2021 ICD-10-CM Codes for Acute myocardial infarction (I21)

Instructional Notations

Includes Includes
This note appears immediately under a three character code title to further define, or give examples of, the content of the category.

  • 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

Use Additional Code Use Additional Code
The “use additional code” indicates that a secondary code could be used to further specify the patient’s condition. This note is not mandatory and is only used if enough information is available to assign an additional code.

  • code, if applicable, to identify:
  • exposure to environmental tobacco smoke Z77.22
  • history of tobacco dependence Z87.891
  • occupational exposure to environmental tobacco smoke Z57.31
  • status post administration of tPA rtPA in a different facility within the last 24 hours prior to admission to current facility Z92.82
  • tobacco dependence F17
  • tobacco use Z72.0

Type 2 Excludes Type 2 Excludes
A type 2 excludes note represents "Not included here". An excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time. When an Excludes2 note appears under a code, it is acceptable to use both the code and the excluded code together, when appropriate.

  • old myocardial infarction I25.2
  • postmyocardial infarction syndrome I24.1
  • subsequent type 1 myocardial infarction I22
    • ICD-10 Index

      • Diseases of the circulatory system (I00–I99)

        • Ischemic heart diseases (I20-I25)

            • Acute myocardial infarction (I21)
            • I21 - Acute myocardial infarction NON-BILLABLE CODE
            • I21.0 - ST elevation (STEMI) myocardial infarction of anterior wall NON-BILLABLE CODE
            • I21.01 - STEMI involving left main coronary artery BILLABLE CODE
            • I21.02 - STEMI involving left anterior descending coronary artery BILLABLE CODE
            • I21.09 - STEMI involving oth coronary artery of anterior wall BILLABLE CODE
            • I21.1 - ST elevation (STEMI) myocardial infarction of inferior wall NON-BILLABLE CODE
            • I21.11 - STEMI involving right coronary artery BILLABLE CODE
            • I21.19 - STEMI involving oth coronary artery of inferior wall BILLABLE CODE
            • I21.2 - ST elevation (STEMI) myocardial infarction of other sites NON-BILLABLE CODE
            • I21.21 - STEMI involving left circumflex coronary artery BILLABLE CODE
            • I21.29 - STEMI involving oth sites BILLABLE CODE
            • I21.3 - ST elevation (STEMI) myocardial infarction of unsp site BILLABLE CODE
            • I21.4 - Non-ST elevation (NSTEMI) myocardial infarction BILLABLE CODE
            • I21.9 - Acute myocardial infarction, unspecified BILLABLE CODE
            • I21.A - Other type of myocardial infarction NON-BILLABLE CODE
            • I21.A1 - Myocardial infarction type 2 BILLABLE CODE
            • I21.A9 - Other myocardial infarction type BILLABLE CODE