Chorioamnionitis, unsp trimester, not applicable or unsp

This code signifies an inflammatory condition of the fetal membranes (chorion and amnion) and amniotic fluid, occurring during pregnancy. It indicates an infection of the intrauterine environment, which can lead to adverse maternal and fetal outcomes. The specific trimester of onset is not documented or is not applicable.

Apply this code when documentation confirms chorioamnionitis but does not specify the trimester of diagnosis or when the condition is present throughout the pregnancy without a clear onset period. This code is appropriate when the medical record lacks the detail to assign a more specific trimester-based code (O41.121-O41.123).

• Ensure documentation clearly states "chorioamnionitis" without a specified trimester.
• Avoid using this code if the trimester of onset is documented; instead, select the appropriate trimester-specific code.
• Always review for associated conditions, such as premature rupture of membranes (PROM) or preterm labor, and code them separately if present.