P37.2 Neonatal (disseminated) listeriosis

Name of the Condition

• Neonatal (disseminated) listeriosis (ICD-10-CM Code: P37.2)

Summary

Neonatal disseminated listeriosis is a severe infection in newborns caused by Listeria monocytogenes, characterized by widespread systemic involvement. The condition typically presents in the early neonatal period and can affect multiple organ systems, including the bloodstream, central nervous system, and other tissues. Early recognition and prompt treatment are critical due to the potential for rapid progression and serious complications.

Causes

The infection results from transplacental transmission of Listeria monocytogenes from an infected mother to the fetus during pregnancy. The bacteria can cross the placenta, leading to fetal infection, or be acquired during delivery via exposure to maternal genital tract colonization. Listeria is a facultative intracellular pathogen that can survive in harsh environments, facilitating transmission.

Risk Factors

• Maternal infection with Listeria monocytogenes during pregnancy, particularly in the third trimester
• Consumption of contaminated food (e.g., unpasteurized dairy, deli meats, or raw produce)
• Maternal immunocompromised status (e.g., diabetes, HIV, or steroid use)
• Lack of prenatal screening for Listeria exposure
• Preterm birth or low birth weight

Symptoms

Symptoms may include sepsis, respiratory distress, lethargy, poor feeding, jaundice, or meningitis. Skin lesions (granulomatosis infantiseptica) or organomegaly may also occur. Onset can be early (within 48 hours of birth) or late (up to several weeks), with disseminated disease often presenting with nonspecific signs of infection.

Diagnosis

Diagnosis involves clinical evaluation, maternal history, and laboratory testing. Blood or cerebrospinal fluid cultures are key for identifying Listeria. PCR or antigen detection may be used for rapid confirmation. Imaging (e.g., ultrasound or MRI) can assess organ involvement, and maternal serology may support exposure history.

Treatment Options

Treatment typically includes intravenous antibiotics (e.g., ampicillin or penicillin) with or without an aminoglycoside. Duration depends on severity and response. Supportive care (e.g., respiratory support, fluid management) is often necessary. Close monitoring for complications is essential during and after therapy.

Prognosis and Follow-Up

Prognosis varies with early treatment and absence of severe complications. Disseminated disease carries higher risks of mortality or long-term neurologic sequelae. Follow-up includes monitoring for developmental delays, hearing or vision issues, and recurrent infections. Regular pediatric evaluations are recommended.

Complications

Potential complications include meningitis, septic shock, respiratory failure, or multiorgan dysfunction. Neurologic sequelae (e.g., hydrocephalus, cerebral palsy) may occur. Chronic infections or relapses are rare but possible without adequate treatment.

Lifestyle & Prevention

Prevention focuses on maternal hygiene and food safety: avoid unpasteurized dairy, raw meats, and contaminated produce. Proper handwashing and cooking practices reduce risk. Prenatal care should include education on high-risk foods and prompt evaluation of maternal fever or infection symptoms.

When to Seek Professional Help

Seek immediate medical attention if a newborn shows signs of infection (e.g., fever, poor feeding, lethargy, or respiratory distress), especially if maternal exposure to Listeria is suspected. Early intervention improves outcomes.

Tips for Medical Coders

Document the presence of disseminated disease (e.g., sepsis, meningitis, or organ involvement) to support the P37.2 code. Include details on maternal history, clinical findings, and laboratory confirmation of Listeria when available. Ensure coding aligns with the specificity of neonatal presentation and avoids ambiguity in documentation.