A32.11 Listerial meningitis

Name of the Condition

• Listerial meningitis (ICD-10 Code: A32.11)

Summary

Listerial meningitis is a bacterial infection of the meninges (the protective membranes covering the brain and spinal cord) caused by Listeria monocytogenes. It is a severe form of listeriosis that primarily affects the central nervous system, leading to inflammation and potential 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.

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
• 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 prevent severe complications, such as brain damage or death.

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, such as neurological deficits.

Complications

• Seizures or epilepsy
• Brain damage or cognitive impairment
• Hearing loss or other sensory deficits
• Death (in severe or untreated cases)

Lifestyle & Prevention

• Avoid unpasteurized dairy products and ready-to-eat deli meats.
• Practice proper food handling and cooking to kill bacteria.
• Wash fruits and vegetables thoroughly.
• Maintain good hygiene, especially when handling raw meat or soil.

When to Seek Professional Help

Seek immediate medical attention if you experience symptoms like severe headache, stiff neck, fever, confusion, or seizures, as these may indicate meningitis.

Tips for Medical Coders

Document the presence of Listeria monocytogenes in cerebrospinal fluid or blood cultures to support the diagnosis. Ensure the code A32.11 is used when listerial meningitis is confirmed, and differentiate it from other forms of meningitis or listeriosis as needed.