Summary & Overview
CPT 35694: Subclavian-to-Carotid Arterial Bypass
CPT code 35694 represents a surgical arterial bypass that exposes and divides the subclavian artery and anastomoses it to the carotid artery to circumvent arterial obstruction and improve blood flow. This complex vascular reconstruction is nationally relevant due to its role in limb and cerebral perfusion management, implications for surgical resource use, and interactions with payer coverage policies for vascular surgery.
Key payers discussed include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find an overview of clinical context for the procedure, typical sites of service, and the kinds of benchmarks and policy guidance commonly associated with high-complexity vascular surgical codes. The publication outlines common modifiers used with the code and highlights the clinical scenarios that drive utilization.
The analysis provides national-level context for clinicians, coding professionals, and policy analysts: clinical indications and service setting expectations, benchmarking considerations for use and reimbursement, and areas where payer policies and prior authorization practices frequently apply. Data not provided in the input are noted as unavailable where relevant; the focus remains on clarifying the code's clinical meaning and administrative attributes for stakeholders working with vascular surgery claims.
Billing Code Overview
CPT code 35694 describes a surgical arterial bypass in which the provider fully exposes the subclavian artery, divides it, and creates an anastomosis to the carotid artery to bypass an area of arterial blockage and improve arterial blood flow. This procedure is a form of extra-anatomic arterial bypass performed to restore adequate perfusion to the upper extremity or to cerebral circulation when standard proximal repair is not feasible.
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Service type: Surgical arterial bypass / vascular reconstructive surgery
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Typical site of service: Hospital operating room (inpatient or outpatient surgical setting depending on clinical indication and perioperative needs)
Clinical & Coding Specifications
Clinical Context
A typical patient is a 68-year-old male with symptomatic left upper extremity ischemia and vertebrobasilar insufficiency due to severe proximal left subclavian artery stenosis (subclavian steal phenomenon). He presents with exertional left arm claudication, decreased brachial pulses, and episodic dizziness. Noninvasive vascular testing (duplex ultrasound, ABI, and/or CTA) demonstrates high-grade proximal left subclavian artery occlusive disease proximal to the vertebral artery origin. After endovascular options are considered and either are not feasible or have failed, the vascular surgery team schedules an open carotid–subclavian bypass.
Preoperative workflow includes vascular laboratory imaging, cardiopulmonary risk assessment, medication review (antiplatelet and anticoagulation management), and informed consent. Intraoperative workflow involves general anesthesia, exposure of the ipsilateral common carotid artery and subclavian artery, division or bypass of the subclavian artery with creation of an anastomosis to the carotid artery, hemostasis, and wound closure. Postoperative care includes monitoring for neurologic changes, upper extremity perfusion, anticoagulation/antiplatelet therapy adjustment, and surveillance duplex before discharge and during follow-up.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
50 | Bilateral procedure | If procedure performed on both left and right subclavian arteries during same operative session (rare). |