Infct of amniotic sac and membrns, unsp, unsp tri, fetus 1

This code signifies an infection of the amniotic fluid and surrounding membranes (chorioamnionitis) during pregnancy, where the specific type of infection is not documented. It indicates an infection affecting the first fetus in a multiple gestation, with the trimester of onset also unspecified.

Apply this code when documentation confirms chorioamnionitis in a multifetal pregnancy, but the specific pathogen is unknown, and the trimester of diagnosis is not explicitly stated. This code is appropriate when the medical record clearly identifies the infection as impacting the first fetus.

• Ensure documentation specifies "fetus 1" in a multiple gestation; otherwise, an unspecified fetus code should be considered.
• Avoid using this code if the specific type of infection (e.g., bacterial, viral) or the trimester is documented; instead, use a more specific code from the O41.1- series.
• Always sequence this code after any codes for the underlying cause of the infection, if known and documented.