I21 is the ICD-10 code for Acute myocardial infarction. It is a three-character category divided into 6 subcodes; use the subcode whenever the record supports that level of detail. It belongs to the block I20–I25 (Ischaemic heart diseases) in Chapter IX, Diseases of the circulatory system.
- Code type
- Category (3 characters)
- Chapter
- IX · I00–I99
- Classification
- WHO ICD-10, 2019 version
What I21 includes
Conditions and terms that are coded here.
- myocardial infarction specified as acute or with a stated duration of 4 weeks (28 days) or less from onset
What I21 excludes
Conditions that look similar but belong under another code.
Subcodes of I21
- I21.0Acute transmural myocardial infarction of anterior wall
- I21.1Acute transmural myocardial infarction of inferior wall
- I21.2Acute transmural myocardial infarction of other sites
- I21.3Acute transmural myocardial infarction of unspecified site
- I21.4Acute subendocardial myocardial infarction
- I21.9Acute myocardial infarction, unspecified
I21 in national editions
Countries report with their own edition of ICD-10. Most keep the WHO code and add more specific codes beneath it.
DI21Akut myokardieinfarkt
I21Sydäninfarkti
I21Akuter Myokardinfarkt
I21Infarctus aigu du myocarde
I21acuut myocardinfarct
Listed through more specific codes:
- I21.BMyocardial infarction with coronary microvascular dysfunction
Based on the World Health Organization’s International Statistical Classification of Diseases and Related Health Problems, 10th revision (ICD-10), 2019 version, and the national editions published by each country’s health authority. This page is a reference, not coding advice; follow your national coding rules when you report.
Look up another code
Stop looking codes up by hand
Docdemic listens to the consultation, writes the note and suggests the diagnosis and procedure codes that fit it, each one checked against your country’s official code list.
Try Docdemic free