ICD-10 Code B43.8 – Other forms of chromomycosis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code B43.8 – Other forms of chromomycosis
What it is
B43.8 identifies chromomycosis, also called chromoblastomycosis, when the documented form does not fit a more specific code. It is a chronic fungal infection of skin and subcutaneous tissue.
Clinical signs
Typical findings include slowly enlarging verrucous or warty skin lesions, often on exposed lower extremities. Clinical features vary; refer to documentation, especially if the record describes chronic plaques, nodules, or ulceration.
When to use this code
Use B43.8 when the clinician documents other or unspecified forms of chromomycosis and no more specific subtype is recorded. It is appropriate when pathology, culture, or clinical assessment supports chromomycosis but the exact form is not named. Check documentation if the note only says “fungal infection.”
Do not use for
Do not use this code for other superficial fungal infections, tinea, or candidiasis. If the record identifies a different chromomycosis code or another organism, code that condition instead.
Coding tip
Confirm the provider specifically documents chromomycosis or chromoblastomycosis before assigning B43.8.