B35.1 Tinea unguium

Billable ICD-10-CM code, FY2026.

Applicable to

• Dermatophytic onychia
• Dermatophytosis of nail
• Onychomycosis
• Ringworm of nails

Applies from B35 Dermatophytosis

Includes

• favus
• infections due to species of Epidermophyton, Micro-sporum and Trichophyton
• tinea, any type except those in B36.-

MS-DRG index

Defines the logic of DRG(s) 606-607 in MDC 09.

Approximate ICD-9-CM (GEMs)

• 110.1 Dermatophytosis of nail

Code annotations containing back-references to B35.1

Back-references to B35

• Code First: M01 Direct infections of joint in infectious and parasitic diseases classified elsewhere ("mycoses (B35-B49)")

Diagnosis Index entries for B35.1

• Dermatophytosis (epidermophyton) (infection) (Microsporum) (tinea) (Trichophyton) › nail
• Infection, infected, infective (opportunistic) › finger (skin) › nail › fungus
• Infection, infected, infective (opportunistic) › fungus NOS › nail
• Infection, infected, infective (opportunistic) › fungus NOS › skin › toenails
• Infection, infected, infective (opportunistic) › nail (chronic) › finger › fungus
• Infection, infected, infective (opportunistic) › nail (chronic) › toe › fungus
• Infection, infected, infective (opportunistic) › toe (skin) › cellulitis › fungus
• Infection, infected, infective (opportunistic) › toe (skin) › nail › fungus
• Mycosis, mycotic › nails
• Onychia › dermatophytic
• Onychomycosis (finger) (toe)
• Ringworm › nails
• Tinea (intersecta) (tarsi) › unguium

Nearby codes

• B35 Dermatophytosis
• B35.0 Tinea barbae and tinea capitis
• B35.1 Tinea unguium (this code)
• B35.2 Tinea manuum
• B35.3 Tinea pedis
• B35.4 Tinea corporis
• B35.5 Tinea imbricata
• B35.6 Tinea cruris