Chorioamnionitis, first trimester, fetus 1

This code signifies an inflammatory condition of the fetal membranes (chorion and amnion) and amniotic fluid, specifically occurring during the first trimester of pregnancy. It indicates that the infection or inflammation is affecting the first fetus in a multiple gestation pregnancy.

Use this code when documentation clearly states chorioamnionitis diagnosed in the first trimester, and the patient is carrying twins or higher-order multiples, with the condition attributed to the first fetus. Supporting documentation should include physician notes detailing the diagnosis, gestational age at diagnosis, and identification of the affected fetus.

• Ensure the documentation specifies "first trimester" and "fetus 1" to accurately assign this code.
• Do not confuse with codes for chorioamnionitis occurring in later trimesters or affecting different fetuses.
• Always sequence this code after the primary obstetric complication code, if applicable, and in conjunction with codes for any associated maternal conditions or infections.