Personal history of neoplasm of uncertain behavior

This code indicates a patient's past medical history of a tumor that was classified as having uncertain behavior. This means the tumor's potential to become malignant or remain benign could not be definitively determined at the time of diagnosis and treatment. The patient is no longer actively being treated for this specific neoplasm.

Use this code when documenting a patient's history of a neoplasm that was pathologically identified as uncertain, and the patient is now in a surveillance or follow-up phase. It is appropriate for patients who have completed treatment for such a lesion and are presenting for unrelated conditions or routine check-ups.

• Do not use this code for current neoplasms of uncertain behavior; use the appropriate C79.x codes for active disease.
• Ensure documentation clearly states the neoplasm was of "uncertain behavior" and is no longer active.
• This code is often used as a secondary diagnosis to provide a comprehensive medical history.