Chorioamnionitis, third trimester, fetus 3

This code signifies an infection of the fetal membranes (amnion and chorion) and amniotic fluid occurring during the third trimester of pregnancy, specifically affecting the third fetus in a multiple gestation. It indicates an inflammatory response within the intrauterine environment, potentially impacting fetal and maternal health.

Apply this code when documentation confirms chorioamnionitis diagnosed in the third trimester for the third fetus in a multifetal pregnancy. Supporting documentation should include clinical signs of infection (e.g., maternal fever, uterine tenderness, foul-smelling amniotic fluid), laboratory findings (e.g., elevated maternal white blood cell count), and/or pathological examination of placental tissues.

• Ensure the documentation clearly specifies "third trimester" and identifies the affected fetus as "fetus 3" in a multiple gestation.
• Do not confuse with codes for chorioamnionitis occurring in other trimesters or affecting different fetuses in a multiple pregnancy.
• Code any associated maternal conditions (e.g., fever, sepsis) and fetal conditions (e.g., prematurity, neonatal sepsis) separately.