ICD-10 Code B47.1 – Actinomycetoma (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code B47.1 – Actinomycetoma
What it is
Actinomycetoma is a chronic, localized infection caused by actinomycete bacteria. It typically affects skin and deeper tissues, often on the foot, and can form draining sinus tracts.
Clinical signs
Clinical features vary; refer to documentation. Common findings include slowly enlarging swelling, nodules, and sinus drainage with grains or granules. Bone involvement may be present in advanced disease.
When to use this code
Use B47.1 when the provider documents actinomycetoma or mycetoma caused by actinomycetes. This code fits confirmed cases with chronic subcutaneous infection and characteristic draining lesions. If the organism is not specified, check documentation before coding.
Do not use for
Do not use this code for eumycetoma or other fungal infections, which are coded separately. Do not assume actinomycetoma from a generic “mycetoma” note unless the organism type is documented.
Coding tip
Confirm whether the record identifies actinomycetoma versus eumycetoma, because the organism determines the correct ICD-10 code.