Placentitis, third trimester, other fetus

This code signifies inflammation of the placenta occurring in the third trimester of a multifetal pregnancy, specifically affecting a fetus other than the first one. Placentitis can be caused by infection and may lead to adverse pregnancy outcomes.

Apply this code when documentation confirms placental inflammation in the third trimester of a multiple gestation, and the affected placenta is associated with the second or subsequent fetus. This diagnosis requires clear identification of the affected fetus in the medical record.

• Ensure the documentation specifies "third trimester" and "other fetus" in a multifetal pregnancy.
• Do not use for placentitis affecting the first fetus; refer to codes O41.141- or O41.142-.
• Code any underlying infectious agent if identified and documented.