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    v1.0.28
    OpenPayerBilling CodesProsthetic ProceduresHCPCS hcpcs-l6688-upper-extremity-frame-socket-above-elbow
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    HCPCS L6688: Upper Extremity Frame-Type Socket, Above Elbow

    HCPCS Level II code L6688 describes an upper extremity addition, frame type socket, for above-elbow or elbow disarticulation prosthetic devices; the service represents fabrication and fitting of a frame-type prosthetic socket for an upper limb amputation at or above the elbow, classified as a prosthetic device service typically provided in orthotics/prosthetics clinics, prosthetic fabrication labs, or outpatient rehabilitation settings.

    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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    Clinical & Coding Specifications

    Clinical Context

    A 48-year-old male who underwent a traumatic above-elbow amputation following a motor vehicle collision presents to a multidisciplinary prosthetics clinic for fabrication of an upper-limb socket. The patient has an amputation level at the distal humerus (above elbow) and requires a custom frame-type socket to interface with a transhumeral prosthetic suspension system. The clinical workflow includes an initial prosthetist evaluation and residual limb assessment, measurement and casting or digital scan of the residual limb, design review with the patient to select suspension and terminal device compatibility, fabrication of the frame-type socket (including modifications for soft-tissue relief and weight distribution), multiple fit and alignment visits for dynamic testing and adjustments, and final delivery with gait/functional training and documentation of patient-reported outcomes.

    Typical site of service is an outpatient prosthetics clinic or orthotics and prosthetics facility with occasional pre- or post-procedure visits in a hospital outpatient department for complex cases or multidisciplinary evaluations. Key team members include a certified prosthetist, occupational therapist or physical therapist for training, and the referring orthopedic or plastic surgeon for complex residual-limb issues.

    Related CPT Codes

    CPT CodeDescriptionRelationship to This Procedure
    97760Orthotic(s) management and training; initial encounter, each 15 minutesUsed for patient training and education in the use of the new above-elbow prosthetic socket and associated components during initial fitting sessions.
    97763Orthotic(s)/prosthetic(s) management and training, initial encounterApplied for comprehensive training in donning/doffing, skin checks, and functional training specific to the new frame-type socket.
    99070Supplies and materials (e.g., bandages, splints), noncovered items, used during patient careUsed to report additional non-covered supplies or minor items used during fabrication or fitting not included in the HCPCS allowance.
    99080Special reports such as insurance forms, more than the usual documentationUsed when payers require extra documentation beyond standard clinical notes for prosthetic authorization.
    97605Debridement, open wound, (if applicable)Only relevant if significant residual-limb wound management is required prior to fitting; included as an occasionally associated procedure.

    If additional facility or surgical CPT codes are required for residual-limb revision or bone/soft-tissue procedures prior to prosthetic fitting, those are documented separately by the surgical team; the table above lists commonly billed outpatient rehabilitation and supply codes associated with prosthetic delivery.

    Related Modifiers

    6 rows

    ModifierDescriptionWhen to Use
    22Modifier –22 (Increased Procedural Services) is used when a reported procedure is substantially more extensive than normally required. The CPT Manual and CMS state it may be appended only when the…- When to use: Append modifier -22 to a procedural CPT code when the service performed is substantially more extensive than the usual service described by that code — i.e., the procedure required…
    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…
    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…
    80CPT® Modifier 80 (Assistant Surgeon) is appended to a surgical CPT code when a physician (MD or DO) provides full, continuous assistance throughout the operative procedure. It is intended only for…- Use CPT Modifier -80 when a physician (MD or DO) serves as an assistant surgeon and provides full, continuous assistance throughout the entire operative procedure; append -80 to the surgical CPT…
    62Modifier 62 indicates that two surgeons function as co‑surgeons, each performing distinct parts of the same primary surgical procedure. It is appended to the primary procedure code (and any…- Use modifier -62 when two surgeons act as co‑surgeons (both primary surgeons) on a single definitive primary procedure, each performing distinct parts of the same surgical procedure (append -62 to…

    Related Provider Taxonomies

    8 rows

    Taxonomy CodeSpecialtyNotes
    213E00000XPodiatristA podiatrist is a person qualified by a Doctor of Podiatric Medicine (D.P.M.) degree, licensed by the state, and practicing within the scope of that l…
    225100000XPhysical TherapistPhysical therapists (PTs) are licensed health care professionals who diagnose and treat individuals of all ages, from newborns to the very oldest, who…
    225X00000XOccupational TherapistAn occupational therapist is a person who has graduated from an entry-level occupational therapy program accredited by the Accreditation Council for O…
    2080P0208XPediatric Infectious Diseases PhysicianA pediatrician trained to care for children in the diagnosis, treatment and prevention of infectious diseases. This specialist can apply specific know…
    207ND0101XMOHS-Micrographic Surgery PhysicianThe highly-trained surgeons that perform Mohs Micrographic Surgery are specialists both in dermatology and pathology. With their extensive knowledge o…
    207R00000XInternal Medicine PhysicianA physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults…
    207QA0505XAdult Medicine PhysicianThe NUCC recommends this code not be used. Choose a more appropriate code.
    320900000XIntellectual and/or Developmental Disabilities Community Based Residential Treatment FacilityA home-like residential facility providing habilitation, support and monitoring services to individuals diagnosed with intellectual and/or development…

    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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