CPT code 36216 denotes selective catheter advancement into a second-order thoracic or brachiocephalic branch, most commonly used during diagnostic angiography to visualize distal branch anatomy. Nationally, this code captures a specific, targeted component of vascular diagnostic procedures and is important for accurately documenting the level of catheter selection and procedure complexity for both clinical records and payer adjudication. Key payers in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare.

Readers will learn the clinical context of CPT code 36216, typical sites of service, and which payers commonly cover or adjudicate claims involving selective second-order thoracic or brachiocephalic branch catheterization. The publication also provides benchmarks for utilization and billing practices, highlights relevant policy updates that affect coding and reimbursement, and outlines common documentation elements that support appropriate use of the code. Data not available in the input is noted where applicable. This summary is intended for a national audience of coding specialists, interventional clinicians, and health policy analysts seeking concise guidance on the role and reporting of CPT code 36216 in diagnostic vascular procedures.