I21.9
ICD-10BillableAcute myocardial infarction, unspecified
Official ICD-10-CM descriptor (FY2026)
Acute myocardial infarction, unspecified
I21.9 is valid for submission on a claim — CMS flags it as a billable, specific code.
Inclusion terms
- Myocardial infarction (acute) NOS
Related codes in I21
- I21.0ST elevation (STEMI) myocardial infarction of anterior wallcategory
- I21.1ST elevation (STEMI) myocardial infarction of inferior 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.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.