Neoplasm of uncertain behavior of meninges

This code identifies a tumor originating in the meninges (the membranes surrounding the brain and spinal cord) where the pathologist cannot definitively classify it as benign or malignant. These neoplasms exhibit features that are not clearly benign but also lack the unequivocal characteristics of malignancy, requiring further observation or investigation.

This code is appropriate when pathology reports describe a meningeal tumor as "atypical," "borderline," or "of uncertain malignant potential." It should be used when the physician's documentation reflects an inconclusive diagnosis regarding the tumor's behavior, pending further diagnostic workup or long-term follow-up.

• Ensure the pathology report explicitly states "uncertain behavior" or similar terminology for a meningeal neoplasm.
• Do not use this code if the tumor is definitively diagnosed as benign (e.g., meningioma) or malignant (e.g., anaplastic meningioma).
• Review physician notes for any subsequent definitive diagnosis; if one is made, update the code accordingly.