O41.1234 Chorioamnionitis, third trimester, fetus 4

Name of the Condition

• Chorioamnionitis, Third Trimester, Fetus 4 (ICD Code: O41.1234)

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 is typically based on clinical criteria, including maternal fever, uterine tenderness, and fetal tachycardia, often with laboratory confirmation of infection (e.g., elevated maternal white blood cell count). Amniotic fluid cultures or placental examination may be used to confirm microbial presence. Imaging or fetal monitoring may assess fetal well-being.

Treatment Options

Treatment usually involves intravenous antibiotics to target common pathogens. Delivery may be expedited if the infection is severe or if fetal distress is present. Supportive care, such as hydration and monitoring, is also provided. The choice of antibiotics depends on local resistance patterns and maternal allergies.

Prognosis and Follow-Up

With prompt treatment, outcomes for both mother and fetus can improve, though complications may still occur. Follow-up care includes monitoring for postpartum infections and assessing neonatal health. Long-term prognosis depends on the severity of the infection and any resulting complications.

Complications

• Maternal sepsis or postpartum infections
• Preterm birth
• 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 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. Urgent care is needed if membranes rupture prematurely or if signs of infection (e.g., foul-smelling discharge) are present.

Tips for Medical Coders

Document the presence of chorioamnionitis in the third trimester affecting fetus 4, including clinical findings (e.g., fever, uterine tenderness) and any confirmatory tests. Ensure the code O41.1234 is used when the condition is specified for fetus 4, and note the trimester and fetal involvement for accurate coding.