B40 vs B48.0
B40 and B48.0 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 B40
keloidal blastomycosis (B48.0)
B48.0
Lobomycosis
Billable
- Chapter 1
- Certain infectious and parasitic diseases
- Section
- B35-B49
Use when the record says
- Keloidal blastomycosis
- Lobo's disease
Indexed under
- Lobomycosis
- Lobo's disease
- Blastomycosis, blastomycotic › keloidal
- Disease, diseased › Lobo's
- Infection, infected, infective › glenosporopsis (opportunistic)
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