C9755 HCPCS - CREATION OF ARTERIOVENOUS FISTULA, PERCUTANEOUS USING MAGNETIC-GUIDED ARTERIAL AND VENOUS CATHETERS AND RADIOFREQUENCY ENERGY, INCLUDING FLOW-DIRECTING PROCEDURES (E.G., VASCULAR COIL EMBOLIZATION WITH RADIOLOGIC SUPERVISION AND INTERPRETATION, WHEN PERFORMED) AND FISTULOGRAM(S), ANGIOGRAPHY, VENOGRAPHY, AND/OR ULTRASOUND, WITH RADIOLOGIC SUPERVISION AND INTERPRETATION, WHEN PERFORMED