ICD-10 Code B47 – Mycetoma (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code B47 – Mycetoma
What it is
B47 identifies mycetoma, a chronic, progressive infection that usually affects the skin and deeper tissues, often in the foot. It is typically caused by fungi or bacteria that enter through minor trauma.
Clinical signs
Common findings include a swollen mass, draining sinuses, and discharge that may contain grains. Clinical features vary; refer to documentation for the organism and affected site.
When to use this code
Use B47 when the provider documents mycetoma or maduromycosis. Code it for confirmed infection of the soft tissues, especially when the record describes chronic swelling with sinus tracts or grain-like material.
Check documentation if the note only mentions a suspected fungal infection, abscess, or other localized skin lesion without mycetoma.
Do not use for
Do not use B47 for uncomplicated cellulitis, abscess, or superficial wound infection. If the diagnosis is not clearly mycetoma, check documentation.
Coding tip
Confirm the provider’s exact diagnosis and site, and code any documented organism or laterality separately when supported.