CPT code 35631 represents an open vascular bypass procedure using a synthetic graft to reroute blood flow from the aorta around an occlusion in a celiac, mesenteric, or renal artery. This procedure is clinically significant for restoring visceral or renal perfusion and can be critical for preventing organ ischemia, loss of function, or life-threatening complications. Nationally, such arterial bypass procedures are a component of vascular surgery services subject to payer coverage policies, prior authorization practices, and quality reporting for major vascular interventions.

Key payers addressed include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. The publication provides a concise overview of coverage considerations and common billing practice elements tied to this code, and summarizes benchmarks where available. Readers will find clinical context explaining the procedure type and typical site of service, a review of common modifiers used with major vascular procedures, and guidance on where to locate relevant payer policies and Medicare coding references. Data not available in the input is noted explicitly where applicable. The content is written for a national audience and focuses on code definition, payer landscape, and practical billing context rather than state-specific rules or clinical recommendations.