CPT 35518 Axillary Bypass Reimbursement & Policy

Headline: CPT code 35518: Axillary-to-Axillary Artery Bypass Using Vein Graft

Lead: CPT code 35518 covers surgical bypass of an axillary artery obstruction by placing a vein graft between the two axillary arteries. The code captures a specialized vascular bypass procedure used to restore upper-extremity arterial flow when focal lesions or occlusions compromise perfusion.

Why it matters: This code identifies a relatively uncommon but clinically significant vascular surgery with implications for acute limb ischemia management, revascularization strategies, and surgical resource use. Nationally, accurate coding of arterial bypass procedures affects quality measurement, payer claims adjudication, and hospital case-mix reporting.

Payers covered: Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare are the principal payers considered for coverage and reimbursement patterns in this analysis.

What readers will learn: The publication provides clinical context for the procedure, coding and billing considerations tied to operative setting, payment benchmarks where available, and policy-relevant updates that affect reimbursement and prior authorization processes. It outlines typical sites of service and the clinical scenarios in which CPT code 35518 is used.

Structure: The report is organized to present key findings first, followed by detailed methodology, payer-specific considerations, and appendices with coding notes and references.

Billing Code Overview

CPT code 35518 describes a surgical bypass procedure in which the provider connects one axillary artery to the other axillary artery using a vein graft to bypass a blood vessel blockage. This procedure is a form of arterial bypass surgery addressing obstructive disease of the axillary arterial segment.

Service Type: Surgical arterial bypass

Typical Site of Service: Inpatient or outpatient hospital operating room

Clinical Context

A 68-year-old patient with progressive upper extremity ischemia due to chronic axillary artery occlusive disease presents with worsening claudication, rest pain, and nonhealing hand ischemic changes. After diagnostic workup including arterial duplex ultrasound and computed tomography angiography confirming a long-segment occlusion of the right axillary artery not amenable to endovascular recanalization, vascular surgery schedules an open axilloaxillary bypass using an autologous vein graft (CPT 35518). The clinical workflow includes preoperative medical optimization (antiplatelet therapy, cardiac risk assessment), informed consent discussing graft options and risks, harvesting of the autogenous vein conduit (typically great saphenous or arm vein), exposure of both axillary arteries, creation of proximal and distal anastomoses, graft tunneling and flow assessment, wound closure, and postoperative monitoring in PACU with vascular checks and anticoagulation as indicated. Typical site of service is an inpatient or hospital-based outpatient surgical setting (operating room) with possible admission for observation or inpatient care for complex comorbidity or revascularization monitoring.

Coding Specifications

Modifier	Description	When to Use
`00`	No regional payment adjustments (placeholder standard)	Rarely appended; used per payer-specific rules when required to indicate standard payment status.

Taxonomy Code	Specialty	Notes
2080S00000X	Vascular Surgery	Primary specialty performing axilloaxillary bypass grafting.
207R00000X	General Surgery	General surgeons with vascular training may perform upper extremity bypass.
207L00000X	Thoracic Surgery	Thoracic/vascular surgeons may be involved when thoracic inlet exposure is required.
207K00000X	Plastic and Reconstructive Surgery	Occasionally involved for complex soft tissue coverage or conduit harvest in select cases.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`I70.209`	Atherosclerosis of native arteries of the extremities, unspecified extremity, unspecified	Atherosclerotic occlusive disease leading to axillary artery occlusion requiring bypass.
`I70.231`	Atherosclerosis of native arteries of the extremities with intermittent claudication, right upper extremity	Presents with exertional ischemia prompting revascularization such as axilloaxillary bypass.
`I70.239`	Atherosclerosis of native arteries of the extremities with rest pain, unspecified upper extremity	Rest pain reflects critical limb ischemia indication for surgical bypass.
`I70.241`	Atherosclerosis of native arteries of the extremities with ulceration, right upper extremity	Ulceration or nonhealing wounds from ischemia may necessitate surgical revascularization.
`I74.3`	Embolism and thrombosis of arteries of the upper extremity	Acute or chronic embolic/thrombotic occlusion may be treated with bypass when other options are unsuitable.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`32551`	Tube thoracostomy, with or without water seal; insertion, includes drainage when required	May be performed if chest extension or pleural entry occurs during tunneling or exposure near thoracic inlet.
`35476`	Extra-anatomic bypass, axillofemoral — bypass grafting from axillary artery to femoral artery	Alternative extra-anatomic bypass option when axilloaxillary bypass is not appropriate; represents related revascularization strategies.
`36831`	Open surgical treatment of aneurysm or dissection of peripheral arteries; bypass graft, with vein graft, brachial to distal vessels (example)	Represents comparable peripheral bypass techniques using autogenous vein conduit; similar coding principles for vein grafting.
`36415`	Collection of venous blood by venipuncture	Common preoperative laboratory sampling prior to vascular surgery.
`36556`	Insertion of non-tunneled centrally inserted central venous catheter	May be used perioperatively for hemodynamic monitoring or administration of vasoactive medications in complex patients.

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Summary & Overview

CPT 35518: Axillary-to-Axillary Artery Bypass with Vein Graft