C7531 HCPCS - REVASCULARIZATION, ENDOVASCULAR, OPEN OR PERCUTANEOUS, FEMORAL, POPLITEAL ARTERY(IES), UNILATERAL, WITH TRANSLUMINAL ANGIOPLASTY WITH INTRAVASCULAR ULTRASOUND (INITIAL NONCORONARY VESSEL) DURING DIAGNOSTIC EVALUATION AND/OR THERAPEUTIC INTERVENTION, INCLUDING RADIOLOGICAL SUPERVISION AND INTERPRETATION