I21.1

I21.1: ST elevation (STEMI) myocardial infarction of inferior wall

Non-billable headerICD-10-CM

I21.1 is a non-billable header ICD-10-CM code for st elevation (stemi) myocardial infarction of inferior wall. It cannot be billed on its own: choose one of the more specific child codes below.

Inclusion terms

Alternative wordings a physician may use in the chart for this same code.

Type 1 ST elevation myocardial infarction of inferior wall

Excludes2 inherited from the categories above I21.1

Not part of this code, but both may be coded when both are present.

Written on I21: Acute myocardial infarction

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

Other codes that can never be billed with I21.1

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

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 I21.1

2 child codes. Green means billable.