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  2. ICD-10-CM
  3. Ch. I00-I99
  4. Sec. I20-I25
  5. Category I21
Category I21

Acute myocardial infarction

Clinical Classification Guidelines

Specific Diagnosis Codes

ST elevation (STEMI) myocardial infarction of anterior wall
I21.0
ST elevation (STEMI) myocardial infarction involving left main coronary artery
I21.01
ST elevation (STEMI) myocardial infarction involving left anterior descending coronary artery
I21.02
ST elevation (STEMI) myocardial infarction involving other coronary artery of anterior wall
I21.09
ST elevation (STEMI) myocardial infarction of inferior wall
I21.1
ST elevation (STEMI) myocardial infarction involving right coronary artery
I21.11
ST elevation (STEMI) myocardial infarction involving other coronary artery of inferior wall
I21.19
ST elevation (STEMI) myocardial infarction of other sites
I21.2
ST elevation (STEMI) myocardial infarction involving left circumflex coronary artery
I21.21
ST elevation (STEMI) myocardial infarction involving other sites
I21.29
ST elevation (STEMI) myocardial infarction of unspecified site
I21.3
Non-ST elevation (NSTEMI) myocardial infarction
I21.4
Acute myocardial infarction, unspecified
I21.9
Other type of myocardial infarction
I21.A
Myocardial infarction type 2
I21.A1
Other myocardial infarction type
I21.A9
Myocardial infarction with coronary microvascular dysfunction
I21.B
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Data updated for October 2025 release.

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