Neoplasm of uncertain behavior of pituitary gland and craniopharyngeal duct

This code signifies a tumor originating in the pituitary gland or craniopharyngeal duct where the biological behavior (benign vs. malignant) cannot be definitively determined from pathological examination. These neoplasms exhibit features that are neither clearly benign nor overtly malignant, requiring further observation or investigation.

Use this code when pathology reports describe a pituitary or craniopharyngeal duct tumor as "atypical," "of uncertain malignant potential," or "borderline." It is appropriate for initial diagnosis when the definitive nature of the tumor is still pending or cannot be established. Documentation must clearly state the uncertain behavior of the neoplasm.

• Do not use this code if the pathology definitively states benign or malignant; instead, code to the appropriate benign or malignant neoplasm category.
• Ensure the documentation specifies the pituitary gland or craniopharyngeal duct as the primary site.
• If subsequent pathology clarifies the tumor's behavior, update the diagnosis to the definitive benign or malignant code.