I21Acute myocardial infarction
ICD-10-CM category (non-billable header) code — part of Ischemic heart diseases (I20-I25)
Coding Notes
Includes
- cardiac infarction
- coronary (artery) embolism
- coronary (artery) occlusion
- coronary (artery) rupture
- coronary (artery) thrombosis
- infarction of heart, myocardium, or ventricle
- myocardial infarction specified as acute or with a stated duration of 4 weeks (28 days) or less from onset
Excludes2 (not part of this condition — may code both)
- old myocardial infarction (I25.2)
- postmyocardial infarction syndrome (I24.1)
- subsequent type 1 myocardial infarction (I22.-)
Use Additional Code
- code, if applicable, to identify:
- exposure to environmental tobacco smoke (Z77.22)
- history of tobacco dependence (Z87.891)
- occupational exposure to environmental tobacco smoke (Z57.31)
- status post administration of tPA (rtPA) in a different facility within the last 24 hours prior to admission to current facility (Z92.82)
- tobacco dependence (F17.-)
- tobacco use (Z72.0)
Subcategories (8)
- I21.0 ST elevation (STEMI) myocardial infarction of anterior wall
- I21.1 ST elevation (STEMI) myocardial infarction of inferior wall
- I21.2 ST elevation (STEMI) myocardial infarction of other sites
- I21.3 ST elevation (STEMI) myocardial infarction of unsp site
- I21.4 Non-ST elevation (NSTEMI) myocardial infarction
- I21.9 Acute myocardial infarction, unspecified
- I21.A Other type of myocardial infarction
- I21.B Myocardial infarction with coronary microvascular dysfnct