ICD-10 Code B39.1 – Chronic Pulmonary Histoplasmosis Capsulati (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code B39.1 – Chronic pulmonary histoplasmosis capsulati
What it is
B39.1 identifies chronic lung infection caused by Histoplasma capsulatum. Use it when documentation shows a persistent pulmonary form of histoplasmosis rather than an acute, disseminated, or unspecified infection.
Clinical signs
Typical findings include chronic cough, weight loss, fever, and chest imaging abnormalities that resemble other chronic pulmonary diseases. Clinical features vary; refer to documentation.
When to use this code
Use B39.1 when the provider documents chronic pulmonary histoplasmosis capsulati or a chronic lung infection due to Histoplasma capsulatum. It is appropriate when the record clearly distinguishes the pulmonary chronic form from other histoplasmosis presentations. Check documentation if the site or form is not specified.
Do not use for
Do not use this code for unspecified histoplasmosis or for nonpulmonary disease forms. If the record only says histoplasmosis without chronic lung involvement, code to the documented type or check documentation.
Coding tip
Confirm both the chronic nature and pulmonary involvement in the provider note before assigning B39.1.