B81.1 vs B83
B81.1 and B83 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 B83
capillariasis NOS (B81.1)
B81.1
Intestinal capillariasis
Billable
- Chapter 1
- Certain infectious and parasitic diseases
- Section
- B65-B83
Use when the record says
- Capillariasis NOS
- Infection due to Capillaria philippinensis
Indexed under
- Capillariasis (intestinal)
- Infection, infected, infective › Capillaria (opportunistic)
- Diarrhea, diarrheal › due to › Capillaria philippinensis (disease) (infantile) (inflammatory)
- Infection, infected, infective › Capillaria › philippinensis (opportunistic)
- Infestation › Capillaria › philippinensis
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