I51.4

Myocarditis, unspecified

Risk-adjusting (HCC)Billable code

HCC risk adjustment mapping

CMS-HCC V28

HCC227

Cardiomyopathy/Myocarditis

CMS-HCC ESRD V24

HCC85

Congestive Heart Failure

RxHCC V08

RXHCC186

Heart Failure

Coding notes

Excludes 1 never coded together · Excludes 2 may co-exist

This code · I51.4

Excludes 1

acute or subacute myocarditis (I40.-)

Synonyms

Chronic (interstitial) myocarditis Myocardial fibrosis Myocarditis NOS

Inherited from I51Complications and ill-defined descriptions of heart disease

Excludes 2

heart disease specified as rheumatic (I00-I09)

Inherited from chapter 9Diseases of the circulatory system

Excludes 2

certain conditions originating in the perinatal period (P04-P96) certain infectious and parasitic diseases (A00-B99) complications of pregnancy, childbirth and the puerperium (O00-O9A) congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99) endocrine, nutritional and metabolic diseases (E00-E88) injury, poisoning and certain other consequences of external causes (S00-T88) neoplasms (C00-D49) symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94) systemic connective tissue disorders (M30-M36) transient cerebral ischemic attacks and related syndromes (G45.-)

Official Guidelines for I51.4

FY 2026 ›

I.C.9Chapter-specific guidanceChapter 9: Diseases of the Circulatory System (I00-I99)

Subsections

Sections that reference I51.4

I.C.9.a.1)Hypertension with Heart Disease
Hypertension with heart conditions classified to I50.-, Heart failure, I51.4, Myocarditis, unspecified, I51.89, Other ill-defined heart diseases, and I51.9, Heart disease, unspecified, is assigned to a …

Sections whose FY 2026 text names I51.4, its I51 category, or a range containing it — the chapter guidance above is the authoritative source.

Find I51.4 in the alphabetic index

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