Chorioamnionitis, third trimester, fetus 1

This code signifies an infection of the fetal membranes (amnion and chorion) and amniotic fluid occurring during the third trimester of pregnancy. It specifically identifies this condition as affecting the first fetus in a multiple gestation pregnancy.

Apply this code when documentation confirms chorioamnionitis diagnosed in the third trimester for the first fetus. This typically involves clinical signs of infection (e.g., maternal fever, uterine tenderness, foul-smelling amniotic fluid) and/or laboratory findings.

• Ensure the documentation clearly specifies "third trimester" and identifies the affected fetus (Fetus 1).
• Do not use this code for chorioamnionitis occurring in the first or second trimester; use the appropriate trimester-specific code.
• Code any associated maternal conditions or complications, such as sepsis, in addition to this code.