CPT code 37213 denotes a catheter-directed thrombolytic infusion procedure with radiological supervision and interpretation performed on a subsequent treatment day for non-coronary vessels. This code captures the targeted delivery of thrombolytic medication via arterial or venous catheter, including necessary catheter contrast injections and repositioning. Nationally, catheter-directed thrombolysis is a critical intervention for selected acute and subacute thrombotic conditions where systemic therapy is inadequate or carries higher risk.

Key payers addressed in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise explanation of clinical context and service utilization, common billing considerations, and typical sites of service. The publication provides benchmarks for use frequency, payer coverage patterns, and recent policy updates affecting interventional radiology billing practices. It also outlines clinical scenarios in which CPT code 37213 is applied and highlights coding boundaries—specifically that this code represents a subsequent-day thrombolytic infusion for vessels other than coronary arteries.

This summary is intended for billing managers, interventional radiologists, and policy analysts seeking a practical, national-level reference on the clinical and coding scope of CPT code 37213.