Chorioamnionitis, second trimester, fetus 4

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 fourth fetus in a multiple gestation. Chorioamnionitis is a serious condition that can lead to preterm labor, fetal distress, and maternal sepsis.

Use this code when documentation confirms chorioamnionitis in a pregnancy that has reached the second trimester (typically weeks 13-27), and the infection is attributed to the fourth fetus in a multifetal pregnancy. Supporting documentation includes physician notes detailing the diagnosis, trimester, and specific fetus affected in a multiple gestation.

• Ensure the documentation clearly specifies "second trimester" and identifies the "fourth fetus" in a multiple gestation.
• Do not use this code for chorioamnionitis occurring in the first or third trimester, or for a singleton pregnancy.
• Sequence this code as a secondary diagnosis when the primary reason for the encounter is related to the chorioamnionitis or its complications.