Cutaneous blastomycosis

This code identifies a fungal infection caused by Blastomyces dermatitidis that primarily affects the skin. It presents as papules, pustules, nodules, or ulcerative lesions, often with a verrucous (wart-like) appearance, and can be a manifestation of disseminated blastomycosis or a primary cutaneous infection.

Use this code when documentation clearly indicates a diagnosis of blastomycosis with primary or significant involvement of the skin. This diagnosis is typically supported by biopsy results showing characteristic fungal elements, culture identification of Blastomyces dermatitidis, or clinical presentation in an endemic area.

• Ensure documentation specifies "cutaneous" blastomycosis to differentiate from other forms.
• Consider co-reporting codes for any associated systemic blastomycosis (e.g., pulmonary, disseminated) if present.
• Do not confuse with other fungal skin infections; confirm the causative organism is Blastomyces.