Summary & Overview
CPT 25431: Carpal Bone Nonunion Repair with Graft and Fixation
CPT code 25431 captures surgical management of nonunion deformities in carpal bones other than the scaphoid, using bone grafting with fixation devices as needed. This code is used to bill for operative procedures that restore carpal alignment, stability, and promote bone healing—an important set of interventions in hand surgery that affect function and long-term disability risk. Nationally, accurate use of this code supports appropriate payment for reconstructive wrist procedures and helps track utilization of advanced hand surgery techniques.
Key payers in the national analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise clinical context for the procedure, typical sites of service, and the common billing modifiers associated with this service. The publication outlines expected documentation elements that support medical necessity and coding, summarizes payment and coverage considerations at a high level, and highlights where readers can expect variation across payers. This resource is intended for billing professionals, coding auditors, and clinical teams seeking clarity on the clinical intent and billing placement of CPT code 25431.
Data not available in the input: detailed payer-specific reimbursement rates, associated taxonomies, and ICD-10 diagnosis pairings.
Billing Code Overview
CPT code 25431 describes surgical treatment of a nonunion deformity of a carpal bone (excluding the scaphoid). The procedure involves correction of the deformity with placement of a bone graft and use of fixation devices as needed to attain stability and promote union.
Service type: Operative—open surgical repair with bone graft and internal fixation
Typical site of service: Hospital operating room or ambulatory surgical center (inpatient or outpatient surgical setting depending on clinical complexity and patient needs)
Clinical & Coding Specifications
Clinical Context
A 48-year-old right-hand dominant factory worker presents with persistent wrist pain and decreased grip strength six months after a fall onto an outstretched hand. Imaging (radiographs and CT) demonstrates a nonunion and deformity of the lunate (other carpal bones except scaphoid may be involved) with collapse and symptomatic instability. Conservative care including immobilization and activity modification failed. The hand surgeon plans an operative repair using autograft or allograft bone to achieve union and correct deformity, with supplemental internal fixation (e.g., screws, K-wires, small plates) as needed. The clinical workflow includes preoperative evaluation and informed consent, preoperative imaging and templating, intraoperative exposure of the involved carpal bone, debridement of the nonunion site, graft harvest or preparation, graft placement, fixation device placement, intraoperative fluoroscopic confirmation, wound closure, postoperative immobilization in a cast or splint, and scheduled follow-up with radiographs to assess graft incorporation and union.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
50 | Bilateral Procedure | Use when identical procedure is performed on both right and left wrists during same operative session. |
LT |