I21

I21: Acute myocardial infarction

Non-billable headerICD-10-CM

I21 is a non-billable header ICD-10-CM code for acute myocardial infarction. It cannot be billed on its own: choose one of the more specific child codes below.

Excludes2: not included here, but may coexist

The excluded condition is not part of this code, but a patient can have both. You may code both.

old myocardial infarction (I25.2)
postmyocardial infarction syndrome (I24.1)
subsequent type 1 myocardial infarction (I22.-)

Use additional code

Add a secondary code to capture the detail described below.

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)

Includes

Conditions this code covers.

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

Other codes that can never be billed with I21

Their own Excludes1 notes name this code, so the conflict is not listed above.

I22Subsequent ST elevation (STEMI) and non-ST elevation (NSTEMI) myocardial infarction
I24.8Other forms of acute ischemic heart disease
I25.82Chronic total occlusion of coronary artery
I5ANon-ischemic myocardial injury (non-traumatic)

Risk adjustment

No CMS-HCC V28 category: this code does not change a RAF score.

Code history

Unchanged in every release from FY2024 to FY2027.

Code to one of these instead I21

8 child codes. Green means billable.