CPT code 64859 designates an add-on surgical procedure for repair of additional peripheral nerves when multiple nerves require repair due to trauma, lesions, infection, or other causes. As an add-on code, 64859 is reported in conjunction with a primary nerve repair procedure to capture work performed on extra nerves during the same operative session. This coding is important nationally for accurate capture of surgical complexity, resource use, and proper payment when multiple nerve repairs occur.

Key payers covered in this overview include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise description of clinical context and service sites, guidance on how this code functions as an add-on to primary nerve repair procedures, and what to expect in payer coverage patterns. The publication outlines benchmarks and coding practice implications, highlights common modifier usage where relevant, and summarizes any policy or billing considerations that typically affect payment for add-on nerve repair services.

This resource is designed for revenue cycle staff, surgical coders, and clinical administrators seeking a national-level briefing on clinical meaning, billing context, and payer coverage landscape for CPT code 64859.