I09.9 Rheumatic heart disease, unspecified

Billable ICD-10-CM code, FY2026.

Applicable to

• Rheumatic carditis

Excludes1 (never code together)

• rheumatoid carditis (M05.31)

MS-DRG index

Defines the logic of DRG(s) 314-316 in MDC 05.

Approximate ICD-9-CM (GEMs)

• 398.90 Rheumatic heart disease, unspecified

Code annotations containing back-references to I09.9

Back-references to I09

• Type 1 Excludes: I01 Rheumatic fever with heart involvement ("chronic diseases of rheumatic origin (I05-I09) unless rheumatic fever is also present or there is evidence of reactivation or activity of the rheumatic process.")
• Type 2 Excludes: I51 Complications and ill-defined descriptions of heart disease ("heart disease specified as rheumatic (I00-I09)")

Diagnosis Index entries for I09.9

• Disease, diseased › heart (organic) › with › rheumatic fever (conditions in I00) › inactive or quiescent (with chorea)
• Disease, diseased › heart (organic) › rheumatic (chronic) (inactive) (old) (quiescent) (with chorea)
• Failure, failed › heart (acute) (senile) (sudden) › rheumatic (chronic) (inactive)
• Fever (inanition) (of unknown origin) (persistent) (with chills) (with rigor) › rheumatic (active) (acute) (chronic) (subacute) › inactive or quiescent with › carditis
• Fever (inanition) (of unknown origin) (persistent) (with chills) (with rigor) › rheumatic (active) (acute) (chronic) (subacute) › inactive or quiescent with › pancarditis

Nearby codes

• I09.1 Rheumatic diseases of endocardium, valve unspecified
• I09.2 Chronic rheumatic pericarditis
• I09.8 Other specified rheumatic heart diseases
• I09.81 Rheumatic heart failure
• I09.89 Other specified rheumatic heart diseases
• I09.9 Rheumatic heart disease, unspecified (this code)