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    OpenPayerBilling CodesProsthetic ProceduresHCPCS hcpcs-l8659-interphalangeal-finger-joint-replacement-metal-ceramic
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    HCPCS L8659: Interphalangeal Finger Joint Replacement Implant

    HCPCS Level II code L8659 describes a surgical implant device: an interphalangeal finger joint replacement composed of two or more pieces and made of metal (e.g., stainless steel or cobalt chrome) and a ceramic-like material (e.g., pyrocarbon), intended for surgical implantation; the service is a finger joint arthroplasty device used during operative procedures, and the typical site of service is an outpatient or hospital surgical setting where hand and orthopedic reconstructive surgeries are performed.

    For related coverage guidance, see recent payer policy updates: Speech Therapy for Autism Disorders - Medical Policy, Physical Performance Test or Measurement, Sensory Integration Therapy and Auditory Integration Training.

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    Table of contents

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    Clinical & Coding Specifications

    Clinical Context

    A 62-year-old right-hand–dominant patient with progressive pain, stiffness, and deformity of the proximal interphalangeal (PIP) joint of the index finger presents after failure of conservative care (splinting, NSAIDs, corticosteroid injection, and hand therapy). Imaging shows advanced degenerative changes with joint space loss and osteophyte formation. The orthopedic hand surgeon recommends surgical reconstruction with an interphalangeal finger joint arthroplasty using a two-piece metal and pyrocarbon implant (L8659).

    Preoperative workflow includes history and physical, informed consent discussing implant type and risks, preoperative clearance (cardiac risk assessment if indicated), and template radiographs for implant sizing. Intraoperative steps: regional block or general anesthesia, dorsal or lateral approach to the PIP joint, soft tissue releases and osteophyte removal, bone preparation, trialing, and implantation of the two-piece metal/ceramic-like prosthesis. Closure and postoperative splinting follow. Typical postoperative care includes wound checks, suture removal at 10–14 days, and progressive hand therapy focusing on range of motion and strengthening. Potential clinical indications include painful osteoarthritis, posttraumatic arthritis, and certain inflammatory arthritides when joint preservation or arthrodesis is not preferred.

    Related CPT Codes

    CPT CodeDescriptionRelationship to This Procedure
    20670Open treatment of phalangeal fracture, with or without internal or external fixation, each bonePerformed when acute fracture requires open fixation prior to or instead of arthroplasty
    26010Arthrotomy, with exploration, with or without synovectomy, small joint of hand, by incision of joint capsule (eg, interphalangeal joint)May be performed for joint exploration, debridement, or synovectomy during arthroplasty procedure
    26440Arthroplasty, interphalangeal joint, with implant (interphalangeal joint replacement)Code describing interphalangeal joint arthroplasty procedures; used in surgical documentation and payer guidance when CPT mapping applies
    26160Excision, tumor, deep soft tissue of hand or finger; single lesionUsed when removing accessory bony or soft tissue masses encountered during joint reconstruction
    29515Strapping; finger(s), single, initial applicationCommon postprocedural immobilization technique applied in recovery and hand therapy phases

    Related Modifiers

    7 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…
    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…
    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 Code
    207K00000X
    363A00000X
    261QR0206X
    282J00000X
    363AS0400X
    261QP0905X
    133VN1301X
    1223X2210X

    Related ICD-10-CM Codes

    21 rows

    ICD-10-CM CodeDescription
    G56.01Carpal tunnel syndrome, right upper limb
    L89.141Pressure ulcer of left lower back, stage 1
    M05.79Rheumatoid arthritis with rheumatoid factor of multiple sites without organ or systems involvement
    M06.4Inflammatory polyarthropathy
    M06.9Rheumatoid arthritis, unspecified
    M15.4Erosive (osteo)arthritis
    M16.9Osteoarthritis of hip, unspecified
    M17.9Osteoarthritis of knee, unspecified
    M19.041Primary osteoarthritis, right hand
    M19.042Primary osteoarthritis, left hand

    Showing 1–10 of 21

    Related Payer Policy Updates

    Specialty: Physical Medicine, Rehab & Therapies1 / 2

    10 rows

    PolicyPayerEffective Date
    Speech Therapy for Autism Disorders - Medical PolicyHealth-New-England2026-12-01
    Physical Performance Test or MeasurementCigna2026-11-15
    Sensory Integration Therapy and Auditory Integration TrainingColorado Rocky Mountain Health Plans2026-11-01
    Chiropractic Careexcellus_health_plan_inc2026-10-22
    Skilled Nursing and Skilled Rehabilitation Services (Outpatient)Anthem2026-10-01
    Habilitation and Rehabilitation Therapy (Occupational, Physical, and Speech) (for New Mexico Only)UnitedHealthcare2026-10-01
    Physical Therapy/Medicine Corporate Medical Policybcbsvermont2026-10-01
    Occupational Therapy Corporate Medical Policybcbsvermont2026-10-01
    Speech Language Pathology/Therapy Services Corporate Medical Policybcbsvermont2026-10-01
    Cognitive Rehabilitation Corporate Medical Policybcbsvermont2026-10-01

    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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