Excludes1 pair
I30.9 vs I31.3-
I30.9 and I31.3 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 I31.3
acute pericardial effusion (I30.9)
I30.9
Acute pericarditis, unspecified
BillableUnspecified
- Chapter 9
- Diseases of the circulatory system
- Section
- I30-I5A
Indexed under
- Chylopericardium › acute
- Mediastinopericarditis › acute
- Pericarditis › acute (hemorrhagic) (nonrheumatic) (Sicca)
- Pleuropericarditis › acute
- Pneumopericarditis › acute
I31.3
Pericardial effusion (noninflammatory)
Not billable
- Chapter 9
- Diseases of the circulatory system
- Section
- I30-I5A
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