ICD-10 Code B43.2 – Subcutaneous pheomycotic abscess and cyst (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code B43.2 – Subcutaneous pheomycotic abscess and cyst
What it is
B43.2 identifies a fungal infection of the skin and subcutaneous tissue that forms an abscess or cyst. Use it when documentation specifically describes a subcutaneous pheomycotic abscess or cyst.
Clinical signs
Typical findings include a localized, slowly developing subcutaneous mass, swelling, and sometimes tenderness or drainage. Clinical features vary; refer to documentation, especially when the diagnosis is based on pathology or culture.
When to use this code
Assign this code when the provider documents a subcutaneous pheomycotic abscess or cyst, including cases confirmed by biopsy, culture, or surgical pathology. Use it for fungal lesions in the subcutaneous tissue, not for superficial skin infections alone. Check documentation if the record only says “abscess” or “cyst” without fungal wording.
Do not use for
Do not use B43.2 for ordinary bacterial abscesses, epidermoid cysts, or unspecified skin lumps. If the chart does not clearly identify a pheomycotic cause, check documentation.
Coding tip
Code the fungal diagnosis only when the record clearly links the subcutaneous lesion to a pheomycotic infection.