Neoplasm of uncertain behavior of brain, unspecified

This code signifies a brain tumor where the pathologist cannot definitively classify it as benign or malignant based on current microscopic examination. It indicates that the biological behavior of the neoplasm is currently indeterminate.

Apply this code when pathology reports describe a brain lesion as "neoplasm of uncertain behavior," "atypical neoplasm," or "tumor of uncertain malignant potential" without further specification of the brain region. Documentation must explicitly state the uncertain nature of the tumor.

• Do not use this code if the pathology definitively identifies the tumor as benign (e.g., meningioma) or malignant (e.g., glioblastoma).
• Ensure the documentation specifies the brain as the tumor site; otherwise, an unspecified site code for uncertain behavior may be more appropriate.
• Sequence this code as the primary diagnosis when the uncertain nature of the brain neoplasm is the reason for the encounter or admission.