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Diagnosis Code

I21.3 ST ELEVATION (STEMI) MYOCARDIAL INFARCTION OF UNSP SITE


Code Information

Diagnosis Code: I21.3

Short Description: ST elevation (STEMI) myocardial infarction of unsp site

Long Description: ST elevation (STEMI) myocardial infarction of unspecified site

The code I21.3 is VALID for claim submission

Code Classification:

  • Diseases of the circulatory system (I00–I99)
    • Ischemic heart diseases (I20-I25)
      • Acute myocardial infarction (I21)
        • I21.3 ST elevation (STEMI) myocardial infarction of unsp site

Code Version: 2022 ICD-10-CM


Synonyms

  • Acute myocardial infarction of apex of heart
  • Acute myocardial infarction of right ventricle
  • Acute Q wave infarction - widespread
  • Acute Q wave myocardial infarction
  • Acute ST segment elevation myocardial infarction
  • Acute ST segment elevation myocardial infarction of apex of heart
  • Acute ST segment elevation myocardial infarction of right ventricle
  • Acute widespread myocardial infarction

Diagnostic Related Group(s)

The code I21.3 is grouped in the following Diagnostic Related Group(s) (MS-DRG v39.0)
  • Acute Myocardial Infarction, Discharged Alive With Mcc (280)
  • Acute Myocardial Infarction, Discharged Alive With Cc (281)
  • Acute Myocardial Infarction, Discharged Alive Without Cc/mcc (282)
  • Acute Myocardial Infarction, Expired With Mcc (283)
  • Acute Myocardial Infarction, Expired With Cc (284)
  • Acute Myocardial Infarction, Expired Without Cc/mcc (285)

References to Index of Diseases and Injuries

The code I21.3 has the following ICD-10-CM references to the Index of Diseases and Injuries
  • Inclusion Terms:
    • Acute transmural myocardial infarction of unspecified site
    • Transmural (Q wave) myocardial infarction NOS
    • Type 1 ST elevation myocardial infarction of unspecified site

Crosswalk Information

ICD-10 Code ICD-9 Code ICD-9 Description
I21.3 Right Arrow 410.91 AMI NOS, initial

This ICD-10 to ICD-9 data is based on the 2018 General Equivalency Mapping (GEM) files published by the Centers for Medicare & Medicaid Services (CMS) for informational purposes only. The data is not an ICD-10 conversion tool and doesn’t guarantee clinical accuracy.

Similar Codes

ICD-10 Code ICD-10 Description
I21 Acute myocardial infarction
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
I21.4 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

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