Excludes1 pair
I01.0 vs I30-
I01.0 and I30 are not coded together. ICD-10-CM declares them mutually exclusive with an Excludes1 note — the two conditions are not expected to occur together, so exactly one of them is normally correct for a given encounter. The Official Guidelines carve out one exception: if the two conditions are clearly unrelated to each other, both may be reported.
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 (active) (acute) (with effusion) (with pneumonia)
- Rheumatic › pericarditis (active) (acute) (with effusion) (with pneumonia)
- Pericarditis › acute › rheumatic
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