ICD-10 Code B38.4 – Coccidioidomycosis Meningitis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code B38.4 – Coccidioidomycosis meningitis
What it is
B38.4 identifies meningitis caused by Coccidioides infection, a fungal disease that involves the membranes around the brain and spinal cord. Use it when the record clearly documents coccidioidal meningitis.
Clinical signs
Clinical features vary; refer to documentation. Typical findings may include headache, fever, neck stiffness, and neurologic changes consistent with meningitis, along with evidence that Coccidioides is the cause.
When to use this code
Use B38.4 when the provider documents coccidioidal meningitis, including confirmed or clinically diagnosed infection. It may appear in inpatient, outpatient, or follow-up records when the meningitis is attributed to Coccidioides. Check documentation if the note only says fungal meningitis or coccidioidomycosis without CNS involvement.
Do not use for
Do not use this code for uncomplicated coccidioidomycosis without meningitis, or for other fungal or bacterial meningitis. If the record does not specify meningitis, code the documented coccidioidal condition instead.
Coding tip
Confirm that the provider links meningitis to Coccidioides before assigning B38.4.