ICD-10 Code B43.0 – Cutaneous chromomycosis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code B43.0 – Cutaneous chromomycosis
What it is
Cutaneous chromomycosis is a chronic fungal infection of the skin caused by pigmented fungi. It usually develops after traumatic inoculation and can slowly enlarge over time.
Clinical signs
Typical findings include wart-like, plaque-like, or nodular skin lesions, often on exposed areas such as the feet or legs. Clinical features vary; refer to documentation.
When to use this code
Use B43.0 when the provider documents cutaneous chromomycosis or chromoblastomycosis limited to the skin. Code it for confirmed chronic fungal skin infection with compatible clinical description and documentation. If the record only says “fungal lesion” or is unclear, check documentation before assigning this code.
Do not use for
Do not use this code for other fungal skin infections without documentation of chromomycosis. Do not assign it when the site is deeper than the skin or when the diagnosis is uncertain.
Coding tip
Code from the provider’s documented diagnosis, and confirm the lesion is cutaneous rather than another fungal condition.