O41.1231 Chorioamnionitis, third trimester, fetus 1

Name of the Condition

• Chorioamnionitis, Third Trimester, Fetus 1 (ICD Code: O41.1231)

Summary

Chorioamnionitis is an infection of the fetal membranes (chorion and amnion) and amniotic fluid during pregnancy. This condition involves microbial invasion, typically bacterial, and can affect both maternal and fetal health. It is often associated with inflammation and may lead to complications if not managed promptly. The infection can occur at any stage of pregnancy but is more common in the second or third trimester.

Causes

The infection usually results from bacteria ascending from the vaginal tract into the uterus, though hematogenous spread (via the bloodstream) or direct contamination can also occur. Common pathogens include group B streptococcus, Escherichia coli, and other vaginal flora. Risk increases with prolonged rupture of membranes or invasive procedures during pregnancy.

Risk Factors

• Prolonged rupture of membranes (especially >18 hours)
• Multiple vaginal examinations during labor
• Preterm labor or delivery
• Maternal infections (e.g., urinary tract infections)
• Low socioeconomic status or limited prenatal care
• History of prior intrauterine infections

Symptoms

• Maternal fever (≥38°C or 100.4°F)
• Maternal tachycardia (≥100 beats per minute)
• Fetal tachycardia (≥160 beats per minute)
• Uterine tenderness
• Foul-smelling amniotic fluid (if membranes are ruptured)

Diagnosis

Diagnosis relies on clinical evaluation of maternal symptoms, laboratory testing for infection markers (e.g., elevated white blood cell count), and ultrasound to assess amniotic fluid and fetal status. Amniocentesis may be used for culture if membranes are ruptured.

Treatment Options

Treatment typically involves intravenous antibiotics to target common pathogens, such as penicillin or clindamycin. Delivery may be expedited if the infection is severe or if fetal distress is present. Supportive care, including monitoring of maternal and fetal vital signs, is also provided.

Prognosis and Follow-Up

Prognosis depends on the severity of the infection and timely management. Most cases resolve with appropriate treatment, but complications can occur if left untreated. Follow-up care includes monitoring for maternal recovery and fetal well-being post-delivery.

Complications

• Maternal sepsis or septic shock
• Preterm labor or delivery
• Fetal distress or stillbirth
• Neonatal sepsis or pneumonia
• Long-term developmental issues in the infant

Lifestyle & Prevention

• Attend regular prenatal care to monitor for infections
• Avoid unnecessary vaginal examinations during pregnancy
• Seek prompt treatment for genitourinary infections
• Practice good hygiene to reduce infection risk

When to Seek Professional Help

Seek immediate medical attention if experiencing fever, uterine tenderness, or foul-smelling vaginal discharge during pregnancy. Early intervention is critical to prevent complications.

Tips for Medical Coders

When coding O41.1231, ensure documentation specifies the third trimester and fetus 1. Verify that the infection is confirmed clinically or via laboratory testing. Include details about maternal symptoms, fetal status, and any interventions performed to support accurate coding.