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I21 Acute myocardial infarction

ICD-10-CM category I21 sits in Chapter 9 (Diseases of the circulatory system, I00-I99). It contains 13 billable codes for FY2027, effective October 1, 2026 to September 30, 2027. Always code to the most specific code available: a code with more characters that describes the diagnosis more precisely takes priority over a shorter one.

Subcategories

I21.0 ST elevation (STEMI) myocardial infarction of anterior wallI21.1 ST elevation (STEMI) myocardial infarction of inferior wallI21.2 ST elevation (STEMI) myocardial infarction of other sitesI21.A Other type of myocardial infarction

Billable codes in I21

CodeDescription
I21.01ST elevation (STEMI) myocardial infarction involving left main coronary artery
I21.02ST elevation (STEMI) myocardial infarction involving left anterior descending coronary artery
I21.09ST elevation (STEMI) myocardial infarction involving other coronary artery of anterior wall
I21.11ST elevation (STEMI) myocardial infarction involving right coronary artery
I21.19ST elevation (STEMI) myocardial infarction involving other coronary artery of inferior wall
I21.21ST elevation (STEMI) myocardial infarction involving left circumflex coronary artery
I21.29ST elevation (STEMI) myocardial infarction involving other sites
I21.3ST elevation (STEMI) myocardial infarction of unspecified site
I21.4Non-ST elevation (NSTEMI) myocardial infarction
I21.9Acute myocardial infarction, unspecified
I21.A1Myocardial infarction type 2
I21.A9Other myocardial infarction type
I21.BMyocardial infarction with coronary microvascular dysfunction

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