CPT code 64856 represents open surgical repair of a major peripheral nerve of the arm or leg (other than the sciatic nerve) that includes suturing of the nerve and transposition to a new adjacent location. This procedure is clinically important for restoring nerve continuity and function after traumatic injury or when entrapment or prior scarring necessitates relocation. Nationally, accurate coding for complex nerve repairs affects clinical documentation, appropriate surgical reimbursement, and postoperative care pathways.

Key payers covered in this overview include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a clinical and billing-focused briefing explaining the procedure type, typical settings where it is performed, and the administrative context for claims handling. The publication also summarizes benchmarking elements, common modifier usage (where provided), and implications for payer adjudication and documentation expectations.

The analysis provides clinicians and coding professionals with a concise reference on service definition and typical site of service, an orientation to payer coverage landscape, and guidance on what to review in clinical documentation to support correct coding. Data not available in the input is identified where applicable.