Chorioamnionitis, third trimester, fetus 2

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 second fetus in a multiple gestation. This condition can lead to significant maternal and fetal complications, including preterm labor, sepsis, and neonatal morbidity.

Apply this code when documentation clearly indicates a diagnosis of chorioamnionitis in a pregnant patient who is in her third trimester, and the infection is specifically attributed to the second fetus in a twin or higher-order pregnancy. Supporting documentation would include clinical findings such as maternal fever, uterine tenderness, foul-smelling amniotic fluid, and laboratory evidence of infection.

• Ensure the trimester and fetal number are explicitly documented to support the specificity of this code.
• Do not confuse this with chorioamnionitis affecting a different fetus in a multiple gestation (e.g., fetus 1, fetus 3).
• Code any associated maternal conditions or complications, such as preterm labor or sepsis, in addition to this code.