Summary & Overview
CPT 37218: Intrathoracic Common Carotid or Innominate Artery Stent Placement
CPT code 37218 covers catheter-directed placement of one or more stents in the intrathoracic common carotid artery or the innominate artery, performed via an open or percutaneous antegrade approach and often including angioplasty and radiologic supervision/interpretation. This procedure is a high-acuity endovascular service used to treat significant proximal carotid or brachiocephalic disease that can affect cerebral perfusion and stroke risk, and it carries implications for hospital resources, imaging utilization, and specialist credentialing.
Key payers in national coverage discussions include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers can expect a concise view of clinical context, typical settings of care, and the payment and coding considerations that influence access and facility planning. The brief covers service definitions, common modifiers (listed separately), and the range of sites where the service is delivered, as well as benchmarking and policy-relevant notes where available. Data not available in the input is noted where applicable. The summary is aimed at health plan analysts, hospital billing teams, and clinical leaders assessing utilization, coverage policy alignment, and operational impacts of carotid/innominate artery stenting.
Billing Code Overview
CPT code 37218 describes endovascular stent placement in the intrathoracic common carotid artery or the innominate (brachiocephalic) artery. The provider uses a catheter-based, antegrade approach — which may be open or percutaneous — to position one or more stents. The service may include angioplasty and includes radiologic supervision and interpretation performed by the provider.
-
Service type: Endovascular stent placement / carotid/innominate artery stenting
-
Typical site of service: Hospital inpatient or outpatient vascular/interventional radiology or hybrid operating room
Clinical & Coding Specifications
Clinical Context
A typical patient is an older adult with symptomatic high-grade atherosclerotic stenosis of the intrathoracic common carotid artery or the innominate (brachiocephalic) artery presenting with transient ischemic attacks, crescendo transient neurological deficits, or hemodynamically significant stenosis discovered during stroke workup. The patient commonly has vascular risk factors such as hypertension, hyperlipidemia, diabetes mellitus, and a history of smoking. Diagnostic imaging (CTA, MRA, or catheter-based diagnostic angiography) confirms focal severe stenosis amenable to endovascular treatment.
The clinical workflow includes pre-procedure evaluation by a vascular surgeon or interventional radiologist (history, anticoagulation/antiplatelet management, informed consent), cross-sectional vascular imaging, and peri-procedural planning (access route, device sizing). The procedure is performed in an angiography suite or hybrid operating room under conscious sedation or general anesthesia. Using an antegrade open or percutaneous arterial approach, the operator advances a guide catheter to the target intrathoracic vessel, performs angioplasty if needed, and deploys one or more stents to restore luminal diameter. Continuous fluoroscopic guidance and radiologic supervision and interpretation are provided. Post-procedure monitoring includes neurological checks, access-site inspection, antiplatelet therapy, and follow-up vascular imaging to assess stent patency.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
00 |