Summary & Overview
CPT 26861: Add‑on Interphalangeal Joint Arthrodesis
CPT code 26861 is an add-on surgical code for immobilizing an additional interphalangeal joint of the finger performed in the same operative session as arthrodesis of one interphalangeal joint. The procedure can be done with or without internal fixation and is used in hand surgery to achieve joint fusion and relieve pain or correct deformity. Nationally, this code is important for accurate reporting of multi-joint arthrodesis procedures and affects surgical billing, bundling considerations, and procedure-level utilization metrics.
Key payers covered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise review of clinical context, coding intent, and common billing considerations tied to add-on arthrodesis procedures. The publication outlines what to expect in payer coverage patterns, common modifier usage, and how this add-on code relates to operative reporting and reimbursement workflows. It also provides benchmarks and policy updates relevant to surgical hand procedures, clarifies service line and site-of-service implications, and highlights areas where prior authorization or documentation may commonly be required.
This summary is written for a national audience and focuses on clinical and billing context, payer coverage scope, and operational implications for providers and billing professionals.
Billing Code Overview
CPT code 26861 describes an add-on surgical procedure in which the provider surgically immobilizes an additional interphalangeal joint of the finger during the same session as arthrodesis of one interphalangeal joint. The procedure may be performed with or without internal fixation and is specific to joints between the phalanges of the hand.
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Service type: Surgical procedure — add-on interphalangeal joint arthrodesis
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Typical site of service: Outpatient surgical center or hospital operating room (hand surgery setting)
Data not available in the input for payers, taxonomies, ICD-10 diagnoses, and related codes.
Clinical & Coding Specifications
Clinical Context
A 62-year-old right-handed patient with progressive painful osteoarthritis and deformity of multiple distal interphalangeal (DIP) joints presents for surgical fusion. During a single operative session the hand surgeon performs arthrodesis of one DIP joint and elects to surgically immobilize an additional interphalangeal joint of the same finger. The procedure may use internal fixation (e.g., headless compression screw or K-wire) or rely on compression and bone grafting without permanent hardware. Typical workflow: preoperative evaluation in the orthopedic or hand surgery clinic, informed consent addressing expected loss of joint motion and wound/nerve risks, operative suite procedure under regional block or general anesthesia, intraoperative fluoroscopic confirmation of joint alignment and fixation, postoperative immobilization in a splint or cast, and routine follow-up visits for wound check and radiographic confirmation of fusion. Typical setting is an ambulatory surgery center or hospital outpatient surgical department; inpatient admission is uncommon unless medical comorbidities require observation.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
50 | Bilateral procedure | When identical interphalangeal arthrodeses are performed on both hands in the same operative session (rare for this code). |
51 |