CPT code 20955 denotes a microvascular free fibula bone graft: harvesting fibular bone with its arterial and venous supply and transplanting it to reconstruct major bone defects with restored vascularity. This procedure is clinically significant for complex orthopedic and maxillofacial reconstructions where reestablished blood flow improves healing, reduces nonunion risk, and supports bone regeneration. Nationally, the code captures high-complexity reconstructive services performed in hospital operating rooms or ambulatory surgical centers by surgical teams with microsurgical expertise.

Key payers in the national analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find an overview of how this service is described clinically, typical sites of service, and the context for utilization of vascularized bone grafting in major defect repair. The publication also outlines common billing modifiers associated with surgical procedures and highlights where data was unavailable in the input.

This report is intended to inform health policy analysts, clinical coders, and revenue cycle professionals about the clinical definition and billing context of CPT code 20955, provide benchmark and policy-oriented perspectives where available, and summarize the clinical scenarios that typically generate use of this code.