I01.0 vs I30
I01.0 and I30 can never be reported together. ICD-10-CM declares them mutually exclusive with an Excludes1 note, meaning the two conditions cannot occur in the same patient — so exactly one of them is correct for any given encounter.
The official note, declared on I01.0
acute pericarditis not specified as rheumatic (I30.-)
I01.0
Acute rheumatic pericarditis
Billable
- Chapter 9
- Diseases of the circulatory system
- Section
- I00-I02
Use when the record says
- Any condition in I00 with pericarditis
- Rheumatic pericarditis (acute)
Indexed under
- Pericarditis › rheumatic (with decompensation) (with effusion)
- Rheumatic › pericarditis (acute) (subacute)
- Pericarditis › acute › rheumatic (with decompensation) (with effusion)
I30
Acute pericarditis
Not billable
- Chapter 9
- Diseases of the circulatory system
- Section
- I30-I5A
Use when the record says
- acute mediastinopericarditis
- acute myopericarditis
- acute pericardial effusion
- acute pleuropericarditis
- acute pneumopericarditis
Excludes1 is not always absolute: where two conditions covered by the note are genuinely unrelated, CMS guidance permits reporting both. Document the reasoning rather than assuming it. More on Excludes1 vs Excludes2 · FY2027