CPT code 36500 denotes the insertion of a catheter through a vein to a selected organ for the purpose of withdrawing blood from that organ's blood supply. This procedure captures organ-specific venous samples and is performed in settings equipped for vascular access, including hospital inpatient and outpatient units, interventional radiology suites, and procedure rooms. Nationally, the code matters for clinical workflows that require organ-directed hemodynamic or laboratory assessment and for payers managing utilization and coverage of invasive vascular procedures.

Key payers included in typical analyses are Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of the clinical intent of the code, typical sites of service, and the common payer landscape. The publication also outlines benchmarks and policy considerations relevant to billing and coverage (Data not available in the input), common modifier usage (Data not available in the input), and the clinical contexts in which organ-directed venous sampling is used.

This summary equips coding professionals, clinical staff, and payers with a clear description of CPT code 36500, its clinical purpose, and where it fits in procedural workflows.