Summary & Overview
CPT 35521: Axillary-to-Femoral Vein Bypass
CPT code 35521 covers an open vascular surgical bypass that connects the axillary artery to the femoral artery using a vein graft to circumvent arterial occlusion. Nationally, this code represents a complex revascularization procedure used when standard femoropopliteal or aortoiliac approaches are not feasible. It is relevant to hospital surgical services, vascular surgery departments, and payers managing high-cost episodic surgical care for peripheral arterial disease.
Key payers discussed include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of clinical context, common settings for service, and what to expect in payment and coverage considerations for major national payers. The publication outlines typical sites of service, service-line placement within vascular surgery, and common billing modifiers and operational notes where available. It also summarizes benchmarking themes and policy updates affecting reimbursement and prior authorization practices.
The content is intended to inform coding professionals, revenue cycle managers, and policy analysts about the clinical nature of the procedure, payer coverage landscape, and areas where authorization and documentation are commonly required. Data not available in the input is noted where relevant.
Billing Code Overview
CPT code 35521 describes a surgical arterial bypass in which the provider creates a graft from the axillary artery to a portion of the femoral artery using a vein graft to bypass an occluded or stenotic vessel. This procedure is a form of peripheral arterial bypass surgery intended to restore blood flow to the lower extremity when native arterial conduits are unusable or obstructed.
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Service type: Open vascular surgical bypass using a vein graft connecting axillary artery to femoral artery
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Typical site of service: Hospital operating room or inpatient surgical suite
Clinical & Coding Specifications
Clinical Context
A typical patient is an adult with severe peripheral arterial occlusive disease causing critical limb ischemia or lifestyle-limiting claudication who has an occlusion of the iliac or femoral arterial inflow that is not amenable to percutaneous endovascular revascularization. The patient often presents with rest pain, non-healing foot ulcers, or recurrent ischemic symptoms despite medical therapy. Preoperative evaluation includes arterial imaging (CT angiography, duplex ultrasound, or conventional angiography), cardiopulmonary assessment, and vein mapping for autologous conduit selection.
In the operating room, under general or regional anesthesia, the vascular surgeon harvests a suitable autologous vein (commonly the greater saphenous vein), prepares proximal axillary artery exposure, and tunnels the vein graft subcutaneously to the femoral or distal femoral artery to bypass the obstructed segment. Intraoperative completion imaging (angiography or duplex) may be performed to confirm graft patency. Postoperative workflow includes intensive monitoring for limb perfusion, anticoagulation management, wound care, and follow-up vascular laboratory studies to assess graft function. Typical facility billing is for an inpatient or outpatient hospital-based vascular surgery service depending on patient comorbidity and procedure complexity.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
00 | No modifier | Use when no additional modifier applies to the service |