Question: CPT codes for Operative Note DIAGNOSIS: Critical left main coronary artery stenosis; severe atherosclerotic disease of all native coronary arteries. PROCEDURES PERFORMED: Urgent coronary artery bypass grafting with placement of the left internal mammary artery to the left anterior descending coronary artery and placement of reverse saphenous vein grafts from the aorta to the right coronary artery, the obtuse marginal branch of the circumflex, and the diagonal branch. Endoscopic harvesting of the left greater saphenous vein from left leg. What are the appropriate code(s)/modifiers?