ICD-10 Code B35.4 – Tinea corporis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code B35.4 – Tinea corporis
What it is
Tinea corporis is a superficial fungal infection of the body skin, often called ringworm. It usually affects smooth skin on the trunk, limbs, or face.
Clinical signs
Typical findings include annular, scaly plaques with a raised border and central clearing. Clinical features vary; refer to documentation if the appearance is atypical or the site is unclear.
When to use this code
Use B35.4 when the record documents tinea corporis, ringworm of the body, or a dermatophyte infection on non-hairy skin of the trunk or extremities. Code it when the provider identifies the condition clinically or by testing. If the note only says “fungal rash,” check documentation.
Do not use for
Do not use this code for tinea capitis, tinea pedis, tinea cruris, or nail involvement. If the infection site is different or not specified, choose the documented diagnosis or check documentation.
Coding tip
Match the code to the exact anatomic site and documented fungal diagnosis before assigning B35.4.