B38.4 Coccidioidomycosis meningitis

Name of the Condition

• Coccidioidomycosis meningitis

Summary

Coccidioidomycosis meningitis is a fungal infection of the meninges caused by Coccidioides species. It is a severe, disseminated form of coccidioidomycosis, where the infection spreads from the lungs to the central nervous system. The condition typically presents with neurological symptoms and requires prompt diagnosis and treatment to prevent complications.

Causes

The infection results from inhaling airborne spores of Coccidioides fungi, which are endemic to arid regions such as the southwestern United States, Mexico, and parts of Central and South America. These spores are released from soil and can become airborne during activities that disturb the ground, including construction, farming, or windstorms. Inhalation of the spores leads to infection, with the lungs being the primary site of involvement before dissemination to the meninges.

Risk Factors

• Residence or travel to endemic regions, especially during dry, dusty seasons.
• Occupational exposure to soil (e.g., farmers, construction workers, archaeologists).
• Immunocompromised states, including HIV/AIDS, organ transplantation, or prolonged corticosteroid use.
• Pregnancy, particularly the third trimester.
• Advanced age.

Symptoms

• Severe headache.
• Neck stiffness or pain.
• Fever, nausea, or vomiting.
• Altered mental status or confusion.
• Photophobia (sensitivity to light).
• Seizures or focal neurological deficits.

Diagnosis

Diagnosis involves clinical evaluation, imaging (e.g., MRI or CT of the brain), and laboratory testing. Cerebrospinal fluid (CSF) analysis may show elevated white blood cells, protein, and low glucose, with fungal cultures or antigen testing confirming Coccidioides infection. Serological tests, such as complement fixation, may also be used to detect antibodies.

Treatment Options

Treatment typically involves long-term antifungal therapy, such as fluconazole or amphotericin B, to target the infection in the central nervous system. The duration of therapy is often extended due to the risk of relapse. Adjunctive measures, including managing increased intracranial pressure, may be necessary in severe cases.

Prognosis and Follow-Up

Prognosis depends on early diagnosis and treatment, as well as the patient’s immune status. Untreated or delayed treatment can lead to permanent neurological damage or death. Long-term follow-up is essential to monitor for relapse or complications, with periodic CSF testing and imaging recommended.

Complications

• Permanent neurological deficits (e.g., hearing loss, cognitive impairment).
• Hydrocephalus or increased intracranial pressure.
• Recurrent meningitis.
• Disseminated infection affecting other organs.

Lifestyle & Prevention

• Avoid exposure to dust in endemic regions, especially during dry seasons.
• Use respiratory protection (e.g., masks) during activities that disturb soil.
• Maintain a healthy immune system through proper nutrition and avoiding immunosuppressive behaviors.
• Seek prompt medical attention for respiratory symptoms in endemic areas.

When to Seek Professional Help

Seek immediate medical care if experiencing severe headache, neck stiffness, fever, or neurological symptoms, particularly after travel to or residence in endemic regions. Early intervention is critical to prevent progression to meningitis.

Tips for Medical Coders

When coding for coccidioidomycosis meningitis, use ICD-10-CM code B38.4. Ensure documentation supports the diagnosis of meningitis as a complication of coccidioidomycosis, including clinical findings, imaging, or laboratory results. Verify that the code is not used for other forms of fungal meningitis or non-disseminated coccidioidomycosis.