Chorioamnionitis, second trimester, not applicable or unsp

This code signifies an inflammatory condition of the fetal membranes (chorion and amnion) and amniotic fluid occurring during the second trimester of pregnancy. It is typically caused by a bacterial infection ascending from the vagina or cervix, leading to potential complications for both mother and fetus.

Apply this code when documentation confirms chorioamnionitis diagnosed during the second trimester (weeks 14 through 27+6 days of gestation). This diagnosis is often supported by clinical signs such as maternal fever, uterine tenderness, foul-smelling amniotic fluid, and fetal tachycardia, or laboratory findings like elevated white blood cell count.

• Ensure the documentation explicitly states "second trimester" for accurate code assignment.
• If the trimester is specified as first or third, a different code from the O41.1- series will be required.
• Always sequence this code after the primary obstetric complication or condition if applicable.