Myocardial Infarction ICD-10-CM Codes

The general ICD-10-CM code for myocardial infarction is I21, which includes both ST elevation (STEMI) and non-ST elevation (NSTEMI) types. Specific subcodes like I21.4 (NSTEMI) or I21.3 (STEMI, unspecified site) should be used based on the clinical presentation.

The ICD-10-CM code for unspecified infarction is I21.9: Acute myocardial infarction, unspecified. This is used when the type or location of the MI has not been clearly documented.

Acute myocardial infarction (AMI) refers to a sudden and severe blockage of blood flow to part of the heart muscle, usually caused by a thrombus or embolus in a coronary artery. This blockage deprives the heart tissue of oxygen, leading to ischemia and eventual infarction, or tissue death, if not treated promptly.