Category: I21 - Acute myocardial infarction

 Chapter Notes

 Section Notes

 I21

Acute myocardial infarction

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

Use additional 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)

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

Type 1 ST elevation myocardial infarction of anterior wall

 I21.01

ST elevation (STEMI) myocardial infarction involving left main coronary artery

 I21.02

ST elevation (STEMI) myocardial infarction involving left anterior descending coronary artery

ST elevation (STEMI) myocardial infarction involving diagonal coronary artery

 I21.09

ST elevation (STEMI) myocardial infarction involving other coronary artery of anterior wall

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

 I21.1

ST elevation (STEMI) myocardial infarction of inferior wall

Type 1 ST elevation myocardial infarction of inferior wall

 I21.11

ST elevation (STEMI) myocardial infarction involving right coronary artery

Inferoposterior transmural (Q wave) infarction (acute)

 I21.19

ST elevation (STEMI) myocardial infarction involving other coronary artery of inferior wall

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

ST elevation (STEMI) myocardial infarction involving left circumflex coronary artery (I21.21)

 I21.2

ST elevation (STEMI) myocardial infarction of other sites

Type 1 ST elevation myocardial infarction of other sites

 I21.21

ST elevation (STEMI) myocardial infarction involving left circumflex coronary artery

ST elevation (STEMI) myocardial infarction involving oblique marginal coronary artery

 I21.29

ST elevation (STEMI) myocardial infarction involving other sites

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

 I21.3

ST elevation (STEMI) myocardial infarction of unspecified site

Acute transmural myocardial infarction of unspecified site

Transmural (Q wave) myocardial infarction NOS

Type 1 ST elevation myocardial infarction of unspecified site

 I21.4

Non-ST elevation (NSTEMI) myocardial infarction

Acute subendocardial myocardial infarction

Non-Q wave myocardial infarction NOS

Nontransmural myocardial infarction NOS

Type 1 non-ST elevation myocardial infarction

 I21.9

Acute myocardial infarction, unspecified

Myocardial infarction (acute) NOS

 I21.A

Other type of myocardial infarction

 I21.A1

Myocardial infarction type 2

Myocardial infarction due to demand ischemia

Myocardial infarction secondary to ischemic imbalance

Code first 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)

 I21.A9

Other myocardial infarction type

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

Code first, if applicable, postprocedural myocardial infarction following cardiac surgery (I97.190), or postprocedural myocardial infarction during cardiac surgery (I97.790)

Code also 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-)

 I21.B

Myocardial infarction with coronary microvascular dysfunction

Myocardial infarction with coronary microvascular disease

Myocardial infarction with nonobstructive coronary arteries [MINOCA] with microvascular disease