverage-coded denial risk (E/I or NMN codes)

    Codes designated (E/I) Experimental/Investigational or (NMN) Not Medically Necessary in the policy may be denied or require additional justification; verify code status and include supporting clinical evidence when submitting.

    • If submitting codes flagged E/I (e.g., L5991, L6026), include strong clinical rationale or note they may be considered investigational.
    • Policy states codes may not be covered under all circumstances—verify prior to submission.
    Note

    Contract-dependent coverage

    Services are contract dependent; verify the member's product coverage before submitting prior authorization—lack of product coverage may result in denial despite meeting policy criteria.

    • If product excludes the service, medical policy criteria do not apply and the request will not be approved.
    • For Medicare/Medicaid products, follow the product‑specific coverage guidance as noted in the policy.
    Documentation Required

    Training and cognitive ability (documentation requirement)

    Demonstrate the patient has adequate training and cognitive ability to master use and care of advanced devices; include documentation of training sessions and clinician assessment.

    • For L5973 and microprocessor knees, include training documentation specific to device operation and maintenance.
    • State expected ongoing support and rehabilitation plans.
    Denial Risk

    Microprocessor contraindications and denial triggers

    Microprocessor knee/ankle requests may be denied if contraindications exist—functional level <3, poor balance/ataxia, inability to tolerate weight, significant hip flexion contracture >20°, significant deformity, or use in environments that invalidate warranty.

    • Assess and document absence of listed contraindications when requesting microprocessor components.
    • If any contraindication is present, do not request microprocessor components as approval is unlikely.
    Denial Risk

    Weight and environmental contraindications (denial risk)

    Requests will be at risk of denial if the patient cannot tolerate the prosthesis weight or intends to use the device in environments (excessive moisture/dust) that would invalidate the device warranty.

    • Document weight tolerance testing or clinician assessment when weight is a concern.
    • If environmental use would invalidate warranty, include mitigation or alternative solutions.
    Prior Authorization

    Vacuum-assisted socket systems (VASS) — approval conditions

    Vacuum‑assisted socket systems (VASS) lack evidence of superiority for all patients; prior authorization for VASS should include documentation that standard socket modifications are inadequate or there is non‑healing skin breakdown.

    • Provide prior socket modification attempts and clinical rationale for VASS.
    • VASS is appropriate only when documented indications are met; otherwise request may be denied.
    Denial Risk

    Preparatory device advanced additions — denial risk

    Preparatory prostheses should not include advanced nonstandard additions (protective covers, ultralight materials, microprocessor knees, energy‑storing components); requests including such additions for preparatory devices risk denial.

    • If advanced components are required, justify why a definitive device is not appropriate or why preparatory restrictions should be waived.
    Note

    Background

    External prosthetic devices are intended to replace all or part of an internal organ or to restore the function of a permanently inoperative or malfunctioning body part. Coverage is limited to devices and related supplies that are medically necessary to restore function; supplies required to make the prosthesis functional (for example, ostomy supplies, tracheostomy kits, or batteries) are included when the prosthetic device itself meets medical necessity criteria.

