ICD-10 Code B35.3 – Tinea pedis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code B35.3 – Tinea pedis
What it is
Tinea pedis is a fungal infection of the feet, commonly called athlete’s foot. It usually affects the skin between the toes or the soles and is caused by dermatophytes.
Clinical signs
Typical findings include itching, scaling, redness, cracking, or peeling skin on the feet. Clinical features vary; refer to documentation if the presentation is atypical.
When to use this code
Use B35.3 when the record clearly documents tinea pedis or athlete’s foot as the diagnosis. It is appropriate for outpatient or inpatient encounters when the provider identifies a fungal infection of the foot. If the note only describes nonspecific rash or dermatitis, check documentation before assigning this code.
Do not use for
Do not use this code for bacterial foot infections, eczema, or nonspecific skin irritation. If the diagnosis is not explicitly fungal, check documentation.
Coding tip
Look for provider wording such as “tinea pedis” or “athlete’s foot” and code from the documented site, not the symptom alone.