ICD-10-CM
ICD-10 code for Myocarditis: I51.4
The ICD-10-CM index points "Myocarditis" to I51.4, Myocarditis, unspecified. I51.4 is a billable code.
Source: CDC ICD-10-CM FY2027 Alphabetic Index file dated June 16, 2026. Publisher page
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Index subterms
A header groups codes and is not billed. A billable code is one you can report.
- I40.9active, Acute myocarditis, unspecifiedBillable
- I40.9acute or subacute (interstitial), Acute myocarditis, unspecifiedBillable
- B33.22aseptic of newborn, Viral myocarditisBillable
- I40.0bacterial (acute), Infective myocarditisBillable
- B33.22Coxsackie (virus), Viral myocarditisBillable
- A36.81diphtheritic, Diphtheritic cardiomyopathyBillable
- I40.1eosinophilic, Isolated myocarditisBillable
- B33.22epidemic of newborn (Coxsackie), Viral myocarditisBillable
- I40.1Fiedler's (acute) (isolated), Isolated myocarditisBillable
- I40.1giant cell (acute) (subacute), Isolated myocarditisBillable
- A54.83gonococcal, Gonococcal heart infectionBillable
- I40.1granulomatous (idiopathic) (isolated) (nonspecific), Isolated myocarditisBillable
- I40.1idiopathic (granulomatous), Isolated myocarditisBillable
- I40.0infective, Infective myocarditisBillable
- I40.1isolated (acute), Isolated myocarditisBillable
- A39.52meningococcal, Meningococcal myocarditisBillable
- B26.82mumps, Mumps myocarditisBillable
- I40.9nonrheumatic, active, Acute myocarditis, unspecifiedBillable
- I40.9parenchymatous, Acute myocarditis, unspecifiedBillable
- I40.0pneumococcal, Infective myocarditisBillable
- I09.0rheumatic (chronic) (inactive) (with chorea), Rheumatic myocarditisBillable
- I40.0septic, Infective myocarditisBillable
- I40.0staphylococcal, Infective myocarditisBillable
- I40.0suppurative, Infective myocarditisBillable
- A52.06syphilitic (chronic), Other syphilitic heart involvementBillable
- I40.8toxic, Other acute myocarditisBillable
- A18.84tuberculous, Tuberculosis of heartBillable
- A01.02typhoid, Typhoid fever with heart involvementBillable
- B33.22virus, viral, Viral myocarditisBillable
More specific codes in I51
A header groups codes and is not billed. A billable code is one you can report.
- I51Complications and ill-defined descriptions of heart diseaseHeader
- I51.0Cardiac septal defect, acquiredBillable
- I51.1Rupture of chordae tendineae, not elsewhere classifiedBillable
- I51.2Rupture of papillary muscle, not elsewhere classifiedBillable
- I51.3Intracardiac thrombosis, not elsewhere classifiedBillable
- I51.4Myocarditis, unspecifiedBillable
- I51.5Myocardial degenerationBillable
- I51.7CardiomegalyBillable
- I51.8Other ill-defined heart diseasesHeader
- I51.81Takotsubo syndromeBillable
- I51.89Other ill-defined heart diseasesBillable
- I51.9Heart disease, unspecifiedBillable
Excludes1
Excludes1 means these codes are not reported together.
Excludes2
Excludes2 means the other condition can be reported with this one when both are documented.
From I51. A note on a category applies to every code under it.
Related conditions
Related pages
- I51.4 code detailsNotes, nearby codes, CMS-HCC group
- Category I51Every code under it
- Chapter 9Diseases of the circulatory system
- ICD-10 codes by conditionA to Z
- Check a list of ICD-10 codes
- Denial code CO-11Diagnosis does not support the procedure
- Denial code CO-146Diagnosis invalid for the date of service
- HCPCS Level II code lookup
Questions
What is the ICD-10 code for Myocarditis?
The ICD-10-CM index points "Myocarditis" to I51.4, Myocarditis, unspecified. I51.4 is a billable code.
Is I51.4 billable?
Yes. I51.4 is a billable code in the FY2027 ICD-10-CM file. Use a more specific code when the record documents one.
What documentation notes apply to I51.4?
The CDC tabular list gives 1 Excludes1 note (not coded together), 1 Excludes2 note (may be coded together when both are documented) for I51.4 and the categories above it. They are listed on this page.
What chapter is I51.4 in?
Chapter 9. Diseases of the circulatory system.
When do ICD-10-CM codes change?
Every October 1, with the new fiscal year file. Some years add April 1 updates. This page uses the FY2027 file, effective October 1, 2026.