Summary & Overview
CPT 26428: Central Slip Repair for Boutonniere Deformity
CPT code 26428 covers surgical repair of the central slip of the extensor tendon at the proximal interphalangeal joint, commonly used to correct boutonniere deformities and restore digital extension and function. This code is clinically important because boutonniere deformities can impair hand function and often require delicate reconstructive techniques—such as graft placement and scar shortening—to regain mobility. Nationally, procedural coding for hand and tendon repairs influences surgical reimbursement, care pathways, and authorization requirements across major payers.
Key payers in the analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of clinical intent and service setting, typical payer coverage patterns, common modifiers and billing considerations, and comparisons to related hand surgery codes where available. The publication highlights billing and documentation elements that affect claim adjudication, common sites of service, and the clinical context for when CPT code 26428 is appropriate.
This summary is intended for billing managers, surgical coders, and policy analysts seeking a national perspective on how CPT code 26428 is used in practice, what issues commonly arise in coverage and reimbursement, and where to focus documentation to support medical necessity.
Billing Code Overview
CPT code 26428 describes a surgical repair of the central slip of the extensor tendon at the proximal interphalangeal joint, typically performed to correct a boutonniere deformity. The procedure includes placement of a graft to lengthen the central slip and may involve secondary repair techniques such as shortening of scar tissue and reconstruction of the tendon to restore finger extension, function, and flexibility.
Service type: Surgical repair of extensor tendon (central slip) for boutonniere deformity
Typical site of service: Ambulatory surgical center or hospital operating room; outpatient hand surgery clinic for pre- and post-operative care
Clinical & Coding Specifications
Clinical Context
A 45-year-old right-hand dominant patient presents with progressive flexion deformity and inability to fully extend the proximal interphalangeal (PIP) joint of the index finger after a zone III extensor tendon injury and subsequent scarring. Conservative management with splinting and hand therapy over 8–12 weeks failed to restore extension. The hand surgeon evaluates extensor continuity and confirms attenuation/shortening of the central slip producing a boutonniere deformity. The patient is scheduled for operative repair under regional block or general anesthesia.
Preoperative workflow includes history, focused hand exam, informed consent, and imaging as needed (plain radiographs to exclude joint subluxation). In the operating room, the provider performs exploration of the extensor mechanism, releases scar tissue, shortens and repairs the functional scar when appropriate, and places a central slip graft to lengthen the extensor tendon to restore PIP extension and finger balance. Procedure time includes graft harvesting if autograft is used, or placement of tendon graft material. Postoperative workflow includes immobilization in an appropriate splint or dorsal blocking orthosis, initiation of early supervised hand therapy per surgeon protocol, pain management, and follow-up to monitor wound healing and tendon function. Typical discharge is same day for ambulatory surgery centers or short inpatient stay if regional anesthesia or comorbidities require observation.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
22 |