ICD-10 Code B40.7 – Disseminated blastomycosis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code B40.7 – Disseminated blastomycosis
What it is
Disseminated blastomycosis is a fungal infection that has spread beyond the lungs to other parts of the body. It usually reflects systemic disease caused by Blastomyces species.
Clinical signs
Clinical features vary; refer to documentation. Commonly documented findings include fever, weight loss, skin lesions, bone involvement, or other evidence of extrapulmonary spread.
When to use this code
Use B40.7 when the record clearly states disseminated blastomycosis or blastomycosis with spread to multiple organs or sites. You may also use it when the provider documents systemic blastomycosis with extrapulmonary involvement. Check documentation for the specific sites affected if they are listed.
Do not use for
Do not use this code for localized pulmonary blastomycosis without dissemination. If the chart only says suspected, possible, or history of blastomycosis, check documentation before coding.
Coding tip
Assign B40.7 only when dissemination is explicitly documented or clearly supported by the provider’s note.