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    v1.0.28
    OpenPayerBilling CodesProsthetic ProceduresHCPCS hcpcs-l8470-prosthetic-sock-below-knee-single-ply
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    HCPCS L8470: Prosthetic Sock, Single-Ply, Below Knee

    HCPCS Level II code L8470 describes a single-ply prosthetic sock used for fitting a below-knee (transtibial) prosthesis; this represents a prosthetic sock product provided as part of prosthetic fitting services, typically supplied in an orthotics/prosthetics clinic or prosthetist's office for socket volume management and patient comfort during prosthesis fitting and wear.

    For related coverage guidance, see recent payer policy updates: Clinical Review Criteria — Lymphedema Therapy and Training (Complete Decongestive Therapy; LVA), Therapy Services — Electric Stimulation for Pain, Swelling and Function in a Clinic Setting, Site of Care: Outpatient Hospital Setting for Physical and Occupational Therapy.

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    Table of contents

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    Clinical & Coding Specifications

    Clinical Context

    A 62-year-old male patient with a transtibial (below-knee) amputation presents to a prosthetics clinic for fitting and accommodation of a new limb. The clinician evaluates residual limb volume, skin integrity, and prosthetic socket fit. A single-ply prosthetic sock is selected and fitted to manage minor volume fluctuations and provide a cushioning interface between the limb and socket. The workflow includes wound/skin check, measurement and selection of appropriate sock size and ply, trial donning with the prosthesis, patient education on sock use and wear schedule, and documentation of the fitting session and item dispensed. Billing uses L8470 for the single-ply below-knee prosthetic sock, each, and may be accompanied by modifiers indicating laterality (LT/RT), supplier or place of service, or billing circumstances (e.g., KA/KX style documentation requirements). Typical site of service is an outpatient prosthetics clinic, orthotics and prosthetics (O&P) supplier location, or hospital outpatient prosthetics department. Typical patient scenario includes routine socket accommodation for established prosthesis users or post-amputation patients transitioning from temporary to definitive liner/sock systems.

    Related CPT Codes

    CPT CodeDescriptionRelationship to This Procedure
    97760Orthotic(s) management and training; initial encounter for use of prosthetic or orthotic devicePerformed during initial prosthetic training sessions when a sock is fitted and patient is instructed in use.
    97763Orthotic(s)/prosthetic(s) management and training; subsequent encounterUsed for follow-up training and adjustments after the sock fitting.
    99070Supplies and materials (except spectacles) provided by the physician over and above those usually included with the office visitUsed when non-routine supplies or additional disposable items are furnished during the visit in addition to L8470.
    99401Preventive medicine counseling and/or risk factor reduction interventionMay be used when counseling on skin care, limb hygiene, and sock rotation is billed separately (time-based).
    11055Paring or cutting of benign hyperkeratotic lesion (e.g., callus)...Data not available in the input.

    Related Modifiers

    5 rows

    ModifierDescriptionWhen to Use
    52Modifier ‑52 (Reduced Services) indicates that a service or procedure was partially reduced or omitted at the provider’s discretion, allowing reporting of the basic procedure number with a qualifier…- Use modifier -52 when a physician or qualified health professional electively reduces or omits part of a procedure or service (for example, performing fewer required views or omitting a portion of…
    53Modifier 53 (Discontinued Procedure) signals that a surgical or diagnostic service was begun by the physician but terminated because of extenuating circumstances that threatened the patient’s…- Use modifier -53 when a physician/qualified healthcare professional has started a surgical or diagnostic procedure (e.g., anesthesia administered, incision or scope insertion) and then discontinues…
    59Modifier 59 indicates a distinct procedural service when two procedures that are not normally billed together are clinically and procedurally separate. The CPT definition (as reiterated by CMS)…- Use modifier -59 to report a distinct procedural service when documentation supports that the procedure reported is not normally billed together with another service on the same day because of a…
    78CPT modifier -78 indicates an unplanned, related return to the operating or procedure room by the same provider during the global postoperative period. It is appended when treatment for a…- Use modifier -78 when an unplanned, related complication during the original procedure’s global postoperative period requires the patient to return to a formal operating or procedure room and the…
    26Modifier 26 (Professional Component) identifies and bills only the professional portion of a split service — the physician’s interpretation, report, and medical judgment — when the technical…- Use CPT Modifier -26 when you are billing only the professional component (PC) of a split‑bill eligible service—i.e., you performed the physician interpretation, medical judgment and prepared a…

