I21.B
Myocardial infarction with coronary microvascular dysfunction
- Release
- FY 2027
- Effective
Hierarchy
Where I21.B sits in the official hierarchy. Each level is the code it is classified under.
- I21 Parent Acute myocardial infarction
- I21.B This code Myocardial infarction with coronary microvascular dysfunction
Official Coding Notes
Reproduced verbatim from the FY 2027 ICD-10-CM files. Notes labelled as inherited are declared on a parent code and apply here too.
Includes
infarction of heart, myocardium, or ventricle
Inherited from I21 — Acute myocardial infarction
Includes
myocardial infarction specified as acute or with a stated duration of 4 weeks (28 days) or less from onset
Inherited from I21 — Acute myocardial infarction
Inclusion Terms
Myocardial infarction with coronary microvascular disease
Inclusion Terms
Myocardial infarction with nonobstructive coronary arteries [MINOCA] with microvascular disease
Use Additional Code
code, if applicable, to identify:
Inherited from I21 — Acute myocardial infarction
Use Additional Code
exposure to environmental tobacco smoke ( Z77.22 )
Inherited from I21 — Acute myocardial infarction
Use Additional Code
history of tobacco dependence ( Z87.891 )
Inherited from I21 — Acute myocardial infarction
Use Additional Code
occupational exposure to environmental tobacco smoke ( Z57.31 )
Inherited from I21 — Acute myocardial infarction
Version History
How I21.B appears in each release imported from the official files, newest first.
-
FY 2027 Effective
CurrentMyocardial infarction with coronary microvascular dysfunction
-
FY 2026 Effective
UnchangedMyocardial infarction with coronary microvascular dysfunction
Related Codes
Other codes under I21
- I21.0 ST elevation (STEMI) myocardial infarction of anterior wall
- I21.1 ST elevation (STEMI) myocardial infarction of inferior wall
- I21.2 ST elevation (STEMI) myocardial infarction of other sites
- I21.3 ST elevation (STEMI) myocardial infarction of unspecified site Billable
- I21.4 Non-ST elevation (NSTEMI) myocardial infarction Billable
- I21.9 Acute myocardial infarction, unspecified Billable
- I21.A Other type of myocardial infarction
Data Source
Code information on this page is derived from the FY 2027 ICD-10-CM files published by CDC NCHS and CMS.
- Release
- FY 2027
- Effective
- Source file
- icd10cm-code-descriptions-2027.zip
Official ICD-10-CM source files (opens in a new tab)
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