Chorioamnionitis, third trimester, fetus 4

This code signifies an infection of the fetal membranes and amniotic fluid (chorioamnionitis) occurring during the third trimester of pregnancy, specifically affecting the fourth fetus in a multiple gestation. This condition can lead to significant maternal and fetal complications, including preterm labor, sepsis, and neonatal infection.

Use this code when documentation clearly indicates a diagnosis of chorioamnionitis in a pregnant patient who is in her third trimester, and the infection is specifically attributed to the fourth fetus in a multifetal pregnancy. Supporting documentation should include clinical signs of infection (e.g., fever, uterine tenderness, foul-smelling amniotic fluid) and/or laboratory confirmation.

• Ensure the trimester is explicitly documented as "third trimester" and not just "late pregnancy."
• Verify that the documentation specifies "fetus 4" to accurately assign this highly specific code for multiple gestations.
• Code any associated maternal or fetal complications, such as preterm labor or fetal distress, separately.