DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Category · FY2027

I22 Subsequent ST elevation (STEMI) and non-ST elevation (NSTEMI) myocardial infarction

  • Header · not billable

I22 is not billable. The category heads 5 billable codes in FY2027: the 5 codes directly below it.

Index → code

  • Infarct, infarctionmyocardium, myocardial (acute) (with stated duration of 4 weeks or less)subsequent (recurrent) (reinfarction) → I22.9
  • Infarct, infarctionmyocardium, myocardial (acute) (with stated duration of 4 weeks or less)ST elevation (STEMI)subsequent → I22.9
  • Infarct, infarctionmyocardium, myocardial (acute) (with stated duration of 4 weeks or less)non-ST elevation (NSTEMI)subsequent → I22.2

Where it sits

  1. Chapter 9 Diseases of the circulatory system (I00-I99)
  2. I20-I25 Ischemic heart diseases (I20-I25)
  3. I22 Subsequent ST elevation (STEMI) and non-ST elevation (NSTEMI) myocardial infarction
Billable codes
5
Subdivisions
5
CC / MCC codes
0 / 5
HCC V28 codes
5
New FY2027
0
Index entries
30

Codes in I22

  1. I22.0
    Subsequent ST elevation (STEMI) myocardial infarction of anterior wall
    BillableMCC228
    Inclusion terms 5

    Inclusion terms

    • Subsequent acute transmural myocardial infarction of anterior wall
    • Subsequent transmural (Q wave) infarction (acute)(of) anterior (wall) NOS
    • Subsequent anteroapical transmural (Q wave) infarction (acute)
    • Subsequent anterolateral transmural (Q wave) infarction (acute)
    • Subsequent anteroseptal transmural (Q wave) infarction (acute)
  2. I22.1
    Subsequent ST elevation (STEMI) myocardial infarction of inferior wall
    BillableMCC228
    Inclusion terms 5

    Inclusion terms

    • Subsequent acute transmural myocardial infarction of inferior wall
    • Subsequent transmural (Q wave) infarction (acute)(of) diaphragmatic wall
    • Subsequent transmural (Q wave) infarction (acute)(of) inferior (wall) NOS
    • Subsequent inferolateral transmural (Q wave) infarction (acute)
    • Subsequent inferoposterior transmural (Q wave) infarction (acute)
  3. I22.2
    Subsequent non-ST elevation (NSTEMI) myocardial infarction
    BillableMCC228
    Inclusion terms 3

    Inclusion terms

    • Subsequent acute subendocardial myocardial infarction
    • Subsequent non-Q wave myocardial infarction NOS
    • Subsequent nontransmural myocardial infarction NOS
  4. I22.8
    Subsequent ST elevation (STEMI) myocardial infarction of other sites
    BillableMCC228
    Inclusion terms 10

    Inclusion terms

    • Subsequent acute transmural myocardial infarction of other sites
    • Subsequent apical-lateral transmural (Q wave) myocardial infarction (acute)
    • Subsequent basal-lateral transmural (Q wave) myocardial infarction (acute)
    • Subsequent high lateral transmural (Q wave) myocardial infarction (acute)
    • Subsequent transmural (Q wave) myocardial infarction (acute)(of) lateral (wall) NOS
    • Subsequent posterior (true) transmural (Q wave) myocardial infarction (acute)
    • Subsequent posterobasal transmural (Q wave) myocardial infarction (acute)
    • Subsequent posterolateral transmural (Q wave) myocardial infarction (acute)
    • Subsequent posteroseptal transmural (Q wave) myocardial infarction (acute)
    • Subsequent septal NOS transmural (Q wave) myocardial infarction (acute)
  5. I22.9
    Subsequent ST elevation (STEMI) myocardial infarction of unspecified site
    BillableMCC228
    Inclusion terms 2

    Inclusion terms

    • Subsequent acute myocardial infarction of unspecified site
    • Subsequent myocardial infarction (acute) NOS

CC/MCC: as a secondary diagnosis, unless the principal diagnosis is on the code’s PDX exclusion list (MS-DRG v44 Appendix C; list on the code card).

Sources of each column.

Instructions

At I22

Includes

  • acute myocardial infarction occurring within four weeks (28 days) of a previous acute myocardial infarction, regardless of site
  • cardiac infarction
  • coronary (artery) embolism
  • coronary (artery) occlusion
  • coronary (artery) rupture
  • coronary (artery) thrombosis
  • infarction of heart, myocardium, or ventricle
  • recurrent myocardial infarction
  • reinfarction of myocardium
  • rupture of heart, myocardium, or ventricle
  • subsequent type 1 myocardial infarction

Excludes1

  • subsequent myocardial infarction, type 2 (I21.A1) I21.A1
  • subsequent myocardial infarction of other type (type 3) (type 4) (type 5) (I21.A9) I21.A9

Use additional code

  • code, if applicable, to identify:
  • exposure to environmental tobacco smoke (Z77.22) Z77.22
  • history of tobacco dependence (Z87.891) Z87.891
  • occupational exposure to environmental tobacco smoke (Z57.31) 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) Z92.82
  • tobacco dependence (F17.-) F17
  • tobacco use (Z72.0) Z72.0

Notes that also apply

Block I20-I25 instructions (Code also 1): printed on the block page.

Chapter 9 instructions (Excludes2 10): printed on the chapter 9 page.

