Excludes1 pair
B81.1 vs B83-
B81.1 and B83 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 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 (intestinal)
- Diarrhea, diarrheal › due to › Capillaria philippinensis
- Infection, infected, infective › Capillaria › philippinensis
- 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