Athscl heart disease of native cor art w unsp ang pctrs

This code signifies a diagnosis of atherosclerotic heart disease affecting the patient's original coronary arteries, where the specific type of angina pectoris experienced is not documented. It indicates the presence of plaque buildup in the native coronary vessels causing chest pain or discomfort, but the physician has not further specified the angina type (e.g., stable, unstable, Prinzmetal's).

Use this code when documentation clearly states atherosclerotic heart disease of native coronary arteries and angina pectoris is present, but the specific type of angina is not specified. This is appropriate for cases where the physician has diagnosed angina but has not elaborated on its characteristics.

• Do not use this code if the angina pectoris is explicitly documented as stable, unstable, or another specific type; instead, select the more precise code.
• Ensure the documentation specifies "native" coronary arteries to differentiate from bypass grafts.
• Remember the Excludes1 note: never code with I20.9 (unspecified angina pectoris without atherosclerotic heart disease).