I01.2 Acute rheumatic myocarditis

Billable ICD-10-CM code, FY2026. Acts as a Complication or Comorbidity (CC) as a secondary diagnosis.

Applicable to

• Any condition in I00 with myocarditis

Applies from I01 Rheumatic fever with heart involvement

Excludes1 (never code together)

• 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.

MS-DRG index

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

Approximate ICD-9-CM (GEMs)

• 391.2 Acute rheumatic myocarditis

Code annotations containing back-references to I01.2

Back-references to I01.2

• Type 1 Excludes: I00 Rheumatic fever without heart involvement ("rheumatic fever with heart involvement (I01.0 -I01.9)")
• Type 1 Excludes: I40 Acute myocarditis ("acute rheumatic myocarditis (I01.2)")

Back-references to I01

• Type 2 Excludes: I51 Complications and ill-defined descriptions of heart disease ("heart disease specified as rheumatic (I00-I09)")

Diagnosis Index entries for I01.2

• Degeneration, degenerative › myocardial, myocardium (fatty) (hyaline) (senile) › with rheumatic fever (conditions in I00) › active, acute or subacute
• Insufficiency, insufficient › myocardial, myocardium (with arteriosclerosis) › with › rheumatic fever (conditions in I00) › active, acute or subacute
• Insufficiency, insufficient › myocardial, myocardium (with arteriosclerosis) › rheumatic › active, acute, or subacute
• Myocarditis (with arteriosclerosis)(chronic)(fibroid) (interstitial) (old) (progressive) (senile) › active › rheumatic
• Myocarditis (with arteriosclerosis)(chronic)(fibroid) (interstitial) (old) (progressive) (senile) › acute or subacute (interstitial) › due to › streptococcus (beta-hemolytic)
• Myocarditis (with arteriosclerosis)(chronic)(fibroid) (interstitial) (old) (progressive) (senile) › acute or subacute (interstitial) › rheumatic
• Myocarditis (with arteriosclerosis)(chronic)(fibroid) (interstitial) (old) (progressive) (senile) › rheumatic (chronic) (inactive) (with chorea) › active or acute
• Rheumatic (acute) (subacute) › myocarditis (chronic) (inactive) (with chorea) › active or acute

Nearby codes

• I01 Rheumatic fever with heart involvement
• I01.0 Acute rheumatic pericarditis
• I01.1 Acute rheumatic endocarditis
• I01.2 Acute rheumatic myocarditis (this code)
• I01.8 Other acute rheumatic heart disease
• I01.9 Acute rheumatic heart disease, unspecified