I21.0 — ST elevation (STEMI) myocardial infarction of anterior wall
I21.0 is a non-billable header ICD-10-CM code for st elevation (stemi) myocardial infarction of anterior 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 anterior wall
Other codes that can never be billed with I21.0
These codes carry an Excludes1 note pointing at I21.0. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading I21.0 alone.
- I25.82Chronic total occlusion of coronary artery
Risk adjustment
I21.0 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.
Code to one of these instead I21.0
3 child codes. Green means billable.
Related codes at this level
Codes that share I21. If I21.0 is not quite right, the correct code is usually one of these.
- 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
- I21.4Non-ST elevation (NSTEMI) myocardial infarction
- I21.9Acute myocardial infarction, unspecified
- I21.AOther type of myocardial infarction
- I21.BMyocardial infarction with coronary microvascular dysfunction
Questions about I21.0
- Is I21.0 a billable ICD-10-CM code?
- No. I21.0 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
- Where does I21.0 sit in the tabular list?
- Diseases of the circulatory system (I00-I99), in the block Ischemic heart diseases (I20-I25).