Chorioamnionitis, second trimester, fetus 3

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

Assign this code when documentation clearly indicates chorioamnionitis diagnosed in the second trimester for the third fetus in a multifetal pregnancy. Supporting documentation should include clinical signs of infection (e.g., maternal fever, uterine tenderness, foul-smelling amniotic fluid) and/or laboratory confirmation (e.g., positive amniotic fluid culture).

• Ensure the trimester (second) and fetal number (third) are explicitly documented.
• Do not use for chorioamnionitis occurring in the first or third trimesters, or for single gestations or other fetal numbers.
• Code any associated maternal or fetal complications separately, such as preterm labor or fetal sepsis.