Athscl nonautologous biological CABG w unsp angina pectoris

This code describes the presence of atherosclerosis affecting a non-autologous biological coronary artery bypass graft, meaning a graft derived from a source other than the patient's own body (e.g., bovine, porcine), in a patient experiencing angina pectoris that is not further specified. It indicates a complication of a previous coronary artery bypass grafting procedure where the graft itself has developed atherosclerotic disease.

Use this code when documentation clearly states atherosclerosis within a non-autologous biological coronary artery bypass graft and the patient presents with angina pectoris that is not characterized as stable, unstable, or vasospastic. This code is appropriate for patients with a history of CABG using a biological xenograft or allograft who are now experiencing anginal symptoms due to graft disease.

• Ensure the documentation specifies a non-autologous biological graft, not a native coronary artery or an autologous graft (e.g., saphenous vein, internal mammary artery).
• Confirm that the angina is documented as "unspecified" or lacks further characterization (e.g., stable, unstable, Prinzmetal's).
• Do not code this with I20.9 (unspecified angina pectoris) as per the Excludes1 note; this code inherently includes the angina.