O41.1294 Chorioamnionitis, unspecified trimester, fetus 4

Name of the Condition

• Chorioamnionitis, Unspecified Trimester, Fetus 4 (ICD Code: O41.1294)

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

Diagnosis

Diagnosis is typically based on clinical criteria, including maternal fever, uterine tenderness, and fetal tachycardia, often supported by laboratory tests such as maternal white blood cell count or amniotic fluid cultures. Imaging or ultrasound may be used to assess fetal well-being or detect complications.

Treatment Options

Treatment usually involves intravenous antibiotics to target common pathogens, with delivery often recommended if the infection is severe or the pregnancy is near term. Supportive care, such as hydration and monitoring, may also be provided.

Prognosis and Follow-Up

With prompt treatment, outcomes for both mother and fetus can improve, though complications like preterm birth or neonatal infection may still occur. Follow-up care focuses on monitoring for recurrent infection or long-term effects.

Complications

• Preterm labor or delivery
• Neonatal sepsis or pneumonia
• Maternal postpartum infection
• Fetal distress or stillbirth

Lifestyle & Prevention

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

When to Seek Professional Help

Contact a healthcare provider immediately if experiencing fever, abdominal pain, or reduced fetal movement during pregnancy, as these may indicate chorioamnionitis or other complications.

Tips for Medical Coders

Use this code when documenting chorioamnionitis in an unspecified trimester affecting fetus 4. Ensure clinical documentation supports the diagnosis and specifies the fetus number to justify the code. Verify that trimester and fetus details align with the patient’s pregnancy history.