Neoplasm of uncertain behavior of placenta

This code represents an abnormal growth of placental tissue that cannot definitively be classified as benign or malignant. It indicates a tumor with features that are ambiguous, requiring further investigation to determine its ultimate biological behavior. This condition is distinct from a normal placenta or a clearly cancerous growth.

Use this code when pathology reports describe a placental neoplasm as "uncertain behavior," "borderline," or "indeterminate." It is appropriate for cases where the pathologist cannot definitively categorize the lesion as either benign or malignant based on current microscopic examination. Documentation must clearly state the uncertain nature of the placental growth.

• Do not use this code for a hydatidiform mole, which has its own specific codes (e.g., O01.9).
• Ensure the pathology report explicitly uses terms indicating "uncertain behavior" for the placenta.
• If a definitive diagnosis of benign or malignant is later established, update the code accordingly.