DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Category · FY2027

I40 Acute myocarditis

  • Header · not billable

I40 is not billable. The category heads 4 billable codes in FY2027: the 4 codes directly below it.

Index → code

  • Abramov-Fiedler myocarditis (acute isolated myocarditis) → I40.1
  • SyndromeFiedler's → I40.1
  • Fiedler'smyocarditis (acute) → I40.1

Where it sits

  1. Chapter 9 Diseases of the circulatory system (I00-I99)
  2. I30-I5A Other forms of heart disease (I30-I5A)
  3. I40 Acute myocarditis
Billable codes
4
Subdivisions
4
CC / MCC codes
0 / 4
HCC V28 codes
0
New FY2027
0
Index entries
25

Codes in I40

  1. I40.0
    Infective myocarditis
    BillableMCC
    Inclusion terms 1, Use additional code 1

    Inclusion terms

    • Septic myocarditis

    Use additional code

    • code (B95-B97) to identify infectious agent B95 B97
  2. I40.1
    Isolated myocarditis
    BillableMCC
    Inclusion terms 3

    Inclusion terms

    • Fiedler's myocarditis
    • Giant cell myocarditis
    • Idiopathic myocarditis
  3. I40.8
    Other acute myocarditis
    BillableMCC
  4. I40.9
    Acute myocarditis, unspecified
    BillableMCC

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 I40

Includes

  • subacute myocarditis

Excludes1

  • acute rheumatic myocarditis (I01.2) I01.2

Notes that also apply

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

Index entries

  • Abramov-Fiedler myocarditis (acute isolated myocarditis) → I40.1
  • Abscess (connective tissue) (embolic) (fistulous) (infective) (metastatic) (multiple) (pernicious) (pyogenic) (septic)myocardium → I40.0
  • Infection, infected, infective (opportunistic)myocardium NEC → I40.0
  • Myocarditis (with arteriosclerosis)(chronic)(fibroid) (interstitial) (old) (progressive) (senile)bacterial (acute) → I40.0
  • Myocarditis (with arteriosclerosis)(chronic)(fibroid) (interstitial) (old) (progressive) (senile)infective → I40.0
  • Myocarditis (with arteriosclerosis)(chronic)(fibroid) (interstitial) (old) (progressive) (senile)pneumococcal → I40.0
  • Myocarditis (with arteriosclerosis)(chronic)(fibroid) (interstitial) (old) (progressive) (senile)septic → I40.0
  • Myocarditis (with arteriosclerosis)(chronic)(fibroid) (interstitial) (old) (progressive) (senile)staphylococcal → I40.0
  • Myocarditis (with arteriosclerosis)(chronic)(fibroid) (interstitial) (old) (progressive) (senile)suppurative → I40.0
  • Fiedler'smyocarditis (acute) → I40.1
  • Myocarditis (with arteriosclerosis)(chronic)(fibroid) (interstitial) (old) (progressive) (senile)eosinophilic → I40.1
  • Myocarditis (with arteriosclerosis)(chronic)(fibroid) (interstitial) (old) (progressive) (senile)Fiedler's (acute) (isolated) → I40.1
  • Myocarditis (with arteriosclerosis)(chronic)(fibroid) (interstitial) (old) (progressive) (senile)giant cell (acute) (subacute) → I40.1
  • Myocarditis (with arteriosclerosis)(chronic)(fibroid) (interstitial) (old) (progressive) (senile)granulomatous (idiopathic) (isolated) (nonspecific) → I40.1
  • Myocarditis (with arteriosclerosis)(chronic)(fibroid) (interstitial) (old) (progressive) (senile)idiopathic (granulomatous) → I40.1
  • Myocarditis (with arteriosclerosis)(chronic)(fibroid) (interstitial) (old) (progressive) (senile)isolated (acute) → I40.1
  • SyndromeFiedler's → I40.1
  • Myocarditis (with arteriosclerosis)(chronic)(fibroid) (interstitial) (old) (progressive) (senile)toxic → I40.8
  • Myocarditis (with arteriosclerosis)(chronic)(fibroid) (interstitial) (old) (progressive) (senile)active → I40.9
  • Myocarditis (with arteriosclerosis)(chronic)(fibroid) (interstitial) (old) (progressive) (senile)acute or subacute (interstitial) → I40.9
  • Myocarditis (with arteriosclerosis)(chronic)(fibroid) (interstitial) (old) (progressive) (senile)nonrheumatic, active → I40.9
  • Myocarditis (with arteriosclerosis)(chronic)(fibroid) (interstitial) (old) (progressive) (senile)parenchymatous → I40.9
  • Myocarditis (with arteriosclerosis)(chronic)(fibroid) (interstitial) (old) (progressive) (senile)acute or subacute (interstitial)idiopathic → I40.1
  • Myocarditis (with arteriosclerosis)(chronic)(fibroid) (interstitial) (old) (progressive) (senile)acute or subacute (interstitial)specified NEC → I40.8
  • Rupture, rupturedcardiac (auricle) (ventricle) (wall)infectional → I40.9

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

Hierarchy