Relating to Arterial Grafting for Coronary Artery Bypass (33533–33548): Using the CPT code book, identify the main term for the following scenario: POSTOPERATIVE DIAGNOSIS: Atherosclerotic heart disease of the native coronary arteries. PROCEDURE PERFORMED: Coronary artery bypass grafts x 3 with left internal mammary artery to left anterior descending bypass and sequential saphenous vein bypass from the aorta to the first obtuse marginal branch of the left circumflex with an ongoing graft to the posterior descending coronary artery. List the main term used to locate information in the Alphabetic Index