Summary & Overview
CPT 35509: Carotid-to-Carotid Bypass with Vein Graft
CPT code 35509 represents carotid-to-carotid bypass with vein graft, a vascular surgery that connects one carotid artery to a portion of the contralateral carotid artery using an autologous vein to bypass an obstructed vessel. This complex revascularization procedure matters nationally because it addresses high-risk cerebrovascular occlusive disease where conventional endarterectomy or stenting may be unsuitable. Its use has implications for surgical capacity, hospital resource allocation, and payer coverage policy for advanced cerebrovascular interventions.
Key payers covered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find context on clinical indications and typical care settings, a summary of payer coverage considerations and common billing modifiers, and national-level benchmarking where available. The publication outlines how the procedure is reported, typical sites of service, and operational factors that influence utilization and reimbursement. Data not available in the input will be explicitly noted where applicable. This summary prepares clinicians, coders, and policy analysts to understand the clinical role of CPT code 35509, typical billing context, and areas where payer policy and hospital practice intersect for complex carotid bypass surgery.
Billing Code Overview
CPT code 35509 describes a surgical bypass procedure in which the provider bypasses a blood vessel blockage by inserting a bypass graft that connects one carotid artery to a portion of another carotid artery on the opposite side of the neck using a vein graft. This procedure is performed to reestablish adequate cerebral perfusion when carotid artery occlusive disease affects flow and direct repair is not feasible.
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Service type: Surgical vascular bypass using autologous vein graft
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Typical site of service: Inpatient or outpatient hospital operating room, depending on clinical status and complexity
Clinical & Coding Specifications
Clinical Context
A typical patient is a 68-year-old man with symptomatic high-grade carotid artery occlusive disease who presents with recurrent transient ischemic attacks and progressive carotid stenosis not amenable to endovascular therapy. After vascular surgery consultation, imaging with carotid duplex ultrasound and CT angiography demonstrates an occluded proximal right common carotid artery with inadequate inflow on that side and a patent left common and internal carotid system. The care team schedules an open carotid-carotid bypass using an autologous vein graft to re-establish cerebral perfusion.
Preoperative workflow includes vascular history and focused neurologic exam, medication reconciliation (antiplatelet and anticoagulation management), anesthesia assessment, duplex and CT angiography review, and informed consent documenting anticipated risks and benefits. Intraoperative workflow involves general anesthesia, exposure of both carotid arteries in the neck, harvest of the vein graft (typically greater saphenous vein), systemic heparinization, proximal and distal control of vessels, construction of the bypass graft between the patent left carotid and the target segment on the right, flow assessment, hemostasis, and wound closure.
Postoperative workflow includes neurologic monitoring in a post-anesthesia care unit or intensive care setting, blood pressure control, antiplatelet therapy resumption per vascular surgeon instructions, graft surveillance with duplex ultrasound before discharge and at follow-up, and documentation of procedural details including graft type, laterality, and any intraoperative complications. Typical site of service is an inpatient hospital operating room with a vascular surgery team; ambulatory surgery centers are not typical for this level of open vascular reconstruction.
Coding Specifications
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