I21.1
ICD-10Non-billable categoryST elevation (STEMI) myocardial infarction of inferior wall
Official ICD-10-CM descriptor (FY2026)
ST elevation (STEMI) myocardial infarction of inferior wall
I21.1 is a category heading, not a billable code. CMS does not accept it on a claim; report one of the more specific codes beneath it.
Inclusion terms
- Type 1 ST elevation myocardial infarction of inferior wall
ICD-10-CM FY2026 defines 2 codes beneath I21.1. See the ICD-10-CM index for what this site publishes.
Related codes in I21
- I21.0ST elevation (STEMI) myocardial infarction of anterior wallcategory
- I21.2ST elevation (STEMI) myocardial infarction of other sitescategory
- I21.3ST elevation (STEMI) myocardial infarction of unsp site
- I21.4Non-ST elevation (NSTEMI) myocardial infarction
- I21.9Acute myocardial infarction, unspecified
- I21.AOther type of myocardial infarctioncategory
- I21.BMyocardial infarction with coronary microvascular dysfnct
Where this code sits
- Parent code
- I21
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ICD-10-CM FY2026. Centers for Medicare & Medicaid Services (CMS) / National Center for Health Statistics (NCHS), “2026 ICD-10-CM Code Descriptions in Tabular Order” (icd10cm_order_2026.txt). Download the original file from cms.gov. Public domain (US Government work). Descriptors, billable flags and instructional notes on this page are reproduced from that file without modification. Krasyn adds no clinical guidance.