ICD-10-CM category
I21 Acute myocardial infarction
I21 is a category, not a billable code. Report one of the 13 complete codes below.
Codes in I21
- 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
Outside the US? I21 in the international WHO ICD-10 lists its inclusion and exclusion notes.
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ICD-10-CM is developed by the National Center for Health Statistics (NCHS), Centers for Disease Control and Prevention, U.S. Department of Health and Human Services, and is based on the WHO ICD-10. Codes and titles are reproduced unchanged from the FY2026 code list (effective 1 October 2025). Their use here does not imply endorsement by CDC, HHS or the U.S. Government. Changes effective on or after 1 October 2026 may not be reflected yet; check the current release at cdc.gov or cms.gov before submitting claims.
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