Chorioamnionitis, second trimester, other fetus

This code signifies an inflammation of the fetal membranes (chorion and amnion) and amniotic fluid occurring during the second trimester of pregnancy, affecting a fetus other than the first one in a multiple gestation. It indicates an infection within the uterus that can impact fetal health and pregnancy outcomes.

Use this code when documentation specifies chorioamnionitis diagnosed in the second trimester for a specific fetus in a multiple pregnancy, and the condition is not further specified as acute or chronic. The medical record should clearly identify the affected fetus (e.g., "fetus B," "second twin") and the gestational age at diagnosis.

• Ensure the documentation specifies "second trimester" and identifies the affected fetus in a multiple gestation.
• Distinguish from O41.12X0 (unspecified fetus) or O41.12X1 (first fetus) for accurate reporting.
• Code any associated maternal infections or fetal complications separately, if documented.