O30.213 Quadruplet pregnancy with two or more monochorionic fetuses, third trimester

Name of the Condition

• Quadruplet pregnancy with two or more monochorionic fetuses, third trimester

Summary

Quadruplet pregnancy with two or more monochorionic fetuses in the third trimester involves a gestation with four fetuses, where at least two share a single placenta. This condition requires specialized prenatal care due to elevated risks for both the mother and fetuses, including complications related to monochorionicity such as twin-to-twin transfusion syndrome. Monitoring focuses on fetal growth, placental health, and maternal well-being as the pregnancy progresses toward delivery.

Causes

Quadruplet pregnancies typically occur when multiple eggs are fertilized (dizygotic) or a single fertilized egg splits (monozygotic). Fertility treatments, such as assisted reproductive technology (ART), can increase the likelihood of multiple embryos implanting. Monochorionicity arises when a single fertilized egg splits, resulting in fetuses sharing a placenta.

Risk Factors

• Advanced maternal age (over 35 years)
• Family history of multiple gestation
• Use of fertility medications or assisted reproductive technology (ART)
• Higher parity (prior pregnancies)

Symptoms

• Rapid uterine growth beyond expected gestational age
• Increased maternal weight gain
• Severe morning sickness or hyperemesis gravidarum
• Sensation of fetal movement earlier than typical

Diagnosis

Diagnosis is confirmed via ultrasound, which visualizes four fetuses and their placentas. Prenatal care includes monitoring for complications like preterm labor or growth restrictions. Additional assessments may evaluate chorionicity and amnionicity, with third-trimester scans focusing on fetal position, growth, and placental function.

Treatment Options

Management focuses on close monitoring, nutritional support, and managing maternal health. Delivery planning may involve specialized obstetric care, with consideration for mode of delivery based on fetal and maternal status. Interventions may address complications like preterm labor or fetal distress.

Prognosis and Follow-Up

Prognosis depends on fetal and maternal health, with higher risks of preterm birth and complications in monochorionic pregnancies. Follow-up includes regular prenatal visits, fetal monitoring, and postpartum care for both mother and infants. Long-term outcomes vary based on gestational age at delivery and any associated complications.

Complications

• Preterm labor and delivery
• Twin-to-twin transfusion syndrome
• Fetal growth restriction
• Placental abnormalities
• Maternal complications (e.g., preeclampsia, anemia)

Lifestyle & Prevention

• Prenatal vitamins and balanced nutrition
• Regular prenatal care
• Monitoring for signs of preterm labor
• Avoiding high-risk activities

When to Seek Professional Help

Seek immediate care for symptoms like vaginal bleeding, severe abdominal pain, reduced fetal movement, or signs of preterm labor. Regular prenatal visits are essential for monitoring fetal and maternal health.

Tips for Medical Coders

Document the presence of monochorionic fetuses and the trimester (third trimester) to support code assignment. Ensure clinical documentation specifies the number of fetuses and chorionicity details, as these are critical for accurate coding.