I21.B
ICD-10BillableMyocardial infarction with coronary microvascular dysfnct
Official ICD-10-CM descriptor (FY2026)
Myocardial infarction with coronary microvascular dysfunction
I21.B is valid for submission on a claim — CMS flags it as a billable, specific code.
Inclusion terms
- Myocardial infarction with coronary microvascular disease
- Myocardial infarction with nonobstructive coronary arteries [MINOCA] with microvascular disease
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
- I21.9Acute myocardial infarction, unspecified
- I21.AOther type of myocardial infarctioncategory
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.