A32.12 Listerial meningoencephalitis

Name of the Condition

• Listerial meningoencephalitis (ICD-10 Code: A32.12)

Summary

Listerial meningoencephalitis is a severe bacterial infection involving both the meninges (protective membranes covering the brain and spinal cord) and the brain tissue itself, caused by Listeria monocytogenes. It is a form of listeriosis that leads to inflammation of the central nervous system, potentially resulting in neurological complications.

Causes

The infection is caused by the Listeria monocytogenes bacterium, which enters the body through contaminated food or, less commonly, other routes. Once in the bloodstream, the bacteria can cross the blood-brain barrier to infect the meninges and brain.

Risk Factors

• Pregnant women and newborns
• Elderly individuals (age 65 and older)
• People with weakened immune systems (e.g., due to HIV, chemotherapy, or organ transplants)
• Individuals with chronic conditions like diabetes or liver disease

Symptoms

• Fever, headache, and stiff neck (classic meningitis signs)
• Confusion, altered mental status, or seizures (indicating encephalitis)
• Nausea, vomiting, or sensitivity to light
• In severe cases, coma or neurological deficits

Diagnosis

Diagnosis is confirmed by identifying Listeria monocytogenes in cerebrospinal fluid (CSF) via lumbar puncture. Blood cultures or PCR testing may also be used to detect the bacterium.

Treatment Options

• Antibiotics like ampicillin and gentamicin are commonly used.
• Prompt treatment is critical to reduce the risk of severe complications.

Prognosis and Follow-Up

Prognosis varies based on the individual's health and the severity of the infection. Recovery often requires follow-up visits to monitor response to treatment and manage any complications.

Complications

• Permanent neurological damage
• Seizures or cognitive impairment
• In severe cases, death

Lifestyle & Prevention

• Avoid unpasteurized dairy products and ready-to-eat deli meats.
• Practice proper food handling and cooking to reduce contamination risk.
• Pregnant women and immunocompromised individuals should take extra precautions with food safety.

When to Seek Professional Help

Seek immediate medical attention if experiencing fever, severe headache, stiff neck, confusion, or seizures, as these may indicate a serious infection.

Tips for Medical Coders

When coding for listerial meningoencephalitis (A32.12), ensure documentation supports both meningeal and encephalitic involvement. Verify that the diagnosis aligns with clinical findings and laboratory confirmation of Listeria monocytogenes.