A87 Viral meningitis

Name of the Condition

• Viral meningitis

Summary

Viral meningitis is an inflammation of the meninges, the protective membranes covering the brain and spinal cord, caused by viral infections. It is typically less severe than bacterial meningitis and often resolves without specific treatment. The condition presents with symptoms such as headache, fever, and neck stiffness, though outcomes are generally favorable with supportive care.

Causes

Viral meningitis is most commonly caused by enteroviruses, which are transmitted through respiratory secretions or fecal-oral routes. Other viruses, including herpesviruses, mumps, measles, and influenza, can also lead to the condition. The infection spreads when individuals come into contact with contaminated surfaces, fluids, or airborne particles from an infected person.

Risk Factors

• Close contact with individuals who have viral infections (e.g., enteroviruses).
• Weakened immune systems, including those with HIV/AIDS or undergoing immunosuppressive therapy.
• Age, with infants and young children being more susceptible.
• Poor hygiene practices, such as inadequate handwashing.
• Living in or traveling to areas with high rates of viral transmission.

Symptoms

• Sudden onset of fever and chills.
• Severe headache, often worse with movement.
• Stiff neck and sensitivity to light (photophobia).
• Nausea and vomiting.
• Altered mental status or confusion in severe cases.
• Fatigue and general malaise.

Diagnosis

Diagnosis involves a combination of clinical evaluation and laboratory testing. A lumbar puncture (spinal tap) is performed to analyze cerebrospinal fluid (CSF) for signs of inflammation, such as elevated white blood cell count and normal glucose levels. Viral PCR testing or cultures of CSF may identify the specific virus. Imaging studies like MRI or CT scans are used to rule out other causes, such as bacterial meningitis or structural abnormalities.

Treatment Options

• Supportive care: Rest, hydration, and over-the-counter pain relievers (e.g., acetaminophen) to manage symptoms.
• Antiviral medications: May be used in specific cases, such as herpesvirus-associated meningitis.
• Hospitalization: Required for severe cases or when complications arise, to monitor for dehydration or neurological changes.

Prognosis and Follow-Up

Most individuals with viral meningitis recover fully within 7–10 days with supportive care. Follow-up care focuses on monitoring for persistent symptoms, such as headaches or fatigue, and ensuring hydration. Rarely, long-term complications like cognitive impairment or hearing loss may occur, necessitating ongoing evaluation.

Complications

• Prolonged headaches or chronic fatigue.
• Hearing loss or vision problems in severe cases.
• Seizures or neurological deficits, though uncommon.
• Recurrent viral infections in immunocompromised individuals.

Lifestyle & Prevention

• Practice good hand hygiene, especially after using the restroom or before eating.
• Avoid close contact with individuals showing signs of viral infections (e.g., cold sores, respiratory symptoms).
• Ensure vaccinations are up to date, particularly for measles, mumps, and influenza.
• Disinfect surfaces regularly in shared spaces (e.g., schools, daycare centers).

When to Seek Professional Help

Seek immediate medical attention if symptoms worsen or include:

• Severe headache unresponsive to pain relievers.
• Stiff neck with fever.
• Confusion, seizures, or difficulty waking.
• Signs of dehydration (e.g., dry mouth, reduced urination).

Tips for Medical Coders

When coding for viral meningitis (ICD-10-CM code A87), ensure documentation supports the diagnosis, including clinical presentation (e.g., fever, headache, neck stiffness) and laboratory findings (e.g., CSF analysis). Differentiate from bacterial meningitis, as coding and treatment approaches vary. Verify that the code aligns with the specific viral cause if identified, and document any complications or comorbidities to support accurate coding.