ICD-10 Code B42 – Sporotrichosis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code B42 – Sporotrichosis
What it is
Sporotrichosis is a fungal infection caused by Sporothrix species. It usually begins after the organism enters the skin through a cut or puncture wound.
Clinical signs
Typical findings include a small skin nodule or ulcer at the entry site, sometimes followed by nodules spreading along lymphatic channels. Clinical features vary; refer to documentation.
When to use this code
Use B42 when the provider documents sporotrichosis as the confirmed diagnosis. It applies whether the infection is limited to skin or has spread in a documented pattern. If the note only says suspected fungal infection, check documentation before coding.
Do not use for
Do not use this code for other fungal skin infections or for nonspecific dermatitis. If the record does not identify sporotrichosis, choose the documented condition instead.
Coding tip
Code the organism-specific diagnosis only when the chart clearly names sporotrichosis; otherwise, query or check documentation.