Other malformation of placenta, third trimester

This code signifies any congenital structural abnormality of the placenta, other than vasa previa or velamentous insertion, identified during the third trimester of pregnancy. These malformations can affect placental function and potentially impact fetal well-being or the course of delivery.

Assign this code when documentation specifies a placental malformation, such as a circumvallate placenta, placenta accreta (not specified as total or partial), or other unspecified structural anomaly, that is diagnosed or noted in the third trimester. This applies when the specific type of malformation is not further detailed by a more specific code.

• Ensure the documentation explicitly states "third trimester" for accurate trimester assignment.
• Distinguish from more specific placental malformation codes (e.g., O43.11x for vasa previa, O43.12x for velamentous insertion).
• Always sequence this code as a secondary diagnosis, following the primary obstetric complication or outcome.