Excludes1 pair
B78- vs B81.2
B78 and B81.2 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 B78
trichostrongyliasis (B81.2)
B81.2
Trichostrongyliasis
Billable
- Chapter 1
- Certain infectious and parasitic diseases
- Section
- B65-B83
Indexed under
- Trichostrongyliasis, trichostrongylosis (small intestine)
- Trichostrongylus infection
- Infection, infected, infective › Trichostrongylus
- Infestation › Trichostrongylus
- Infestation › nematode NEC › trichostrongylus
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