DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Category · FY2027

I23 Certain current complications following ST elevation (STEMI) and non-ST elevation (NSTEMI) myocardial infarction (within the 28 day period)

  • Header · not billable

I23 is not billable. The category heads 9 billable codes in FY2027: the 9 codes directly below it.

Index → code

  • Rupture, rupturedcardiac (auricle) (ventricle) (wall) → I23.3
  • Hemopericardiumfollowing acute myocardial infarction (current complication) → I23.0
  • Angina (attack) (cardiac) (chest) (heart) (pectoris) (syndrome) (vasomotor)post-infarctional → I23.7

Where it sits

  1. Chapter 9 Diseases of the circulatory system (I00-I99)
  2. I20-I25 Ischemic heart diseases (I20-I25)
  3. I23 Certain current complications following ST elevation (STEMI) and non-ST elevation (NSTEMI) myocardial infarction (within the 28 day period)
Billable codes
9
Subdivisions
9
CC / MCC codes
7 / 2
HCC V28 codes
9
New FY2027
0
Index entries
34

Codes in I23

  1. I23.0
    Hemopericardium as current complication following acute myocardial infarction
    BillableCC229
    Excludes1 1

    Excludes1

    • hemopericardium not specified as current complication following acute myocardial infarction (I31.2) I31.2
  2. I23.1
    Atrial septal defect as current complication following acute myocardial infarction
    BillableCC229
    Excludes1 1

    Excludes1

    • acquired atrial septal defect not specified as current complication following acute myocardial infarction (I51.0) I51.0
  3. I23.2
    Ventricular septal defect as current complication following acute myocardial infarction
    BillableCC229
    Excludes1 1

    Excludes1

    • acquired ventricular septal defect not specified as current complication following acute myocardial infarction (I51.0) I51.0
  4. I23.3
    Rupture of cardiac wall without hemopericardium as current complication following acute myocardial infarction
    BillableCC229
  5. I23.4
    Rupture of chordae tendineae as current complication following acute myocardial infarction
    BillableMCC229
    Excludes1 1

    Excludes1

    • rupture of chordae tendineae not specified as current complication following acute myocardial infarction (I51.1) I51.1
  6. I23.5
    Rupture of papillary muscle as current complication following acute myocardial infarction
    BillableMCC229
    Excludes1 1

    Excludes1

    • rupture of papillary muscle not specified as current complication following acute myocardial infarction (I51.2) I51.2
  7. I23.6
    Thrombosis of atrium, auricular appendage, and ventricle as current complications following acute myocardial infarction
    BillableCC229
    Excludes1 1

    Excludes1

    • thrombosis of atrium, auricular appendage, and ventricle not specified as current complication following acute myocardial infarction (I51.3) I51.3
  8. I23.7
    Postinfarction angina
    BillableCC229
  9. I23.8
    Other current complications following acute myocardial infarction
    BillableCC229

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

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

  • Hemopericardiumfollowing acute myocardial infarction (current complication) → I23.0
  • Rupture, rupturedcardiac (auricle) (ventricle) (wall) → I23.3
  • Angina (attack) (cardiac) (chest) (heart) (pectoris) (syndrome) (vasomotor)following acute myocardial infarction → I23.7
  • Angina (attack) (cardiac) (chest) (heart) (pectoris) (syndrome) (vasomotor)post-infarctional → I23.7
  • Rupture, rupturedcardiac (auricle) (ventricle) (wall)with hemopericardium → I23.0
  • Defect, defectiveatrial septalfollowing acute myocardial infarction (current complication) → I23.1
  • Defect, defectiveventricular septalfollowing acute myocardial infarction (current complication) → I23.2
  • Lacerationchordae tendinae NECfollowing acute myocardial infarction (current complication) → I23.4
  • Rupture, rupturedchordae tendineae NECfollowing acute myocardial infarction (current complication) → I23.4
  • Rupture, rupturedpapillary muscle NECfollowing acute myocardial infarction (current complication) → I23.5
  • Thrombosis, thrombotic (bland) (multiple) (progressive) (silent) (vessel)atrium, auricularfollowing acute myocardial infarction (current complication) → I23.6
  • Thrombosis, thrombotic (bland) (multiple) (progressive) (silent) (vessel)ventriclefollowing acute myocardial infarction (current complication) → I23.6
  • Complication(s) (from) (of)followingacute myocardial infarction NEC → I23.8
  • Complication(s) (from) (of)followingacute myocardial infarction NEChemopericardium → I23.0
  • Defect, defectiveseptal (heart) NOSatrialfollowing acute myocardial infarction (current complication) → I23.1
  • Complication(s) (from) (of)followingacute myocardial infarction NECaneurysm (false) (of cardiac wall) (of heart wall) (ruptured) → I23.3
  • Complication(s) (from) (of)followingacute myocardial infarction NECcardiac wall rupture → I23.3
  • Complication(s) (from) (of)followingacute myocardial infarction NECchordae tendinae rupture → I23.4
  • Complication(s) (from) (of)followingacute myocardial infarction NECpapillary muscle rupture → I23.5
  • Complication(s) (from) (of)followingacute myocardial infarction NECangina → I23.7
  • Complication(s) (from) (of)followingacute myocardial infarction NECspecified NEC → I23.8
  • Complication(s) (from) (of)followingacute myocardial infarction NECatrialseptal defect → I23.1
  • Complication(s) (from) (of)followingacute myocardial infarction NECventricularseptal defect → I23.2
  • Complication(s) (from) (of)followingacute myocardial infarction NECrupturecardiac wall → I23.3
  • Complication(s) (from) (of)followingacute myocardial infarction NECrupturechordae tendineae → I23.4
  • Complication(s) (from) (of)followingacute myocardial infarction NECrupturepapillary muscle → I23.5
  • Complication(s) (from) (of)followingacute myocardial infarction NECatrialthrombosis → I23.6
  • Complication(s) (from) (of)followingacute myocardial infarction NECthrombosisatrium → I23.6
  • Complication(s) (from) (of)followingacute myocardial infarction NECthrombosisauricular appendage → I23.6
  • Complication(s) (from) (of)followingacute myocardial infarction NECthrombosisventricle (heart) → I23.6
  • Complication(s) (from) (of)followingacute myocardial infarction NECventricularthrombosis → I23.6
  • Complication(s) (from) (of)followingacute myocardial infarction NECrupturecardiac wallwith hemopericardium → I23.0
  • Complication(s) (from) (of)followingacute myocardial infarction NECdefectseptalatrial (heart) → I23.1
  • Complication(s) (from) (of)followingacute myocardial infarction NECdefectseptalventricular (heart) → I23.2

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

Hierarchy