Myocarditis in diseases classified elsewhere (I41)
The ICD-10 code I41 is used to classify myocarditis occurring as part of other diseases, rather than as a standalone condition. This code covers inflammation of the heart muscle linked to a variety of underlying disorders.
This code applies to myocarditis due to infections, autoimmune diseases, and other systemic conditions. Common synonyms that help clarify its use include myocarditis due to COVID-19, Chagas' disease with heart involvement, hypersensitivity myocarditis, Kawasaki disease myocarditis, and myocarditis related to HIV/AIDS or idiopathic hypereosinophilic syndrome. Medical coders reference I41 when documenting myocardial inflammation that is explicitly caused by or associated with these primary diseases, ensuring accurate classification and proper clinical context. For anyone searching for the ICD-10 code for myocarditis caused by another disorder, I41 captures the array of myocarditis types linked to systemic or infectious origins, rather than isolated cardiac inflammation.
Diseases of the circulatory system (I00–I99)
Other forms of heart disease (I30-I5A)
- I41 Myocarditis in diseases classified elsewhere
Myocarditis in diseases classified elsewhere (I41)
Instructional Notations
Code First
Certain conditions have both an underlying etiology and multiple body system manifestations due to the underlying etiology. For such conditions, the ICD-10-CM has a coding convention that requires the underlying condition be sequenced first followed by the manifestation. Wherever such a combination exists, there is a "use additional code" note at the etiology code, and a "code first" note at the manifestation code. These instructional notes indicate the proper sequencing order of the codes, etiology followed by manifestation.
Type 1 Excludes
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
