O41.1225 Chorioamnionitis, second trimester, fetus 5

Name of the Condition

• Chorioamnionitis, second trimester, fetus 5 (ICD Code: O41.1225)

Summary

Chorioamnionitis is an infection of the fetal membranes (chorion and amnion) and amniotic fluid during the second trimester of pregnancy, affecting fetus 5. This condition involves microbial invasion, typically bacterial, and can impact both maternal and fetal health. Inflammation and potential complications may arise if not addressed promptly. The infection is characterized by ascending pathogens from the vaginal tract, though other routes of transmission are possible.

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 pregnancy
• 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 is based on clinical criteria, including maternal fever, uterine tenderness, and fetal tachycardia, often supported by laboratory tests (e.g., elevated maternal white blood cell count) or amniotic fluid analysis. Imaging or cultures may be used to confirm infection, though clinical judgment is key in the second trimester.

Treatment Options

Treatment typically involves broad-spectrum antibiotics to target common pathogens. Close monitoring of maternal and fetal status is essential. In some cases, delivery may be necessary to prevent further complications, especially if the infection is severe or progresses.

Prognosis and Follow-Up

Prognosis depends on the severity of the infection and timely intervention. Complications can include preterm birth, neonatal sepsis, or maternal postpartum infection. Follow-up care focuses on monitoring for recurrence and addressing any residual maternal or fetal health concerns.

Complications

• Preterm labor or delivery
• Neonatal sepsis or infection
• Maternal postpartum infection (e.g., endometritis)
• Fetal distress or growth restriction

Lifestyle & Prevention

• Attend regular prenatal care to detect and manage infections early.
• Avoid unnecessary vaginal examinations during pregnancy.
• Report symptoms like fever or unusual discharge promptly.
• Follow hygiene practices to reduce infection risk.

When to Seek Professional Help

Seek immediate medical attention if experiencing fever, abdominal pain, or reduced fetal movement during the second trimester. Prompt evaluation is critical to prevent complications.

Tips for Medical Coders

Document the specific fetus affected (fetus 5) and trimester (second trimester) to ensure accurate coding. Include clinical details supporting the diagnosis, such as maternal symptoms or laboratory findings, to justify the code assignment.