    Definitions

    Preparatory prosthesis — temporary prosthesis definition and sequencing
    DefinitionPreparatory prosthesis: a temporary prosthesis provided after surgery to prevent residual limb edema and enhance functional recovery.
    Typical timingUsed while the residual limb remolds, typically for 3–6 months until final shape and size are reached.
    SequencingA definitive (permanent) prosthesis is fitted after residual limb volume stabilizes (socket fit consistent for 2–3 weeks).
    Functional level — Graded activity/function classification (levels 1–4)
    DefinitionFunctional level: graded activity/function classification (Levels 0–4) used to determine appropriate prosthetic components.
    Level 0No ability or potential to ambulate or transfer safely; prosthesis does not enhance mobility or quality of life.
    Level 1–4 scaleLevel 1: transfers/ambulation on level surfaces; Level 2: traverse low-level environmental barriers; Level 3: variable cadence community ambulator; Level 4: high-activity/athlete.
    Functional level 1/2/3 — Specific component examples tied to functional levels
    Examples for Level 1Single-axis knees and SACH/single-axis feet (e.g., L5970, L5974) are examples tied to lower functional levels.
    Examples for Level 2Flexible-keel foot (L5972) or multi-axial ankle/foot (L5978) are examples appropriate for functional level ≥2.
    Examples for Level 3Energy-storing feet and dynamic response/flex foot systems (L5976, L5979, L5980, L5981, L5987) are tied to functional level ≥3.
    Vacuum-assisted socket system (VASS) definition — When considered appropriate
    VASS definitionVacuum-assisted socket system (VASS): a socket suspension system using vacuum to improve suspension and fit.
    Appropriate indicationsConsidered appropriate when there is nonhealing skin breakdown on the stump from friction due to an ill-fitting socket, or when the current socket can no longer be modified to adequately secure the limb.
    Evidence notePolicy notes limited evidence of superiority for VASS and recommends standard suspension options first when clinically feasible.
    Functional level 3 — Community-ambulating mobility level definition
    DefinitionFunctional level 3: ability or potential for ambulation with variable cadence; typical community ambulator who can traverse most environmental barriers and may have vocational/therapeutic/exercise activity demands.
    Component implicationFunctional level 3 is the minimum for consideration of microprocessor-controlled ankle-foot prosthesis (L5973) and many fluid/pneumatic knees.
    Clinical expectationPatients at level 3 require regular/frequent ambulation on uneven terrain and stairs/ramps; functional evaluation should predict benefit from advanced components.
    Myoelectric upper arm prosthetic components — Definition and coverage preconditions
    DefinitionMyoelectric upper arm prosthetic components: devices that use electrical signals from residual musculature to control prosthesis movements.
    Coverage preconditionsCoverage requires that standard body-powered devices are insufficient, residual musculature meets minimum microvolt thresholds, and no comorbidities interfere with device function.
    Functional evaluation requirementFunctional evaluation must indicate that with training, a myoelectric prosthesis is likely to meet the individual's ADL needs considering control, durability, and usability.
    External prosthetic devices — General definition and examples
    DefinitionExternal prosthetic devices: worn anatomic supplements used to replace nonfunctioning or absent body parts (examples: artificial limbs, removable artificial eyes, external breast prostheses, external pacemakers, electronic speech aids).
    ExamplesIncludes lower- and upper-limb prostheses, prosthetic socks, sockets, liners, and related accessories needed to make the device functional.
    Coverage contextDevices are assessed by functional need, duration of need, and device-specific medical necessity criteria in the policy.
    Lower limb prosthetic functional levels 0-2 — Level descriptions
    Level 0No ability or potential to ambulate or transfer safely; prosthesis does not enhance mobility or quality of life.
    Level 1Ability/potential to use a prosthesis for transfers or ambulation on level surfaces at a fixed cadence (household ambulator).
    Level 2Ability/potential for ambulation with ability to traverse low-level environmental barriers (limited community ambulator).
    Preparatory (temporary) lower-limb prosthesis — Definition and typical duration
    DefinitionPreparatory (temporary) lower-limb prosthesis: a temporary device fitted while the residual limb is remolding after surgery.
    Typical durationTypically used until residual limb reaches final shape and size, usually within 3–6 months.
    PurposePrevents edema and supports functional recovery; advanced nonstandard components are not appropriate for preparatory devices.
    Definitive (permanent) lower-limb prosthesis — Definition and criteria for fitting
    DefinitionDefinitive (permanent) lower-limb prosthesis: a permanent prosthesis fitted after residual limb volume stabilizes and socket fit is consistent for 2–3 weeks.
    Fitting criteriaFitted once residual limb is stable (volume unchanged and consistent socket fit) following the preparatory period.
    Core componentsA definitive lower-limb prosthesis typically includes socket, suspension mechanism, knee joint, pylon, and terminal device (foot).
    Osseointegration (OPRA) — Definition and indication when socket prostheses are not tolerated
    Osseointegration (OPRA) definitionOsseointegration (OPRA): an implant system for direct skeletal anchorage of a prosthesis intended for skeletally mature individuals when socket prostheses are insufficient.
    IndicationConsidered for patients who cannot tolerate socket prostheses or have failed socket rehabilitation; involves multi-stage surgery and prolonged rehabilitation.
    Risks and evidenceObservational studies report mobility and QOL improvements but also significant risks (infection, implant failure, revisions); evidence limited and long-term safety not fully established.
    Powered microprocessor-controlled ankle-foot prosthesis — Definition and intended function
    DefinitionPowered microprocessor-controlled ankle-foot prosthesis: an externally powered ankle-foot device with microprocessor control intended to actively assist dorsiflexion/plantarflexion and modulate ankle mechanics during gait.
    Intended functionDesigned to assist push-off and adapt ankle mechanics across gait phases; clinical trials show inconsistent objective improvements (metabolic cost, walking speed) though subjective benefits reported for some users.
    Coverage considerationEvidence is limited and benefits vary by functional level (K-level); consider individual patient factors when assessing medical necessity.
    Myoelectric multi-grip hand / partial hand prosthesis — Definition and evidence note
    DefinitionMyoelectric multi-grip hand / partial hand prosthesis: externally powered upper-limb prosthetic hands with multiple articulating digits or grips controlled by myoelectric signals.
    Evidence noteStudies report mixed outcomes; some partial-hand users show objective functional improvements, but overall evidence limited by small samples and device heterogeneity.
    Coverage implicationDurability concerns and lack of randomized comparative trials limit routine coverage absent demonstrated functional need.
    Osseointegration (OI) / Transcutaneous osseointegrated prosthesis — Definition and intent
    DefinitionOsseointegration (OI) / Transcutaneous osseointegrated prosthesis: direct skeletal attachment of a prosthesis via an intraosseous transcutaneous implant (e.g., OPRA).
    IntentIntended to improve mechanical transfer, reduce socket-related skin issues, and enhance mobility for select patients who cannot tolerate sockets.
    Evidence and riskEvidence largely observational with improved PROs but significant complication rates (infections, osteomyelitis, neuromas, mechanical failures) and need for specialized governance or research arrangements noted by guideline bodies.
    HCPCS L-codes — Definition of coding system used throughout policy
    DefinitionHCPCS L-codes: Healthcare Common Procedure Coding System codes used to identify prosthetic devices, components, additions, and accessories referenced throughout the policy.
    UsageSpecific L-code examples (e.g., L5970, L5972, L5856, L5973) are cited to map components to functional levels and prior authorization requirements.
    Coding guidancePolicy includes code lists and notes that code lists may not be all inclusive; providers should include HCPCS codes and device descriptors in documentation.

