ICD-10-CM · Chapter 9

I51..4 Myocarditis, unspecified

Billable

← I51 — Complications and ill-defined descriptions of heart disease Chapter 9: I00-I99

Includes

Chronic (interstitial) myocarditis
Myocardial fibrosis
Myocarditis NOS

Excludes 1 (cannot be coded together)

acute or subacute myocarditis (I40.-)

Last reviewed: September 2026