ICD-10-CM Alphabetic Index · FY 2026 59 Entries
Myocarditis in the ICD-10-CM Index ICD-10-CM
The main term Myocarditis (with arteriosclerosis) (chronic) (fibroid) (interstitial) (old) (progressive) (senile) carries 59 index entries pointing to 22 ICD-10-CM codes. The default entry is I51.4, the code the bare main term maps to; every indented line below refines the term by site, cause, or type. Verify any candidate code in the Tabular List before using it.
✓ Built from the official CMS FY 2026 index fileEffective Oct 1, 2025 – Sep 30, 2026
59
Index Entries
22
Codes Referenced
I51.4
Default Code
M
Letter
59 of 59 shown
ICD-10-CM
Index Entries Under Myocarditis 59 entries · 22 codes
Myocarditis (with arteriosclerosis) (chronic) (fibroid) (interstitial) (old) (progressive) (senile) I51.4
with
rheumatic fever (conditions in I00) I09.0
active see Myocarditis, acute, rheumatic
inactive or quiescent (with chorea) I09.0
active I40.9
rheumatic I01.2
with chorea (acute) (rheumatic) (Sydenham's) I02.0
acute or subacute (interstitial) I40.9
due to
streptococcus (beta-hemolytic) I01.2
idiopathic I40.1
rheumatic I01.2
with chorea (acute) (rheumatic) (Sydenham's) I02.0
specified NEC I40.8
aseptic of newborn B33.22
bacterial (acute) I40.0
Coxsackie (virus) B33.22
diphtheritic A36.81
eosinophilic I40.1
epidemic of newborn (Coxsackie) B33.22
Fiedler's (acute) (isolated) I40.1
giant cell (acute) (subacute) I40.1
gonococcal A54.83
granulomatous (idiopathic) (isolated) (nonspecific) I40.1
hypertensive see Hypertension, heart
idiopathic (granulomatous) I40.1
in (due to)
diphtheria A36.81
epidemic louse-borne typhus A75.0
Lyme disease A69.29
sarcoidosis D86.85
scarlet fever A38.1
toxoplasmosis (acquired) B58.81
typhoid A01.02
typhus NEC A75.9
infective I40.0
influenzal see Influenza, with, myocarditis
isolated (acute) I40.1
meningococcal A39.52
mumps B26.82
nonrheumatic, active I40.9
parenchymatous I40.9
pneumococcal I40.0
rheumatic (chronic) (inactive) (with chorea) I09.0
active or acute I01.2
with chorea (acute) (rheumatic) (Sydenham's) I02.0
rheumatoid see Rheumatoid, carditis
septic I40.0
staphylococcal I40.0
suppurative I40.0
syphilitic (chronic) A52.06
toxic I40.8
rheumatic see Myocarditis, acute, rheumatic
tuberculous A18.84
typhoid A01.02
valvular see Endocarditis
virus, viral B33.22
of newborn (Coxsackie) B33.22
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Related Index Terms
Source: Centers for Medicare & Medicaid Services, FY 2026 ICD-10-CM Index to Diseases and Injuries release files, effective October 1, 2025 through September 30, 2026.
