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B35.1 — Tinea unguium
B35.1
What this code means
A fungal infection of the nails, usually toenails, making them thickened, discoloured and crumbly.
Also called: tinea unguium, onychomycosis, fungal nail infection.
When this code is used
Used for fungal infection of the nails.
Where it sits in ICD-10-CM
Code B35.1 belongs to Chapter 1: Infectious and parasitic diseases, which covers codes A00–B99 in the FY2027 ICD-10-CM tabular list. The official description above is copied verbatim from the CDC/NCHS FY2027 code file.
Related symptoms
Frequently asked questions
What is ICD-10-CM code B35.1?
B35.1 is the ICD-10-CM diagnosis code for “Tinea unguium”. A fungal infection of the nails, usually toenails, making them thickened, discoloured and crumbly.
When is code B35.1 used?
Used for fungal infection of the nails. It belongs to Chapter 1 of ICD-10-CM (Infectious and parasitic diseases).
This guide explains ICD-10-CM codes in plain language for patients, students and other readers. It is educational information only — not coding, billing or medical advice. The code recorded for any real encounter is assigned from the full clinical documentation by the treating team and qualified coders, and only they can decide which code fits a specific case.