Malformation of placenta, unspecified, first trimester

This code signifies an abnormal development or structural defect of the placenta identified during the first trimester of pregnancy, where the specific type of malformation is not documented. It indicates a deviation from normal placental anatomy without further detail regarding the nature of the anomaly.

Apply this code when documentation from a first-trimester ultrasound or clinical assessment identifies a placental malformation, but the specific type (e.g., circumvallate, succenturiate lobe) is not specified. This is appropriate when the provider notes "placental anomaly, unspecified" or "malformed placenta" in the first trimester.

• Ensure the documentation explicitly states "first trimester" for accurate trimester assignment.
• Avoid using this code if a more specific placental malformation (e.g., O43.111 for circumvallate placenta) is documented.
• Always review the entire medical record for any subsequent clarification of the placental anomaly that would allow for a more specific code.