Use Additional code to identify presence of hypertension (I10-I16)

  1. I21 Acute myocardial infarction

    Use Additional 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)

    Includes:

    • 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

    Excludes2

    • old myocardial infarction (I25.2)
    • postmyocardial infarction syndrome (I24.1)
    • subsequent type 1 myocardial infarction (I22.-)
    1. I21.0 ST elevation (STEMI) myocardial infarction of anterior wall

      Inclusion term(s):

      • Type 1 ST elevation myocardial infarction of anterior wall
      1. I21.01 ST elevation (STEMI) myocardial infarction involving left main coronary artery

      2. I21.02 ST elevation (STEMI) myocardial infarction involving left anterior descending coronary artery

        Inclusion term(s):

        • ST elevation (STEMI) myocardial infarction involving diagonal coronary artery
      3. I21.09 ST elevation (STEMI) myocardial infarction involving other coronary artery of anterior wall

        Inclusion term(s):

        • Acute transmural myocardial infarction of anterior wall
        • Anteroapical transmural (Q wave) infarction (acute)
        • Anterolateral transmural (Q wave) infarction (acute)
        • Anteroseptal transmural (Q wave) infarction (acute)
        • Transmural (Q wave) infarction (acute) (of) anterior (wall) NOS
    2. I21.1 ST elevation (STEMI) myocardial infarction of inferior wall

      Inclusion term(s):

      • Type 1 ST elevation myocardial infarction of inferior wall
      1. I21.11 ST elevation (STEMI) myocardial infarction involving right coronary artery

        Inclusion term(s):

        • Inferoposterior transmural (Q wave) infarction (acute)
      2. I21.19 ST elevation (STEMI) myocardial infarction involving other coronary artery of inferior wall

        Inclusion term(s):

        • Acute transmural myocardial infarction of inferior wall
        • Inferolateral transmural (Q wave) infarction (acute)
        • Transmural (Q wave) infarction (acute) (of) diaphragmatic wall
        • Transmural (Q wave) infarction (acute) (of) inferior (wall) NOS
    3. I21.2 ST elevation (STEMI) myocardial infarction of other sites

      Inclusion term(s):

      • Type 1 ST elevation myocardial infarction of other sites
      1. I21.21 ST elevation (STEMI) myocardial infarction involving left circumflex coronary artery

        Inclusion term(s):

        • ST elevation (STEMI) myocardial infarction involving oblique marginal coronary artery
      2. I21.29 ST elevation (STEMI) myocardial infarction involving other sites

        Inclusion term(s):

        • Acute transmural myocardial infarction of other sites
        • Apical-lateral transmural (Q wave) infarction (acute)
        • Basal-lateral transmural (Q wave) infarction (acute)
        • High lateral transmural (Q wave) infarction (acute)
        • Lateral (wall) NOS transmural (Q wave) infarction (acute)
        • Posterior (true) transmural (Q wave) infarction (acute)
        • Posterobasal transmural (Q wave) infarction (acute)
        • Posterolateral transmural (Q wave) infarction (acute)
        • Posteroseptal transmural (Q wave) infarction (acute)
        • Septal transmural (Q wave) infarction (acute) NOS
    4. I21.3 ST elevation (STEMI) myocardial infarction of unspecified site

      Inclusion term(s):

      • Acute transmural myocardial infarction of unspecified site
      • Transmural (Q wave) myocardial infarction NOS
      • Type 1 ST elevation myocardial infarction of unspecified site
    5. I21.4 Non-ST elevation (NSTEMI) myocardial infarction

      Inclusion term(s):

      • Acute subendocardial myocardial infarction
      • Non-Q wave myocardial infarction NOS
      • Nontransmural myocardial infarction NOS
      • Type 1 non-ST elevation myocardial infarction
    6. I21.9 Acute myocardial infarction, unspecified

      Inclusion term(s):

      • Myocardial infarction (acute) NOS
    7. I21.A Other type of myocardial infarction

      1. I21.A1 Myocardial infarction type 2

        Inclusion term(s):

        • Myocardial infarction due to demand ischemia
        • Myocardial infarction secondary to ischemic imbalance
      2. I21.A9 Other myocardial infarction type

        Inclusion term(s):

        • Myocardial infarction associated with revascularization procedure
        • Myocardial infarction type 3
        • Myocardial infarction type 4a
        • Myocardial infarction type 4b
        • Myocardial infarction type 4c
        • Myocardial infarction type 5
Abbreviations used here:

NEC Not elsewhere classifiable
This abbreviation in the Tabular List represents “other specified”. When a specific code is not available for a condition, the Tabular List includes an NEC entry under a code to identify the code as the “other specified” code.

NOS Not otherwise specified
This abbreviation is the equivalent of unspecified.