I51.4 – Myocarditis, unspecified

ICD-10-CM 2027 diagnosis code · Other forms of heart disease

Billable code

ICD-10-CM code I51.4

Code: I51.4 (claims format: I514)
Description: Myocarditis, unspecified
Billable: Yes – valid for HIPAA-covered transactions
Valid for: Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter: 9. Diseases of the circulatory system (I00-I99)
Block: I30-I5A Other forms of heart disease
Parent codes: I51

Notes for I51.4

Applicable to:

Chronic (interstitial) myocarditis
Myocardial fibrosis
Myocarditis NOS

Excludes1 (not coded here):

acute or subacute myocarditis (I40.-)

Notes inherited from parent codes

Instructional notes at a category or block level apply to every code below it.

I51 – Complications and ill-defined descriptions of heart disease

Excludes2 (not included here):

heart disease specified as rheumatic (I00-I09)

Index terms for I51.4

Entries in the ICD-10-CM alphabetic index that lead to this code:

Related codes in I51

I51.0 – Cardiac septal defect, acquiredBillable
I51.1 – Rupture of chordae tendineae, not elsewhere classifiedBillable
I51.2 – Rupture of papillary muscle, not elsewhere classifiedBillable
I51.3 – Intracardiac thrombosis, not elsewhere classifiedBillable
I51.5 – Myocardial degenerationBillable
I51.7 – CardiomegalyBillable
I51.8 – Other ill-defined heart diseasesHeader
I51.9 – Heart disease, unspecifiedBillable

Frequently asked questions

What is ICD-10 code I51.4?

I51.4 is the ICD-10-CM code for myocarditis, unspecified, in the block I30-I5A (Other forms of heart disease).

Is I51.4 a billable code?

Yes. I51.4 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.

What category does I51.4 belong to?

It belongs to category I51 – Complications and ill-defined descriptions of heart disease.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.