Placentitis, first trimester, not applicable or unspecified

This code signifies inflammation of the placenta occurring during the first trimester of pregnancy. Placentitis can be caused by various infections and may lead to adverse pregnancy outcomes.

Apply this code when documentation explicitly states placentitis diagnosed in the first trimester, and the specific trimester is not further specified or is not applicable for more granular coding. This diagnosis is typically supported by clinical findings, imaging, or pathological reports.

• Ensure the documentation clearly specifies "first trimester" for placentitis.
• Do not use this code if the trimester is known to be second or third; select the appropriate trimester-specific code.
• Code any underlying infectious agents or associated complications separately.