I21 ACUTE MYOCARDIAL INFARCTION

Code Information

Diagnosis Code: I21

Short Description: Acute myocardial infarction

Long Description: Acute myocardial infarction

The code I21 is NOT VALID for claim submission

Code Classification:

Diseases of the circulatory system (I00–I99)
- Ischemic heart diseases (I20-I25)
  - Acute myocardial infarction (I21)
    - I21 Acute myocardial infarction

Code Version: 2022 ICD-10-CM

The code I21 has the following ICD-10-CM references to the Index of Diseases and Injuries

Includes Notes:
- cardiac infarction
- coronary (artery) embolism
- coronary (artery) occlusion
- coronary (artery) rupture
- coronary (artery) thrombosis
- infarction of heart, myocardium, or ventricle
- myocardial infarction specified as acute or with a stated duration of 4 weeks (28 days) or less from onset
Type 2 Excludes Notes:
- old myocardial infarction (@I25.2*)
- postmyocardial infarction syndrome (@I24.1*)
- subsequent type 1 myocardial infarction (@I22*.-)

ICD-10 Code	ICD-10 Description
I21.0	ST elevation (STEMI) myocardial infarction of anterior wall
I21.01	ST elevation (STEMI) myocardial infarction involving left main coronary artery
I21.02	ST elevation (STEMI) myocardial infarction involving left anterior descending coronary artery
I21.09	ST elevation (STEMI) myocardial infarction involving other coronary artery of anterior wall
I21.1	ST elevation (STEMI) myocardial infarction of inferior wall
I21.11	ST elevation (STEMI) myocardial infarction involving right coronary artery
I21.19	ST elevation (STEMI) myocardial infarction involving other coronary artery of inferior wall
I21.2	ST elevation (STEMI) myocardial infarction of other sites
I21.21	ST elevation (STEMI) myocardial infarction involving left circumflex coronary artery
I21.29	ST elevation (STEMI) myocardial infarction involving other sites
I21.3	ST elevation (STEMI) myocardial infarction of unspecified site
I21.4	Non-ST elevation (NSTEMI) myocardial infarction
I21.9	Acute myocardial infarction, unspecified
I21.A	Other type of myocardial infarction
I21.A1	Myocardial infarction type 2
I21.A9	Other myocardial infarction type
I21.B	Myocardial infarction with coronary microvascular dysfunction

This page was last updated on: 10/1/2023