ICD-10 Code B47.9 – Mycetoma, unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code B47.9 – Mycetoma, unspecified
What it is
B47.9 identifies mycetoma when the organism or type is not specified. It is a chronic, localized infection that usually affects skin and deeper tissues, often after minor trauma.
Clinical signs
Typical findings include a slowly enlarging swelling, draining sinuses, and discharge that may contain grains. Clinical features vary; refer to documentation.
When to use this code
Use B47.9 when the record documents mycetoma but does not name the causative fungus or bacterium. Apply it when the provider notes the condition as unspecified, or when available documentation is insufficient to assign a more specific code.
Do not infer the organism from imaging, culture hints, or geography alone. Check documentation if the note suggests a more specific mycetoma classification.
Do not use for
Do not use this code for other fungal infections, abscesses, or inflammatory masses without documented mycetoma. If the organism is identified, code the specific type instead.
Coding tip
Look for documentation of the organism, site, and whether the case is fungal or bacterial before defaulting to B47.9.