ICD-10 Code B38 – Coccidioidomycosis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code B38 – Coccidioidomycosis
What it is
B38 identifies coccidioidomycosis, a fungal infection caused by inhaling Coccidioides spores. It may affect the lungs first and can remain localized or spread beyond the respiratory system.
Clinical signs
Clinical features vary; refer to documentation. Commonly noted findings include cough, fever, chest discomfort, fatigue, and sometimes rash or joint pain when the infection is more widespread.
When to use this code
Use B38 when the record documents coccidioidomycosis, valley fever, or Coccidioides infection. Apply it for confirmed disease in any site, including pulmonary or disseminated involvement. If the note only mentions exposure or testing without diagnosis, do not code it.
Do not use for
Do not use B38 for nonspecific pneumonia, other fungal infections, or merely suspected coccidioidomycosis. Check documentation if the provider has not confirmed the organism or disease.
Coding tip
Code the documented site and severity first, and verify whether the infection is pulmonary, disseminated, or unspecified.