O41.1229 Chorioamnionitis, second trimester, other fetus

Name of the Condition

• Chorioamnionitis, second trimester, other fetus (ICD Code: O41.1229)

Summary

Chorioamnionitis is an infection of the fetal membranes (chorion and amnion) and amniotic fluid during the second trimester of pregnancy, affecting an unspecified fetus other than the first. 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, maternal or fetal tachycardia, uterine tenderness, and foul-smelling amniotic fluid (if present). Laboratory tests may include amniotic fluid culture, maternal blood cultures, or inflammatory markers (e.g., C-reactive protein). Imaging or fetal monitoring may be used to assess fetal well-being.

Treatment Options

Treatment typically involves intravenous antibiotics (e.g., ampicillin and gentamicin) to target common pathogens. Delivery may be recommended if the infection is severe or if fetal distress is present. Supportive care, such as hydration and monitoring, is also provided.

Prognosis and Follow-Up

Prognosis depends on the severity of the infection and gestational age. Prompt treatment reduces risks of complications, but preterm delivery or fetal infection may still occur. Follow-up includes monitoring for maternal recovery and fetal well-being post-delivery.

Complications

• Preterm labor or delivery
• Fetal infection (e.g., sepsis, pneumonia)
• Maternal sepsis or endometritis
• Long-term neurodevelopmental issues in the infant

Lifestyle & Prevention

• Attend regular prenatal care to monitor for infections
• Avoid unnecessary vaginal examinations
• Seek prompt treatment for urinary tract or other infections
• Follow guidelines for membrane rupture management

When to Seek Professional Help

Contact a healthcare provider if experiencing fever, abdominal pain, or reduced fetal movement during pregnancy. Immediate care is needed for signs of infection or fetal distress.

Tips for Medical Coders

Document the specific fetus affected (other than fetus 1) and trimester details to support code assignment. Ensure clinical documentation aligns with the "other fetus" designation to accurately reflect the condition.