Placentitis, first trimester, other fetus

This code signifies inflammation of the placenta occurring during the first trimester of pregnancy, specifically affecting a fetus other than the first-listed one in a multiple gestation. Placentitis can be caused by various infections and may lead to adverse pregnancy outcomes.

Apply this code when documentation confirms placentitis in a multifetal pregnancy, with the condition diagnosed in the first trimester and affecting a fetus other than the primary one. Supporting documentation should clearly specify the trimester, the affected fetus (e.g., fetus B, fetus 2), and the diagnosis of placentitis.

• Ensure the documentation explicitly states "first trimester" and identifies the specific fetus affected in a multiple gestation.
• Distinguish from codes for placentitis affecting the first fetus (O41.1411-O41.1413) or unspecified fetus (O41.1410).
• Code any underlying infectious agent if identified and documented.