ICD-10 Code for Myocarditis
Also indexed as (with arteriosclerosis)(chronic)(fibroid) (interstitial) (old) (progressive) (senile)
The ICD-10-CM code for myocarditis is I51.4 — Myocarditis, unspecified. This is the code the Alphabetic Index gives for myocarditis with no further qualifier, valid for FY2027 (October 1, 2026 – September 30, 2027).
I51.4 is billable but unspecified. If the documentation names a type, site or cause, one of the more specific codes below is likely expected.
Which myocarditis code should you use?
The Alphabetic Index lists 23 codes under Myocarditis. Which one applies depends on the qualifier documented in the record — the type, site, cause, or associated condition. Find the qualifier below, then verify the code in the Tabular List before using it.
By type
| active | I40.9 | Acute myocarditis, unspecified | |
| acute or subacute | I40.9 | Acute myocarditis, unspecified | |
| aseptic of newborn | B33.22 | Viral myocarditis | |
| bacterial | I40.0 | Infective myocarditis | |
| Coxsackie | B33.22 | Viral myocarditis | |
| diphtheritic | A36.81 | Diphtheritic cardiomyopathy | |
| eosinophilic | I40.1 | Isolated myocarditis | |
| epidemic of newborn | B33.22 | Viral myocarditis | |
| Fiedler's | I40.1 | Isolated myocarditis | |
| giant cell | I40.1 | Isolated myocarditis | |
| gonococcal | A54.83 | Gonococcal heart infection | |
| granulomatous | I40.1 | Isolated myocarditis | |
| idiopathic | I40.1 | Isolated myocarditis | |
| infective | I40.0 | Infective myocarditis | |
| isolated | I40.1 | Isolated myocarditis | |
| meningococcal | A39.52 | Meningococcal myocarditis | |
| mumps | B26.82 | Mumps myocarditis | |
| nonrheumatic, active | I40.9 | Acute myocarditis, unspecified | |
| parenchymatous | I40.9 | Acute myocarditis, unspecified | |
| pneumococcal | I40.0 | Infective myocarditis | |
| rheumatic | I09.0 | Rheumatic myocarditis | |
| septic | I40.0 | Infective myocarditis | |
| staphylococcal | I40.0 | Infective myocarditis | |
| suppurative | I40.0 | Infective myocarditis | |
| syphilitic | A52.06 | Other syphilitic heart involvement | |
| toxic | I40.8 | Other acute myocarditis | |
| tuberculous | A18.84 | Tuberculosis of heart | |
| typhoid | A01.02 | Typhoid fever with heart involvement | |
| virus, viral | B33.22 | Viral myocarditis |
Myocarditis with
Myocarditis active
Myocarditis acute or subacute
Myocarditis in
| diphtheria | A36.81 | Diphtheritic cardiomyopathy | |
| epidemic louse-borne typhus | A75.0 | Epidemic louse-borne typhus fever due to Rickettsia prowazekii | |
| Lyme disease | A69.29 | Other conditions associated with Lyme disease | |
| sarcoidosis | D86.85 | Sarcoid myocarditis | |
| scarlet fever | A38.1 | Scarlet fever with myocarditis | |
| toxoplasmosis | B58.81 | Toxoplasma myocarditis | |
| typhoid | A01.02 | Typhoid fever with heart involvement | |
| typhus NEC | A75.9 | Typhus fever, unspecified |
Myocarditis rheumatic
Myocarditis virus, viral
| of newborn | B33.22 | Viral myocarditis |
Index terms and codes are reproduced from the official ICD-10-CM FY2027 release. The Alphabetic Index is a finding aid — a code must always be verified in the Tabular List before it is reported. Data sources