ICD-10-CM 2027
ICD-10 code for myocarditis rheumatic
From the official ICD-10-CM alphabetic index entry “Rheumatic (acute) (subacute) › myocarditis (chronic) (inactive) (with chorea)”. Page updated September 29, 2026.
About coding myocarditis rheumatic
The ICD-10-CM code for myocarditis rheumatic is I09.0 (Rheumatic myocarditis). The official index lists 2 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on I09.0.
Within I09 (other rheumatic heart diseases), I09.0 is specifically for rheumatic myocarditis. Related codes cover rheumatic diseases of endocardium, valve unspecified (I09.1), chronic rheumatic pericarditis (I09.2), other specified rheumatic heart diseases (I09.8) and rheumatic heart disease, unspecified (I09.9).
Don't report I09.0 together with the conditions in its Excludes1 note: myocarditis not specified as rheumatic (I51.4).
As a secondary diagnosis it is a CC (complication or comorbidity), which can move an inpatient stay into the "with CC" MS-DRG of its family, unless the principal diagnosis excludes it.
More specific myocarditis rheumatic codes (official index)
Don't confuse with (Excludes1 for I09.0)
- myocarditis not specified as rheumatic (I51.4)
Common questions about myocarditis rheumatic ICD-10 codes
What is the ICD-10 code for myocarditis rheumatic?
- I09.0 — Rheumatic myocarditis. More specific codes apply when the documentation supports them: I01.2, I02.0.
What is the ICD-10 code for active or acute myocarditis rheumatic?
- I01.2 — Acute rheumatic myocarditis.
Is I09.0 billable?
- Yes. I09.0 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can I09.0 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict I09.0 as a principal diagnosis.
Is I09.0 a CC or MCC?
- I09.0 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.