O41.1223 Chorioamnionitis, second trimester, fetus 3

Name of the Condition

• Chorioamnionitis, second trimester, fetus 3 (ICD Code: O41.1223)

Summary

Chorioamnionitis is an infection of the fetal membranes (chorion and amnion) and amniotic fluid during the second trimester of pregnancy. This condition involves microbial invasion, typically bacterial, and can affect both maternal and fetal health. The infection may lead to inflammation and complications if not managed promptly. The code specifies the second trimester and fetus 3, indicating documentation of the affected fetus in a multiple gestation pregnancy.

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
• Multiple gestation (as indicated by "fetus 3" in the code)

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. Laboratory tests may include amniotic fluid culture, maternal blood tests for infection, or fetal monitoring. Imaging or ultrasound may be used to assess fetal well-being or detect complications.

Treatment Options

Treatment typically involves antibiotics to target the infection, such as ampicillin and gentamicin. Supportive care may include monitoring maternal and fetal vital signs, hydration, and managing preterm labor if present. In severe cases, delivery may be necessary to protect maternal and fetal health.

Prognosis and Follow-Up

Prognosis depends on the severity of the infection and gestational age. Prompt treatment improves outcomes, but complications like preterm birth or neonatal infection may occur. Follow-up includes monitoring for maternal recovery and fetal development, with additional care if preterm delivery is required.

Complications

• Preterm labor or delivery
• Neonatal sepsis or infection
• Maternal postpartum infection
• Fetal distress or stillbirth
• Long-term developmental issues in the newborn

Lifestyle & Prevention

• Attend regular prenatal care to monitor for infections
• Avoid unnecessary vaginal examinations during pregnancy
• Treat maternal infections promptly (e.g., urinary tract infections)
• Follow guidelines for membrane rupture management
• Practice good hygiene to reduce infection risk

When to Seek Professional Help

Seek immediate medical attention if experiencing fever, abdominal pain, vaginal discharge with a foul odor, or reduced fetal movement. Prompt evaluation is critical to prevent complications.

Tips for Medical Coders

Document the trimester (second) and the specific fetus (fetus 3) in multiple gestation pregnancies to ensure accurate coding. Verify that clinical documentation supports the use of this code, including details about the infection and affected fetus. Code O41.1223 is specific to the second trimester and fetus 3; ensure no conflicting or more specific codes are applicable.