In ICD-10-CM, what is the default code for coronary artery atherosclerosis?

The default code for coronary artery atherosclerosis in ICD-10-CM is I25.10, which specifically denotes "Atherosclerotic heart disease of native coronary artery." This code is used when the documentation does not provide specific details about the condition beyond coronary artery atherosclerosis but indicates that the atherosclerosis results in angina or ischemic heart disease.

To clarify further, I25.9 is used for "Chronic ischemic heart disease, unspecified," which is a broader and less specific classification that does not pinpoint the presence of atherosclerosis determined by other criteria. Meanwhile, I21.9 refers to "Unspecified acute myocardial infarction," which does not apply to chronic conditions like atherosclerosis, and I73.9 is related to "Peripheral vascular disease, unspecified," thus not relevant to coronary artery conditions.