Other malformation of placenta, first trimester

This code signifies any abnormal structural development or formation of the placenta identified during the first trimester of pregnancy, excluding specific conditions like velamentous or circumvallate placenta. These malformations can impact placental function and fetal development.

Apply this code when documentation clearly indicates a placental malformation, such as a bilobed, succenturiate, or fenestrated placenta, or other unspecified structural anomaly, diagnosed between conception and the end of the 13th week of gestation. Supporting documentation should include ultrasound reports, physician notes, or pathology findings confirming the malformation and the gestational age at diagnosis.

• Ensure the documentation explicitly states "first trimester" for accurate code assignment.
• Differentiate from more specific placental malformation codes (e.g., O43.11- for velamentous insertion) if a more precise diagnosis is available.
• Always sequence this code as a secondary diagnosis following the primary obstetric complication or reason for encounter, if applicable.