    Revision History

    2026-04-16Committee Approval / Annual ReviewLatest

    Committee approval and annual review recorded on 04/16/26 per policy history.

    2025-04-17Annual Review

    Annual review with policy statement added clarifying prosthetics not for activities of daily living are not medically necessary and classifying osseointegrated, myoelectric partial hand, and enhanced dexterity upper-limb prosthetic devices as investigational; HCPCS code updates noted.

    2025-01-01Policy Revision / Code Update

    Guidelines and code edits implemented with addition of HCPCS L5991 and summary-of-changes tracking; policy intent unchanged.

    2024-02-22Committee Approval / Annual Review

    Committee approval and annual review recorded on 02/22/24 per policy history entries.

    2023-02-16Committee Approval / Annual Review

    Committee approval and annual review recorded on 02/16/23 per policy history entries.

    2022-02-17Committee Approval / Annual Review

    Committee approval and annual review recorded on 02/17/22 per policy history entries.

    2021-02-25Committee Approval / Annual Review

    Committee approval and annual review recorded on 02/25/21 per policy history entries.

    2020-02-27Committee Approval / Annual Review

    Committee approval and annual review recorded on 02/27/20 per policy history entries.

    2019-02-28Committee Approval / Annual Review

    Committee approval and annual review recorded on 02/28/19 per policy history entries.

    2018-02-22Committee Approval / Annual Review

    Committee approval and annual review recorded on 02/22/18 per policy history entries.

    2017-02-16Committee Approval / Annual Review

    Committee approval and annual review recorded on 02/16/17 per policy history entries.

    2016-02-25Committee Approval / Annual Review

    Committee approval and annual review recorded on 02/25/16 per policy history entries.

    2015-02-26Committee Approval / Annual Review

    Committee approval and annual review recorded on 02/26/15 per policy history entries.

    2014-06-26Committee Approval

    Committee approval recorded on 06/26/14 per policy history entries.

    2013-06-27Committee Approval

    Committee approval recorded on 06/27/13 per policy history entries.

    2012-08-23Committee Approval

    Committee approval recorded on 08/23/12 per policy history entries.

    2011-06-24Committee Approval

    Committee approval recorded on 06/24/11 per policy history entries.

    2010-02-25Committee Approval

    Committee approval recorded on 02/25/10 per policy history entries.

    2009-02-26Committee Approval

    Committee approval recorded on 02/26/09 per policy history entries.

    2007-04-26Committee Approval

    Committee approval recorded on 04/26/07 per policy history entries.

    2006-04-27Committee Approval

    Committee approval recorded on 04/27/06 per policy history entries.

    2005-04-28Committee Approval

    Committee approval recorded on 04/28/05 per policy history entries.

    2004-05-27Committee Approval

    Committee approval recorded on 05/27/04 per policy history entries.

    2003-10-23Committee Approval

    Committee approval recorded on 10/23/03 per policy history entries.

    2002-07-25Original Effective Date / Committee Approval

    Original effective date and initial committee approval recorded on 07/25/02.