Index entries

  • Infarct, infarctionmyocardium, myocardial (acute) (with stated duration of 4 weeks or less)subsequent (recurrent) (reinfarction) → I22.9
  • Infarct, infarctionmyocardium, myocardial (acute) (with stated duration of 4 weeks or less)subsequent (recurrent) (reinfarction)anterior (anteroapical) (anterolateral) (anteroseptal) (wall) → I22.0
  • Infarct, infarctionmyocardium, myocardial (acute) (with stated duration of 4 weeks or less)subsequent (recurrent) (reinfarction)diaphragmatic (wall) → I22.1
  • Infarct, infarctionmyocardium, myocardial (acute) (with stated duration of 4 weeks or less)subsequent (recurrent) (reinfarction)inferior (diaphragmatic) (inferolateral) (inferoposterior) (wall) → I22.1
  • Infarct, infarctionmyocardium, myocardial (acute) (with stated duration of 4 weeks or less)non-ST elevation (NSTEMI)subsequent → I22.2
  • Infarct, infarctionmyocardium, myocardial (acute) (with stated duration of 4 weeks or less)subsequent (recurrent) (reinfarction)non-ST elevation (NSTEMI) → I22.2
  • Infarct, infarctionmyocardium, myocardial (acute) (with stated duration of 4 weeks or less)subsequent (recurrent) (reinfarction)subendocardial → I22.2
  • Infarct, infarctionmyocardium, myocardial (acute) (with stated duration of 4 weeks or less)subsequent (recurrent) (reinfarction)lateral (apical-lateral) (basal-lateral) (high) → I22.8
  • Infarct, infarctionmyocardium, myocardial (acute) (with stated duration of 4 weeks or less)subsequent (recurrent) (reinfarction)posterior (posterobasal) (posterolateral) (posteroseptal) (true) → I22.8
  • Infarct, infarctionmyocardium, myocardial (acute) (with stated duration of 4 weeks or less)subsequent (recurrent) (reinfarction)septal → I22.8
  • Infarct, infarctionmyocardium, myocardial (acute) (with stated duration of 4 weeks or less)subsequent (recurrent) (reinfarction)specified NEC → I22.8
  • Infarct, infarctionmyocardium, myocardial (acute) (with stated duration of 4 weeks or less)ST elevation (STEMI)subsequent → I22.9
  • Infarct, infarctionmyocardium, myocardial (acute) (with stated duration of 4 weeks or less)subsequent (recurrent) (reinfarction)ST elevation → I22.9
  • Infarct, infarctionmyocardium, myocardial (acute) (with stated duration of 4 weeks or less)subsequent (recurrent) (reinfarction)transmural → I22.9
  • Infarct, infarctionmyocardium, myocardial (acute) (with stated duration of 4 weeks or less)subsequent (recurrent) (reinfarction)type 1 → I22.9
  • Infarct, infarctionmyocardium, myocardial (acute) (with stated duration of 4 weeks or less)ST elevation (STEMI)anterior (anteroapical) (anterolateral) (anteroseptal) (Q wave) (wall)subsequent → I22.0
  • Infarct, infarctionmyocardium, myocardial (acute) (with stated duration of 4 weeks or less)subsequent (recurrent) (reinfarction)ST elevationanterior (anteroapical) (anterolateral) (anteroseptal) (wall) → I22.0
  • Infarct, infarctionmyocardium, myocardial (acute) (with stated duration of 4 weeks or less)subsequent (recurrent) (reinfarction)transmuralanterior (anteroapical) (anterolateral) (anteroseptal) (wall) → I22.0
  • Infarct, infarctionmyocardium, myocardial (acute) (with stated duration of 4 weeks or less)ST elevation (STEMI)inferior (diaphragmatic) (inferolateral) (inferoposterior) (wall) NECsubsequent → I22.1
  • Infarct, infarctionmyocardium, myocardial (acute) (with stated duration of 4 weeks or less)subsequent (recurrent) (reinfarction)ST elevationinferior (diaphragmatic) (inferolateral) (inferoposterior) (wall) → I22.1
  • Infarct, infarctionmyocardium, myocardial (acute) (with stated duration of 4 weeks or less)subsequent (recurrent) (reinfarction)transmuraldiaphragmatic (wall) → I22.1
  • Infarct, infarctionmyocardium, myocardial (acute) (with stated duration of 4 weeks or less)subsequent (recurrent) (reinfarction)transmuralinferior (diaphragmatic) (inferolateral) (inferoposterior) (wall) → I22.1
  • Infarct, infarctionmyocardium, myocardial (acute) (with stated duration of 4 weeks or less)ST elevation (STEMI)lateral (apical-lateral) (basal-lateral) (high)subsequent → I22.8
  • Infarct, infarctionmyocardium, myocardial (acute) (with stated duration of 4 weeks or less)ST elevation (STEMI)posterior (posterobasal) (posterolateral) (posteroseptal) (true)subsequent → I22.8
  • Infarct, infarctionmyocardium, myocardial (acute) (with stated duration of 4 weeks or less)ST elevation (STEMI)septalsubsequent → I22.8
  • Infarct, infarctionmyocardium, myocardial (acute) (with stated duration of 4 weeks or less)ST elevation (STEMI)specified NECsubsequent → I22.8
  • Infarct, infarctionmyocardium, myocardial (acute) (with stated duration of 4 weeks or less)subsequent (recurrent) (reinfarction)ST elevationspecified NEC → I22.8
  • Infarct, infarctionmyocardium, myocardial (acute) (with stated duration of 4 weeks or less)subsequent (recurrent) (reinfarction)transmurallateral (apical-lateral) (basal-lateral) (high) → I22.8
  • Infarct, infarctionmyocardium, myocardial (acute) (with stated duration of 4 weeks or less)subsequent (recurrent) (reinfarction)transmuralposterior (posterobasal) (posterolateral) (posteroseptal) (true) → I22.8
  • Infarct, infarctionmyocardium, myocardial (acute) (with stated duration of 4 weeks or less)subsequent (recurrent) (reinfarction)transmuralspecified NEC → I22.8

NCHS Alphabetic Index. Index first, then the Tabular List.

Hierarchy