Ischemic heart diseases (I20-I25)
I21: Acute myocardial infarction

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

useAdditionalCode
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)

excludes2
old myocardial infarction (I25.2)
postmyocardial infarction syndrome (I24.1)
subsequent type 1 myocardial infarction (I22.-)
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 unspecified site
I21.4: Non-ST elevation (NSTEMI) myocardial infarction
I21.9: Acute myocardial infarction, unspecified
I21.A: Other type of myocardial infarction

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