B00.3 Herpesviral meningitis

Name of the Condition

• Herpesviral meningitis

Summary

Herpesviral meningitis is an inflammation of the meninges, the protective membranes surrounding the brain and spinal cord, caused by the herpes simplex virus (HSV). It is a viral infection that can lead to symptoms such as headache, fever, and neck stiffness. The condition may occur as a primary infection or as a complication of HSV reactivation.

Causes

Herpesviral meningitis is caused by the herpes simplex virus (HSV), typically HSV-2, though HSV-1 can also be involved. The virus enters the central nervous system, leading to inflammation of the meninges. Transmission occurs through direct contact with infected bodily fluids or reactivation of latent virus.

Risk Factors

• Immunocompromised states, such as HIV/AIDS or chemotherapy.
• Prior HSV infection, as the virus can reactivate.
• Close contact with an individual with an active HSV infection.
• Age, with neonates and young adults at increased risk.

Symptoms

• Severe headache
• Fever
• Neck stiffness or pain
• Sensitivity to light (photophobia)
• Nausea or vomiting
• Altered mental status in severe cases

Diagnosis

Diagnosis involves clinical evaluation of symptoms, followed by laboratory tests. Cerebrospinal fluid (CSF) analysis may show elevated white blood cells, increased protein, and normal or low glucose levels. PCR testing of CSF is used to detect HSV DNA, confirming the viral cause.

Treatment Options

• Antiviral medications, such as acyclovir or valacyclovir, to target HSV.
• Supportive care, including pain management and hydration.
• Hospitalization for severe cases or intravenous antiviral therapy.

Prognosis and Follow-Up

Most patients recover fully with appropriate treatment, though some may experience residual symptoms. Follow-up care includes monitoring for recurrence and assessing neurological function. Immunocompromised individuals may require longer treatment durations.

Complications

• Persistent neurological symptoms, such as headaches or cognitive changes.
• Rarely, progression to encephalitis (inflammation of brain tissue).
• Recurrent meningitis in individuals with frequent HSV reactivation.

Lifestyle & Prevention

• Avoid close contact with individuals during active HSV outbreaks.
• Practice safe sex to reduce transmission risk.
• Maintain a healthy immune system through balanced nutrition and regular exercise.
• Seek prompt medical care for suspected HSV infections to prevent complications.

When to Seek Professional Help

Seek immediate medical attention if you experience severe headache, fever, neck stiffness, or confusion, as these may indicate meningitis. Early diagnosis and treatment are critical to prevent severe outcomes.

Tips for Medical Coders

Document the presence of meningitis symptoms, HSV testing results, and treatment provided. Ensure the code B00.3 is used when herpesviral meningitis is the primary diagnosis, with supporting clinical documentation. Note any associated conditions or complications to support accurate coding.