Atherosclerosis of CABG w unstable angina pectoris

This code signifies the presence of atherosclerosis affecting a coronary artery bypass graft other than the native coronary arteries, specifically when the patient is experiencing unstable angina. It indicates a critical narrowing or hardening of these grafted vessels, leading to acute cardiac ischemia.

Apply this code when documentation explicitly states atherosclerosis of a coronary artery bypass graft (e.g., saphenous vein graft, internal mammary artery graft) in a patient presenting with unstable angina. Supporting documentation includes physician notes detailing angina symptoms at rest or with minimal exertion, EKG changes, and cardiac enzyme results consistent with unstable angina, alongside imaging confirming graft atherosclerosis.

• Ensure documentation specifies "other" coronary artery bypass graft, distinguishing it from native coronary artery involvement.
• Do not code with I20.0 (unstable angina without atherosclerosis of other coronary artery bypass graft(s)) due to the Excludes1 note.
• Always sequence this code as the primary diagnosis when it is the reason for the encounter.