O41.149 Placentitis, unspecified trimester

Name of the Condition

• Placentitis, Unspecified Trimester (ICD Code: O41.149)

Summary

Placentitis, unspecified trimester, is an inflammatory condition affecting the placenta during pregnancy, typically resulting from infection. This condition can impact maternal and fetal health by compromising placental function, potentially leading to complications such as preterm labor or fetal distress. The inflammation may involve the placental tissue, membranes, or surrounding structures, and timely management is essential to mitigate risks.

Causes

Placentitis often arises from ascending bacterial or viral pathogens from the vaginal tract, though hematogenous spread (via the bloodstream) or direct contamination can also occur. Common pathogens include group B streptococcus, Escherichia coli, and other organisms associated with genitourinary infections. Risk increases with prolonged rupture of membranes or invasive prenatal procedures.

Risk Factors

• Prolonged rupture of membranes (especially >18 hours)
• Multiple vaginal examinations during labor
• Preterm labor or delivery
• Maternal genitourinary infections
• Invasive prenatal procedures
• Immunocompromised maternal status

Symptoms

• Maternal fever or chills
• Uterine tenderness
• Foul-smelling vaginal discharge
• Fetal tachycardia
• Maternal leukocytosis
• Abdominal pain or cramping

Diagnosis

Diagnosis typically involves clinical evaluation of maternal symptoms, laboratory testing (e.g., elevated white blood cell count, C-reactive protein), and ultrasound to assess placental integrity. Amniocentesis may be used to detect infection markers in amniotic fluid.

Treatment Options

Treatment typically includes antibiotics to target the underlying infection, with close monitoring of maternal and fetal status. In severe cases, hospitalization and supportive care may be necessary. Management focuses on mitigating risks to both mother and fetus.

Prognosis and Follow-Up

Prognosis depends on the severity of the infection and timely intervention. Close follow-up is essential to monitor for complications such as preterm labor or fetal distress. Regular prenatal visits and imaging may be required to assess placental and fetal health.

Complications

• Preterm labor or delivery
• Fetal distress or growth restriction
• Maternal sepsis
• Placental abruption
• Neonatal infection

Lifestyle & Prevention

• Practice good prenatal hygiene to reduce infection risk.
• Avoid unnecessary vaginal examinations during pregnancy.
• Seek prompt treatment for genitourinary infections.
• Follow prenatal care guidelines to detect issues early.

When to Seek Professional Help

Seek immediate medical attention if experiencing fever, uterine tenderness, foul-smelling discharge, or fetal movement changes. Early evaluation is critical to prevent complications.

Tips for Medical Coders

Document the trimester when known, as this affects code specificity. If trimester is unspecified, use O41.149. Ensure clinical documentation supports the diagnosis, including symptoms, testing, or treatment related to placental inflammation.