CPT code 26665 denotes an open surgical repair for fractures at the base of the thumb metacarpal with reduction of an associated carpometacarpal (CMC) joint dislocation. This procedure is a common hand surgery intervention after traumatic injury and carries implications for operative planning, device use (for example, pins or small nails), and post‑operative rehabilitation. Nationally, accurate coding for this operation affects surgical quality measurement, facility billing, and payment across major payers.

Key payers covered in this 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 an overview of common billing modifiers encountered with operative hand procedures (modifier list provided in input). The publication presents benchmarks for coding frequency and utilization where available, highlights policy considerations relevant to surgical reconstruction of the thumb CMC joint, and summarizes documentation elements commonly required for medical necessity and claim adjudication.

The content is aimed at coding professionals, surgical practices, and health plan policy staff seeking clarity on the clinical intent of CPT code 26665, expected care settings, and areas that frequently prompt payer review or inquiry. Data not available in the input is clearly noted in relevant sections.