Malformation of placenta, unspecified, unspecified trimester

This code signifies an abnormal development or structural defect of the placenta that is not further specified. It indicates a congenital anomaly of the placenta itself, rather than a complication arising from its function or position. The specific type of malformation and the trimester of gestation are unknown.

Use this code when documentation indicates a placental malformation, but the specific type (e.g., circumvallate placenta, placenta accreta) is not identified, and the trimester is also not documented. This code is appropriate when the provider notes a "malformed placenta" without further detail.

• Do not use this code if the specific type of placental malformation is documented; instead, choose a more specific O43.1- subcategory.
• Avoid using this code if the trimester is known; select the appropriate O43.10- subcategory with the specified trimester.
• Ensure documentation clearly states a malformation of the placenta, not just a functional abnormality or a condition like placental abruption or previa.