Answer: As long as a the arteriography meets the CPT® rules for a diagnostic service, such as the physician didn’t plan this intervention based on a previous study, the appropriate codes to request for authorization are 75710-26 (Angiography, extremity, unilateral, radiological, supervision and interpretation; Professional component) and 37224-37227 (Revascularization, endovascular, open or percutaneous, femoral, popliteal artery[s], unilateral …).
You mention an “intervention,” but don’t specify the type. Typically, payers allow you to report a range of codes for preapproval when the final procedure is uncertain.