 I21 |
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Acute myocardial infarction  |
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| 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
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| 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)
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| Excludes2 |
old myocardial infarction (I25.2)
postmyocardial infarction syndrome (I24.1)
subsequent type 1 myocardial infarction (I22.-)
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| I21.0 |
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ST elevation (STEMI) myocardial infarction of anterior wall |
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| Type 1 ST elevation myocardial infarction of anterior wall |
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 I21.01 |
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ST elevation (STEMI) myocardial infarction involving left main coronary artery |
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| I21.02 |
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ST elevation (STEMI) myocardial infarction involving left anterior descending coronary artery |
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| ST elevation (STEMI) myocardial infarction involving diagonal coronary artery |
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| I21.09 |
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ST elevation (STEMI) myocardial infarction involving other coronary artery of anterior wall |
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| Acute transmural myocardial infarction of anterior wall | | Anteroapical transmural (Q wave) infarction (acute) | | Anterolateral transmural (Q wave) infarction (acute) | | Anteroseptal transmural (Q wave) infarction (acute) | | Transmural (Q wave) infarction (acute) (of) anterior (wall) NOS |
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| I21.1 |
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ST elevation (STEMI) myocardial infarction of inferior wall |
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| Type 1 ST elevation myocardial infarction of inferior wall |
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| I21.11 |
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ST elevation (STEMI) myocardial infarction involving right coronary artery |
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| Inferoposterior transmural (Q wave) infarction (acute) |
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| I21.19 |
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ST elevation (STEMI) myocardial infarction involving other coronary artery of inferior wall |
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| Acute transmural myocardial infarction of inferior wall | | Inferolateral transmural (Q wave) infarction (acute) | | Transmural (Q wave) infarction (acute) (of) diaphragmatic wall | | Transmural (Q wave) infarction (acute) (of) inferior (wall) NOS |
| Excludes2 |
ST elevation (STEMI) myocardial infarction involving left circumflex coronary artery (I21.21)
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| I21.2 |
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ST elevation (STEMI) myocardial infarction of other sites |
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| Type 1 ST elevation myocardial infarction of other sites |
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| I21.21 |
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ST elevation (STEMI) myocardial infarction involving left circumflex coronary artery |
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| ST elevation (STEMI) myocardial infarction involving oblique marginal coronary artery |
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| I21.29 |
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ST elevation (STEMI) myocardial infarction involving other sites |
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| Acute transmural myocardial infarction of other sites | | Apical-lateral transmural (Q wave) infarction (acute) | | Basal-lateral transmural (Q wave) infarction (acute) | | High lateral transmural (Q wave) infarction (acute) | | Lateral (wall) NOS transmural (Q wave) infarction (acute) | | Posterior (true) transmural (Q wave) infarction (acute) | | Posterobasal transmural (Q wave) infarction (acute) | | Posterolateral transmural (Q wave) infarction (acute) | | Posteroseptal transmural (Q wave) infarction (acute) | | Septal transmural (Q wave) infarction (acute) NOS |
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| I21.3 |
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ST elevation (STEMI) myocardial infarction of unspecified site |
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| Acute transmural myocardial infarction of unspecified site | | Transmural (Q wave) myocardial infarction NOS | | Type 1 ST elevation myocardial infarction of unspecified site |
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| I21.4 |
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Non-ST elevation (NSTEMI) myocardial infarction |
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| Acute subendocardial myocardial infarction | | Non-Q wave myocardial infarction NOS | | Nontransmural myocardial infarction NOS | | Type 1 non-ST elevation myocardial infarction |
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| I21.9 |
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Acute myocardial infarction, unspecified |
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| Myocardial infarction (acute) NOS |
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| I21.A |
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Other type of myocardial infarction |
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| I21.A1 |
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Myocardial infarction type 2 |
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| Myocardial infarction due to demand ischemia | | Myocardial infarction secondary to ischemic imbalance |
| CodeFirst |
the underlying cause, such as:
anemia (D50.0-D64.9)
chronic obstructive pulmonary disease (J44.-)
paroxysmal tachycardia (I47.0-I47.9)
shock (R57.0-R57.9)
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| I21.A9 |
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Other myocardial infarction type |
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| Myocardial infarction associated with revascularization procedure | | Myocardial infarction type 3 | | Myocardial infarction type 4a | | Myocardial infarction type 4b | | Myocardial infarction type 4c | | Myocardial infarction type 5 |
| CodeFirst |
, if applicable, postprocedural myocardial infarction following cardiac surgery (I97.190), or postprocedural myocardial infarction during cardiac surgery (I97.790)
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| CodeAlso |
complication, if known and applicable, such as:
(acute) stent occlusion (T82.897-)
(acute) stent stenosis (T82.855-)
(acute) stent thrombosis (T82.867-)
cardiac arrest due to underlying cardiac condition (I46.2)
complication of percutaneous coronary intervention (PCI) (I97.89)
occlusion of coronary artery bypass graft (T82.218-)
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| I21.B |
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Myocardial infarction with coronary microvascular dysfunction |
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| Myocardial infarction with coronary microvascular disease | | Myocardial infarction with nonobstructive coronary arteries [MINOCA] with microvascular disease |
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