Placentitis, third trimester, fetus 1

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

Apply this code when documentation confirms placentitis in a pregnant patient who is in her third trimester, and the condition is attributed to the first fetus in a multifetal pregnancy. Supporting documentation would include pathology reports, ultrasound findings, or physician notes explicitly stating placentitis and the gestational age.

• Ensure the documentation specifies "third trimester" and identifies the affected fetus as "fetus 1" in a multiple gestation.
• Do not use this code for placental inflammation occurring in the first or second trimester; specific codes exist for those scenarios.
• Always sequence this code after any underlying infectious agent if identified and documented.