A20.3 Plague meningitis

Name of the Condition

• Plague meningitis

Summary

Plague meningitis is a rare but severe form of plague caused by the bacterium Yersinia pestis. It involves inflammation of the meninges, the protective membranes surrounding the brain and spinal cord, and typically occurs as a complication of other plague infections, such as bubonic or septicemic plague. Prompt diagnosis and treatment are critical to improve outcomes.

Causes

Plague meningitis is caused by the bacterium Yersinia pestis. The infection usually spreads to the meninges from a primary plague infection, such as bubonic or septicemic plague, through hematogenous dissemination or direct extension. It may also occur as a result of pneumonic plague spreading to the central nervous system.

Risk Factors

• Untreated or inadequately treated primary plague infections (e.g., bubonic or septicemic plague).
• Delayed medical intervention for plague.
• Weakened immune system, which may increase susceptibility to severe complications.
• Exposure to plague-endemic regions or infected animals.

Symptoms

• Severe headache and neck stiffness.
• Fever, chills, and altered mental status (e.g., confusion, lethargy).
• Nausea, vomiting, or sensitivity to light (photophobia).
• Seizures or focal neurological deficits in advanced cases.

Diagnosis

Plague meningitis is diagnosed through a combination of clinical evaluation, imaging (e.g., MRI or CT scan), and laboratory testing. Cerebrospinal fluid (CSF) analysis typically shows elevated white blood cells, increased protein, and decreased glucose. CSF or blood cultures may identify Yersinia pestis, and PCR testing can confirm the diagnosis.

Treatment Options

• Intravenous antibiotics, such as streptomycin, gentamicin, or doxycycline, are the primary treatment.
• Supportive care, including management of increased intracranial pressure and seizures.
• Adjunctive therapies, such as corticosteroids, may be used to reduce inflammation.

Prognosis and Follow-Up

Prognosis depends on the timeliness of treatment and the severity of neurological involvement. Early intervention improves survival rates, but neurological sequelae may occur. Follow-up includes monitoring for complications and rehabilitation as needed.

Complications

• Permanent neurological damage (e.g., cognitive impairment, motor deficits).
• Increased intracranial pressure leading to brain herniation.
• Death, particularly if treatment is delayed.

Lifestyle & Prevention

• Avoid contact with rodents or flea-infested environments in endemic areas.
• Use insect repellent and wear protective clothing in high-risk regions.
• Seek prompt medical care for plague symptoms to prevent progression.
• Follow public health guidelines for plague prevention in endemic zones.

When to Seek Professional Help

Seek immediate medical attention if you experience severe headache, neck stiffness, fever, or altered mental status, especially if you have been exposed to plague or reside in an endemic area.

Tips for Medical Coders

Document the diagnosis of plague meningitis with the ICD-10-CM code A20.3. Ensure clinical documentation supports the presence of meningitis as a complication of plague, including relevant signs, symptoms, and diagnostic findings. Verify that the code is not used for other forms of meningitis without clear association with Yersinia pestis infection.