CPT 35501 Carotid Bypass Reimbursement & Policy | OpenPayer

Summary & Overview

CPT 35501: Carotid Common-to-Internal Artery Bypass Graft

CPT code 35501 denotes an open vascular procedure to bypass a blockage by grafting the common carotid artery to the internal carotid artery on the same side of the neck. The code captures a technically complex revascularization procedure used to restore cerebral blood flow when intracranial or extracranial carotid lesions are not amenable to endarterectomy or endovascular repair. Nationally, this code is relevant for vascular surgery programs, hospital surgical departments, and payers managing high-acuity cerebrovascular interventions.

Key payers considered in national coverage and payment discussions include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find clinical context for the procedure, typical sites of service, and the scope of application for carotid bypass grafting. The publication also summarizes typical billing considerations and common modifiers when available, and highlights what institutions and payers generally consider when evaluating claims for complex carotid revascularization.

This guide is intended to give a concise operational and clinical overview of CPT code 35501, help stakeholders recognize when the code applies, and outline the kinds of benchmarks, policy topics, and clinical contexts that commonly influence coverage and utilization nationally.

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Billing Code Overview

CPT code 35501 describes a surgical procedure in which a provider bypasses a blockage in a carotid blood vessel by placing a bypass graft that connects the common carotid artery to a portion of the internal carotid artery on the same side of the neck. This is a vascular surgical procedure addressing carotid artery occlusive disease.

Service type: Open vascular bypass surgery involving arterial graft placement
Typical site of service: Hospital operating room or specialized vascular surgery suite

Data not available in the input.

Clinical & Coding Specifications

Clinical Context

A 72-year-old male with symptomatic, high-grade internal carotid artery (ICA) stenosis presents with crescendo transient ischemic attacks (TIAs) affecting the right cerebral hemisphere. Noninvasive vascular imaging (carotid duplex ultrasound and CT angiography) confirms an occlusive plaque at the proximal right ICA with inadequate distal runoff and a high risk of stroke. After multidisciplinary review, the vascular surgeon elects to perform a carotid bypass: creation of a graft connecting the right common carotid artery to a patent segment of the right internal carotid artery to restore antegrade flow and prevent further ischemic events.

Preoperative workflow includes neurological assessment, cross-sectional vascular imaging, cardiac risk evaluation, antiplatelet management, and informed consent discussing procedural risks (stroke, cranial nerve injury, graft occlusion). Intraoperative workflow involves general anesthesia, cervical exposure, heparinization, harvesting or selection of conduit (e.g., prosthetic or autologous vein), proximal and distal anastomoses between the common carotid artery and internal carotid artery, completion angiography or duplex to confirm flow, and postoperative monitoring in a PACU or ICU with neurologic checks and blood pressure control. Discharge planning includes antiplatelet therapy and vascular follow-up.

Coding Specifications

Modifier	Description	When to Use
`00`	No modifier (default)	Use when no modifier applies and the claim reflects standard services.

CPT 35535: Hepatic-to-Renal Artery Bypass with Vein Graft

CPT-35572-FEMOROPOPLITEAL-VEIN-HARVEST-FOR-VASCULAR-RECONSTRUCTION

CPT 35572: Femoropopliteal Vein Harvest for Vascular Reconstruction

CPT-35522-AXILLARY-TO-BRACHIAL-VEIN-BYPASS

CPT 35522: Axillary-to-Brachial Vein Bypass

CPT-35556-FEMORAL-TO-POPLITEAL-VEIN-BYPASS-GRAFT

CPT 35556: Femoral to Popliteal Vein Bypass Graft

CPT-35525-BRACHIAL-ARTERY-BRACHIAL-ARTERY-VEIN-BYPASS-GRAFT

CPT 35525: Brachial Artery-to-Brachial Artery Vein Bypass

CPT-35566-FEMORAL-TO-TIBIAL-PERONEAL-BYPASS

CPT 35566: Femoral-to-Tibial/Peroneal Arterial Bypass

CPT-35512-SUBCLAVIAN-TO-BRACHIAL-ARTERY-VEIN-BYPASS

CPT 35512: Subclavian-to-Brachial Artery Vein Bypass

CPT-35500-ARM-VEIN-HARVEST-FOR-BYPASS-CONDUIT

CPT 35500: Upper-Extremity Vein Harvest for Bypass Conduit

CPT-35539-AORTO-FEMORAL-VEIN-BYPASS-GRAFT

CPT 35539: Aorto-Femoral Vein Bypass Graft

CPT-35533-AXILLOFEMORAL-BYPASS-VEIN-GRAFT-BILATERAL

CPT 35533: Axillofemoral Bypass Using Vein Graft, Bilateral

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Taxonomy Code	Specialty	Notes
2080S0103X	Vascular Surgery	Primary specialty performing extracranial carotid bypass procedures.
207L00000X	Cardiothoracic Surgery	May perform carotid bypass in conjunction with thoracic procedures or complex cerebrovascular reconstructions.
207P00000X	General Surgery	Vascular-trained general surgeons perform open carotid bypass in select centers.
2086S0100X	Neurosurgery	May be involved for complex cerebrovascular anatomy or stroke-focused teams.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`I65.21`	Occlusion and stenosis of right carotid artery	High-grade stenosis or occlusion of the internal carotid artery prompting bypass to restore cerebral perfusion.
`I65.22`	Occlusion and stenosis of left carotid artery	Left-sided disease when bypass is indicated to prevent ischemic stroke.
`G45.9`	Transient cerebral ischemic attack, unspecified	TIAs are common presenting symptoms that lead to consideration of carotid revascularization.
`I63.9`	Cerebral infarction, unspecified	Prior ischemic stroke with residual severe carotid disease may prompt bypass if other options are unsuitable.
`I66.9`	Occlusion and stenosis of unspecified cerebral artery	Complex cerebrovascular disease requiring extracranial-intracranial revascularization strategies including carotid bypass.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`35721`	Carotid-subclavian bypass, with vein and prosthetic grafts, when performed	May be performed in the same operative setting when proximal inflow requires augmentation or when multilevel supra-aortic revascularization is needed.
`35301`	Carotid endarterectomy, with or without patch graft	Often an alternative to bypass; may be performed on the contralateral side or when plaque is localized and amenable to endarterectomy.
`75962`	Intra-arterial vascular imaging, radiological supervision and interpretation	Used intraoperatively or immediately postoperatively to confirm graft patency and distal flow.
`93010`	Electrocardiogram, routine EKG with interpretation	Performed preoperatively for cardiac risk assessment prior to carotid bypass.
`93799`	Unlisted cardiovascular service or procedure	Used when a specific vascular imaging or monitoring procedure related to carotid bypass has no established code; billed with documentation.

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