Chorioamnionitis, third trimester, other fetus

This code signifies an inflammation of the fetal membranes (chorion and amnion) and amniotic fluid occurring during the third trimester of pregnancy, specifically affecting a fetus other than the one designated as "first" in a multiple gestation. It indicates an intrauterine infection that can impact fetal and maternal health.

Apply this code when documentation explicitly states chorioamnionitis in the third trimester for a specific fetus in a multiple gestation, and that fetus is not the primary one. Supporting documentation would include physician notes detailing the diagnosis, gestational age, and identification of the affected fetus (e.g., "chorioamnionitis affecting fetus B").

• Ensure the documentation specifies "third trimester" and identifies the affected fetus as "other" in a multiple gestation.
• Do not use this code for chorioamnionitis in a singleton pregnancy or for the primary fetus in a multiple gestation.
• Sequence this code after any codes for the underlying cause of the chorioamnionitis, if known.