ICD-10 Code B39.4 – Histoplasmosis capsulati, unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code B39.4 – Histoplasmosis capsulati, unspecified
What it is
B39.4 identifies histoplasmosis caused by Histoplasma capsulatum when the record does not specify a localized or disseminated form. Use it for a documented Histoplasma capsulatum infection with incomplete detail.
Clinical signs
Clinical features vary; refer to documentation. Patients may have a respiratory illness, fever, cough, fatigue, or other nonspecific findings consistent with histoplasmosis.
When to use this code
Use B39.4 when the provider documents histoplasmosis capsulati but does not state the site, extent, or specific manifestation. It fits cases where the diagnosis is confirmed or treated as histoplasmosis, yet the chart lacks detail for a more specific code. Check documentation if the infection is described as pulmonary, disseminated, or another named form.
Do not use for
Do not use this code when the record identifies a different histoplasmosis type or a more specific manifestation. Do not assign it if documentation only suggests exposure or if another fungal infection is documented.
Coding tip
Choose the most specific histoplasmosis code available; if the note is vague, query for location or dissemination before defaulting to B39.4.