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.