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I21

Non-Billable (Header)

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

Excludes 2 — Not included here, may code separately

  • 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)

Child Codes

I21.0ST elevation (STEMI) myocardial infarction of anterior wall
I21.1ST elevation (STEMI) myocardial infarction of inferior wall
I21.2ST elevation (STEMI) myocardial infarction of other sites
I21.3ST elevation (STEMI) myocardial infarction of unspecified site
HCC 228
I21.4Non-ST elevation (NSTEMI) myocardial infarction
HCC 228
I21.9Acute myocardial infarction, unspecified
HCC 228
I21.AOther type of myocardial infarction
I21.BMyocardial infarction with coronary microvascular dysfunction
HCC 228

Code Hierarchy

└I21Acute myocardial infarction
└I21Acute myocardial infarction

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