C7552 HCPCS - CATHETER PLACEMENT IN CORONARY ARTERY(S) FOR CORONARY ANGIOGRAPHY, INCLUDING INTRAPROCEDURAL INJECTION(S) FOR CORONARY ANGIOGRAPHY, IMAGING SUPERVISION AND INTERPRETATION; WITH CATHETER PLACEMENT(S) IN BYPASS GRAFT(S) (INTERNAL MAMMARY, FREE ARTERIAL, VENOUS GRAFTS) INCLUDING INTRAPROCEDURAL INJECTION(S) FOR BYPASS GRAFT ANGIOGRAPHY AND RIGHT HEART CATHETERIZATION WITH INTRAVASCULAR DOPPLER VELOCITY AND/OR PRESSURE DERIVED CORONARY FLOW RESERVE MEASUREMENT (CORONARY VESSEL OR GRAFT) DURING CORONARY ANGIOGRAPHY INCLUDING PHARMACOLOGICALLY INDUCED STRESS, INITIAL VESSEL