Excludes1 pair
A42- vs B47.1
A42 and B47.1 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 A42
actinomycetoma (B47.1)
B47.1
Actinomycetoma
Billable
- Chapter 1
- Certain infectious and parasitic diseases
- Section
- B35-B49
Indexed under
- Actinomycetoma (foot)
- Streptomycosis
- Infection, infected, infective › Actinomadura
- Infection, infected, infective › Streptomyces
- Mycetoma › actinomycotic
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