HCPCS Level II code C1604 designates an implantable graft for a transmural transvenous arterial bypass supplied with all delivery system components. Such implantable vascular devices are critical in complex vascular and cardiothoracic procedures where reestablishing arterial flow via a transvenous route is required. Nationally, these devices influence surgical planning, device procurement, and billing classification for high-acuity vascular interventions.

Key payers in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of clinical context and typical sites of service, payer coverage landscape, common modifiers seen with device and procedure billing, and related coding considerations. The publication covers benchmarks and policy considerations relevant to hospital and inpatient billing for implantable vascular grafts, highlights areas where coverage variation commonly appears, and summarizes coding guidance tied to device supply and delivery components. This summary is intended for revenue integrity, clinical coding, and supply chain stakeholders who manage high-cost implantable vascular devices and need a clear, national-level synopsis of HCPCS Level II code C1604.