I09.2 vs I31
I09.2 and I31 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 I09.2
chronic pericarditis not specified as rheumatic (I31.-)
I09.2
Chronic rheumatic pericarditis
Billable
- Chapter 9
- Diseases of the circulatory system
- Section
- I05-I09
Use when the record says
- Adherent pericardium, rheumatic
- Chronic rheumatic mediastinopericarditis
- Chronic rheumatic myopericarditis
Indexed under
- Concretio cordis › rheumatic
- Myopericarditis › chronic rheumatic
- Rheumatic › adherent pericardium (acute) (subacute)
- Adherent › pericardium › rheumatic
- Adhesions, adhesive › cardiac › rheumatic (postinfective)
I31
Other diseases of pericardium
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