    Related Provider Taxonomies

    8 rows

    Taxonomy CodeSpecialtyNotes
    333600000XPharmacyA facility used by pharmacists for the compounding and dispensing of medicinal preparations and other associated professional and administrative servi…
    207L00000XAnesthesiology PhysicianAn anesthesiologist is trained to provide pain relief and maintenance, or restoration, of a stable condition during and immediately following an opera…
    261QP2000XPhysical Therapy Clinic/CenterAn entity, facility, or distinct part of a facility providing diagnostic and treatment services related to physical rehabilitation. Physical therapy i…
    207K00000XAllergy & Immunology PhysicianAn allergist-immunologist is trained in evaluation, physical and laboratory diagnosis, and management of disorders involving the immune system. Select…
    2086S0129XVascular Surgery PhysicianA surgeon with expertise in the management of surgical disorders of the blood vessels, excluding the intracranial vessels or the heart.
    207Y00000XOtolaryngology PhysicianAn otolaryngologist-head and neck surgeon provides comprehensive medical and surgical care for patients with diseases and disorders that affect the ea…
    207XS0106XOrthopaedic Hand Surgery PhysicianAn orthopaedic surgeon trained in the investigation, preservation and restoration by medical, surgical and rehabilitative means of all structures of t…
    385HR2055XChild Mental Illness Respite CareA facility or distinct part of a facility that provides short term, residential care to children, diagnosed with mental illness, as respite for the re…

    Related Payer Policy Updates

    Specialty: Physical Medicine, Rehab & Therapies1 / 2

    3 rows

    PolicyPayerEffective Date
    Clinical Review Criteria — Lymphedema Therapy and Training (Complete Decongestive Therapy; LVA)Kaiser Permanente2026-09-01
    Therapy Services — Electric Stimulation for Pain, Swelling and Function in a Clinic SettingCigna2026-08-15
    Site of Care: Outpatient Hospital Setting for Physical and Occupational TherapyCigna2026-08-15

    Related Codes

    HCPCS-L5000-PARTIAL-FOOT-SHOE-INSERT-LONGITUDINAL-ARCH-TOE-FILLER

    HCPCS Level II L5000: Partial Foot Shoe Insert with Longitudinal Arch, Toe Filler

    HCPCS-L5010-PARTIAL-FOOT-MOLDED-SOCKET-ANKLE-HEIGHT-TOE-FILLER

    HCPCS L5010: Partial Foot Molded Socket, Ankle Height, With Toe Filler

    HCPCS-L5020-PARTIAL-FOOT-MOLDED-SOCKET-TIBIAL-TUBERCLE-TOE-FILLER

    HCPCS L5020: Partial Foot Molded Socket with Toe Filler

    HCPCS-L5050-ANKLE-SYMES-MOLDED-SOCKET-SACH-FOOT

    HCPCS L5050: Ankle/Symes Molded Socket with SACH Foot

    HCPCS-L5060-ANKLE-SYMES-METAL-FRAME-MOLDED-LEATHER-SOCKET-ARTICULATED-ANKLE-FOOT

    HCPCS L5060: Ankle/Symes Metal Frame with Molded Leather Socket

    HCPCS-L5100-BELOW-KNEE-MOLDED-SOCKET-SHIN-SACH-FOOT

    HCPCS Level II L5100: Below-Knee Molded Socket with Shin and SACH Foot

    HCPCS-L5105-BELOW-KNEE-PLASTIC-SOCKET-SACH-FOOT

    HCPCS L5105: Below-Knee Plastic Socket Prosthesis with SACH Foot

    HCPCS-L5150-KNEE-DISARTICULATION-MOLDED-SOCKET-EXTERNAL-KNEE-SACH-FOOT

    HCPCS L5150: Knee Disarticulation Molded Socket with External Knee and SACH Foot

    HCPCS-L5160-KNEE-DISARTICULATION-MOLDED-SOCKET-BENT-KNEE-SACH-FOOT

    HCPCS Level II L5160: Knee Disarticulation Molded Socket, Bent Knee Configuration

    HCPCS-L5200-ABOVE-KNEE-MOLDED-SOCKET-SINGLE-AXIS-KNEE-SACH-FOOT

    HCPCS Level II L5200: Above-knee Prosthesis with Molded Socket and Single-axis Knee

    Showing 1–10 of 472

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    Frequently Asked Questions

    References

    1. 1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
    2. 2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
    3. 3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.
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