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.