C9797 HCPCS - VASCULAR EMBOLIZATION OR OCCLUSION PROCEDURE WITH USE OF A PRESSURE-GENERATING CATHETER (E.G., ONE-WAY VALVE, INTERMITTENTLY OCCLUDING), INCLUSIVE OF ALL RADIOLOGICAL SUPERVISION AND INTERPRETATION, INTRAPROCEDURAL ROADMAPPING, AND IMAGING GUIDANCE NECESSARY TO COMPLETE THE INTERVENTION; FOR TUMORS, ORGAN ISCHEMIA, OR INFARCTION