Chorioamnionitis, unspecified trimester, fetus 5

This code signifies an infection of the chorion and amnion, the membranes surrounding the fetus, occurring at an unspecified point during the pregnancy. It indicates inflammation of these fetal membranes, potentially affecting both the mother and the fetus. The "fetus 5" specifier indicates this diagnosis applies to the fifth fetus in a multiple gestation pregnancy.

Use this code when documentation confirms chorioamnionitis in a multiple gestation pregnancy, specifically affecting the fifth fetus, and the trimester of onset is not specified. This typically occurs when the physician explicitly identifies chorioamnionitis in the fifth fetus without detailing the gestational age at diagnosis.

• Ensure the medical record clearly identifies chorioamnionitis and specifies "fetus 5" in a multiple gestation.
• If the trimester is known, a more specific code (O41.121-O41.123 with the appropriate fetus number) should be used.
• Code any associated maternal conditions or complications, such as fever or premature rupture of membranes, separately.