Atherosclerosis of CABG, unsp, w unstable angina pectoris

This diagnosis code signifies the presence of unstable angina pectoris in a patient who has previously undergone coronary artery bypass graft (CABG) surgery, where the angina is attributed to atherosclerosis within the bypass graft(s). It indicates a new or worsening pattern of chest pain at rest or with minimal exertion, suggesting acute coronary ischemia related to the graft's narrowing.

Use this code when documentation explicitly states unstable angina pectoris and identifies atherosclerosis of the coronary artery bypass graft(s) as the underlying cause. This typically applies to patients presenting with acute coronary syndrome symptoms after CABG, where diagnostic workup (e.g., angiography) confirms graft disease.

• Ensure documentation clearly links the unstable angina to atherosclerosis of the bypass graft(s), not the native coronary arteries.
• Do not code with I20.0 (unstable angina pectoris without atherosclerosis of coronary artery bypass graft) as per Excludes1 note.
• Consider additional codes for other associated conditions, such as native coronary artery atherosclerosis if also present and documented.