Summary & Overview
CPT 36224: Internal Carotid Artery Angiography, Imaging Supervision and Interpretation
CPT code 36224 denotes imaging supervision and interpretation for catheter-based angiography with selective catheterization from a distal artery into the thoracic aorta and into the internal carotid artery to visualize intracranial or extracranial arteries and the cervicocerebral arch. This code matters nationally because it captures a specialized diagnostic vascular procedure used to detect cerebrovascular disease, guide treatment planning, and support acute stroke and neurovascular care pathways. Its appropriate reporting affects clinical documentation, facility and professional billing, and utilization monitoring across hospital and interventional settings.
Key payers in scope include Aetna, Blue Cross Blue Shield, Cigna, UnitedHealthcare, and Medicare. Readers will find a concise explanation of the clinical context for the procedure, the typical site of service, and how the code is used for imaging supervision and interpretation. The publication provides benchmarks and payment context where available, highlights policy and coverage considerations relevant to payers listed above, and summarizes coding relationships that affect claim adjudication. Data not available in the input is noted where applicable.
Billing Code Overview
CPT code 36224 describes imaging supervision and interpretation for angiography performed by catheterization through a distal artery into the thoracic aorta and onward into the internal carotid artery. The procedure involves injection of contrast material to obtain X‑ray images of intracranial or extracranial arteries or of the cervicocerebral arch to identify vascular disease.
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Service type: Diagnostic catheter-based angiographic imaging with selective catheter placement into the internal carotid artery via a distal arterial approach.
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Typical site of service: Hospital radiology suites, hybrid operating rooms, or interventional suites where vascular angiography is performed.
Clinical & Coding Specifications
Clinical Context
A 68-year-old patient presents with sudden-onset right-sided weakness and aphasia. Initial non-contrast head CT excludes hemorrhage. CT angiography suggests a high-grade left internal carotid artery (ICA) stenosis with suspected tandem intracranial occlusion. The interventional neuroradiology team is consulted for diagnostic cerebral angiography and possible endovascular treatment. The patient is brought to the angiography suite in the hospital's interventional radiology or neurointerventional operating room. Under monitored anesthesia care or general anesthesia, vascular access is obtained via a distal arterial approach (commonly femoral or radial artery). A catheter is advanced into the thoracic aorta and selectively into the left common carotid and internal carotid arteries. The provider performs contrast injections with live fluoroscopic imaging to visualize intracranial and extracranial cervicocerebral arteries to define stenosis, occlusion, aneurysm, or vascular malformation. Images are interpreted intra-procedurally for decision-making about thrombolysis, mechanical thrombectomy, stenting, or further diagnostic sampling. Post-procedure, the patient is monitored in a post-anesthesia care unit or intensive care unit for neurovascular status, with orders for neuro checks, blood pressure control, and access-site observation. This workflow corresponds to imaging supervision and interpretation described by 36224 for selective catheter angiography of intracranial or extracranial carotid circulation.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
26 |