P37.1 Congenital toxoplasmosis

Name of the Condition

• Congenital toxoplasmosis (ICD-10-CM Code: P37.1)

Summary

Congenital toxoplasmosis is a condition where a fetus acquires Toxoplasma gondii infection in utero, leading to potential health issues at birth or later in life. The infection can affect multiple organ systems, with severity varying based on timing of maternal exposure and fetal susceptibility.

Causes

The condition results from transplacental transmission of the Toxoplasma gondii parasite from an infected mother to the fetus during pregnancy. Primary maternal infection, especially in the first or second trimester, increases the risk of congenital transmission.

Risk Factors

• Maternal primary infection during pregnancy (particularly in the first two trimesters)
• Lack of prenatal screening for toxoplasmosis
• Maternal exposure to contaminated soil, undercooked meat, or cat feces
• Immunocompromised maternal status (e.g., HIV, organ transplant recipients)

Symptoms

Symptoms may include chorioretinitis, hydrocephalus, intracranial calcifications, hepatosplenomegaly, jaundice, or neurologic abnormalities. Some infants may present with subtle signs or be asymptomatic at birth, with symptoms emerging later.

Diagnosis

Diagnosis involves maternal serologic testing (IgG/IgM) to assess infection timing, fetal ultrasound for abnormalities, and neonatal testing (serology, PCR, or CSF analysis). Postnatal evaluation may include ophthalmologic and neurologic assessments.

Treatment Options

Treatment typically includes antiparasitic therapy (e.g., pyrimethamine, sulfadiazine) and folinic acid for the infant. Maternal treatment during pregnancy may reduce transmission risk. Long-term management focuses on monitoring and addressing specific organ involvement.

Prognosis and Follow-Up

Prognosis depends on infection timing and severity. Early treatment improves outcomes, but some infants may develop chronic complications like vision loss or developmental delays. Regular follow-up with pediatric infectious disease, ophthalmology, and neurology specialists is recommended.

Complications

Potential complications include vision impairment, seizures, developmental delays, hearing loss, or recurrent infections. Severe cases may involve multiorgan dysfunction or fatal outcomes.

Lifestyle & Prevention

Preventive measures include avoiding undercooked meat, unwashed produce, and contact with cat litter. Pregnant individuals should practice hand hygiene after handling raw meat or soil. Prenatal screening and prompt treatment of maternal infection can reduce transmission risk.

When to Seek Professional Help

Seek medical attention if a newborn shows signs of infection (e.g., jaundice, seizures, poor feeding) or if maternal exposure to toxoplasmosis is suspected. Early evaluation is critical for timely intervention.

Tips for Medical Coders

Document maternal infection timing, fetal testing results, and neonatal manifestations. Specify if the infection is confirmed or suspected, and include details on organ involvement (e.g., chorioretinitis, hydrocephalus) to support code assignment. Ensure alignment with clinical documentation for accurate coding.