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    OpenPayerBilling CodesProsthetic ProceduresHCPCS hcpcs-l6621-upper-extremity-prosthesis-wrist-addition-powered-device
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    HCPCS L6621: Upper Extremity Prosthesis Addition, Flexion/Extension Wrist

    HCPCS Level II code L6621 describes an upper extremity prosthesis addition consisting of a flexion/extension wrist, with or without friction, designed for use with an external powered terminal device; this entry represents a durable medical equipment prosthetic component used as part of an upper-limb prosthesis assembly. The service type is prosthetic device component provision and fitting, and the typical site of service is prosthetics/orthotics clinics, outpatient rehabilitation facilities, or specialty prosthetics suppliers where the device is measured, fitted, and adjusted for use with external powered terminal devices.

    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 45-year-old patient with a transradial amputation presents for prosthetic fitting and rehabilitation. The patient will receive an upper-extremity prosthetic addition: a flexion/extension wrist assembly compatible with an externally powered terminal device. The clinical workflow includes prosthetist assessment, measurement and socket verification, selection and trial of the powered wrist unit, integration with the terminal device and harnessing, electrical and mechanical alignment, functional training with an occupational therapist, and follow-up adjustments. Typical encounters include initial ordering and fabrication, a fitting session to attach and align the wrist unit to the existing socket and powered terminal device, adjustment visits for fit and control (programming or cable tensioning if applicable), and routine maintenance or component replacement visits.

    Related CPT Codes

    CPT CodeDescriptionRelationship to This Procedure
    97760Orthotic(s) management and training, upper extremity, initial encounter, each 15 minutesUsed by therapists for training the patient to use the powered wrist and terminal device during fitting visits.
    97763Orthotic(s) management and training, upper extremity, subsequent encounter, each 15 minutesUsed for follow-up training and adjustments after initial fitting.
    99070Supplies and materials (eg, additional supplies), provided by the physician over and above those usually included with the office visitUsed to bill for additional nonstandard supplies or small components needed during fitting.
    97530Therapeutic activities, direct (one-on-one) patient contact by the provider (use of dynamic activities to improve functional performance), each 15 minutesUsed by occupational therapists for task-oriented training integrating the powered wrist/terminal device into ADLs.
    64640Destruction by neurolytic agent, other peripheral nerve or branchListed as related only if diagnostic or therapeutic nerve procedures are performed in a separate surgical context impacting prosthetic control (rare adjunct); otherwise not typical.

    Related Modifiers

    8 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…
    54Modifier ‑54 (“Surgical care only”) is appended to a CPT surgical procedure when the reporting surgeon performs the intraoperative (surgical) component but does not furnish the preoperative and/or…- Use modifier -54 when the reporting surgeon provided only the intraoperative (surgical) component of a procedure and preoperative and/or postoperative management has been or will be provided by…
    55Modifier –55 indicates the billing provider furnished only postoperative management for a procedure that has a global surgical period. According to AAPC, this modifier is appended to the same CPT…- Use modifier -55 when billing the same CPT surgical code that has a 10- or 90-day global period and you, as a provider other than the original surgeon, furnished ONLY postoperative management (no…
    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…
    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…
    82Modifier 82 is appended to a surgical CPT code to indicate that an attending physician acted as an assistant because a qualified resident surgeon was unavailable. In teaching hospitals it documents…- When to use: Append modifier 82 in teaching-hospital settings to indicate a physician served as an assistant surgeon because a qualified resident surgeon was unavailable (includes situations where…

    Related Provider Taxonomies

    8 rows

    Taxonomy CodeSpecialtyNotes
    207P00000XEmergency Medicine PhysicianAn emergency physician focuses on the immediate decision making and action necessary to prevent death or any further disability both in the pre-hospit…
    363LA2200XAdult Health Nurse PractitionerPhysician Assistants & Advanced Practice Nursing Providers · Nurse Practitioner
    225100000XPhysical TherapistPhysical therapists (PTs) are licensed health care professionals who diagnose and treat individuals of all ages, from newborns to the very oldest, who…
    374U00000XHome Health AideA person trained to assist public health nurses, home health nurses, and other health professionals in the bedside care of patients in their homes.
    207RC0001XClinical Cardiac Electrophysiology PhysicianA field of special interest within the subspecialty of cardiovascular disease, specialty of Internal Medicine, which involves intricate technical proc…
    324500000XSubstance Abuse Rehabilitation FacilityA facility or distinct part of a facility that provides a 24 hr therapeutically planned living and rehabilitative intervention environment for the tre…
    224900000XMastectomy FitterAn individual trained in the fitting and adjusting of breast prostheses and management of post-mastectomy prostheses services.
    183500000XPharmacistAn individual licensed by the appropriate state regulatory agency to engage in the practice of pharmacy. The practice of pharmacy includes, but is no…

    Related ICD-10-CM Codes

    25 rows

    ICD-10-CM CodeDescription
    G56.01Carpal tunnel syndrome, right upper limb
    G56.02Carpal tunnel syndrome, left upper limb
    G56.21Lesion of ulnar nerve, right upper limb
    G56.22Lesion of ulnar nerve, left upper limb
    M05.841Other rheumatoid arthritis with rheumatoid factor of right hand
    M06.041Rheumatoid arthritis without rheumatoid factor, right hand
    M19.011Primary osteoarthritis, right shoulder
    M19.012Primary osteoarthritis, left shoulder
    M24.311Pathological dislocation of right shoulder, not elsewhere classified
    M24.312Pathological dislocation of left shoulder, not elsewhere classified

    Showing 1–10 of 25

    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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