O43.112 Circumvallate placenta, second trimester

Name of the Condition

• Circumvallate Placenta, Second Trimester

Summary

Circumvallate placenta is a placental malformation characterized by a raised, folded edge of the placental membranes. In the second trimester, this condition may be identified during routine prenatal care and requires monitoring to assess potential impacts on pregnancy outcomes, such as fetal growth or maternal complications.

Causes

The exact cause of circumvallate placenta is not fully understood, but it may result from abnormal placental development, incomplete attachment of the chorionic membranes, or disruptions in placental vascularization during early pregnancy. Genetic factors or maternal health conditions could also contribute, though specific etiologies are often undetermined.

Risk Factors

• Advanced maternal age.
• Pre-existing maternal conditions (e.g., diabetes, hypertension).
• Multiple pregnancies.
• History of placental abnormalities in prior pregnancies.
• Uterine abnormalities or prior uterine surgery.
• Substance use during pregnancy.

Symptoms

• Vaginal bleeding, which may vary in severity.
• Abdominal pain or cramping.
• Reduced fetal movement.
• Abnormal fetal growth patterns (e.g., growth restriction).
• Maternal hypertension or preeclampsia.
• Premature labor or contractions.

Diagnosis

Diagnosis typically involves ultrasound imaging to assess placental structure and identify the characteristic folded edge. Doppler studies may evaluate blood flow, and maternal monitoring helps detect signs of complications. Additional testing, such as fetal growth assessments, may be performed to evaluate potential impacts on the pregnancy.

Treatment Options

Management depends on the severity of symptoms and pregnancy stage. Close monitoring of maternal and fetal health is essential. Interventions may include bed rest, medication to manage bleeding or contractions, or early delivery if complications arise. Consultation with a maternal-fetal medicine specialist is often recommended.

Prognosis and Follow-Up

With proper monitoring and management, many pregnancies with circumvallate placenta progress without major issues. However, the condition may increase the risk of complications such as preterm birth or fetal growth restriction. Regular follow-up appointments and imaging studies are typically advised to assess placental function and fetal well-being.

Complications

• Vaginal bleeding, potentially leading to anemia.
• Preterm labor or delivery.
• Fetal growth restriction.
• Placental abruption.
• Increased risk of cesarean delivery.
• Maternal hypertension or preeclampsia.

Lifestyle & Prevention

• Avoid smoking, alcohol, and illicit drug use during pregnancy.
• Maintain a balanced diet and regular prenatal care.
• Manage pre-existing conditions (e.g., diabetes, hypertension) with medical guidance.
• Report any vaginal bleeding or abdominal pain promptly to healthcare providers.

When to Seek Professional Help

Seek immediate medical attention if experiencing:

• Heavy vaginal bleeding.
• Severe abdominal pain or cramping.
• Sudden decrease in fetal movement.
• Signs of preeclampsia (e.g., severe headache, vision changes, swelling).

Tips for Medical Coders

When coding for circumvallate placenta in the second trimester, use the ICD-10-CM code O43.112. Ensure documentation specifies the trimester and confirms the diagnosis via imaging or clinical evaluation. Include details about any associated complications or management plans to support accurate coding. Verify that the code aligns with the clinical scenario and documentation provided.