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Compare/B43 vs C84.0

B43 vs C84.0

B43 (Chromomycosis and pheomycotic abscess) compared with C84.0 (Mycosis fungoides), from the official CMS tabular data. Both may be reported when both conditions are documented (Excludes2).

Can these codes be reported together?

Yes, when both are documented. B43 carries an Excludes2 note covering C84.0: “mycosis fungoides (C84.0-)”

Excludes2 marks distinct conditions — both may be reported when both are documented.

Side by side

B43Chromomycosis and pheomycotic abscessC84.0Mycosis fungoides
Billing statusNon-billable header

Report instead: B43.0, B43.1, B43.2, B43.8, B43.9

Non-billable header

Report instead: C84.00, C84.01, C84.02, C84.03, C84.04

ClassificationA00-B99 — Certain Infectious and Parasitic Diseases (A00-B99)C00-D49 — Neoplasms (C00-D49)
DefinitionChromomycosis and pheomycotic abscess is a non-billable ICD-10-CM category code (B43).Mycosis fungoides is a non-billable ICD-10-CM category code (C84.0).
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Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources