B35 vs C84.0

B35 (Dermatophytosis) 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. B35 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

	B35Dermatophytosis	C84.0Mycosis fungoides
Billing status	Non-billable header Report instead: B35.0, B35.1, B35.2, B35.3, B35.4	Non-billable header Report instead: C84.00, C84.01, C84.02, C84.03, C84.04
Classification	A00-B99 — Certain Infectious and Parasitic Diseases (A00-B99)	C00-D49 — Neoplasms (C00-D49)
Definition	Dermatophytosis is a non-billable ICD-10-CM category code (B35).	Mycosis fungoides is a non-billable ICD-10-CM category code (C84.0).
Includes	favus infections due to species of Epidermophyton, Micro-sporum and Trichophyton tinea, any type except those in B36.-	—

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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