Chorioamnionitis, unspecified trimester, fetus 2

This code indicates an inflammation of the fetal membranes (amnion and chorion) and amniotic fluid, occurring at an unspecified point during the pregnancy, specifically affecting the second fetus in a multiple gestation. This condition is typically caused by a bacterial infection ascending from the vagina.

Use this code when documentation confirms chorioamnionitis in a multiple gestation pregnancy, and the specific trimester of onset is not documented, with the condition affecting the second fetus. This diagnosis is often supported by clinical signs such as maternal fever, uterine tenderness, foul-smelling amniotic fluid, and fetal tachycardia.

• Always specify the trimester if documented (e.g., O41.121x for first trimester).
• Ensure the fetus number (e.g., fetus 2) is accurately identified in the documentation for multiple gestations.
• Code any associated maternal infections or complications separately.