Neoplm of uncrt behav of prph nerves and autonm nervous sys

This code signifies a tumor originating from peripheral nerves or the autonomic nervous system where the pathologist cannot definitively classify it as benign or malignant. These neoplasms exhibit features that are ambiguous, preventing a clear diagnosis of either non-cancerous or cancerous behavior.

Apply this code when pathology reports describe a nerve sheath tumor or ganglioneuroma with uncertain or unknown malignant potential. Documentation must explicitly state "uncertain behavior," "unknown behavior," or similar terminology, indicating the pathologist could not determine if the tumor is benign or malignant.

• Ensure the pathology report explicitly states "uncertain behavior" for a peripheral nerve or autonomic nervous system neoplasm.
• Do not use this code if the tumor is definitively diagnosed as benign (e.g., schwannoma) or malignant (e.g., malignant peripheral nerve sheath tumor).
• Remember the Excludes1 note: never code this with D48.7 (neoplasm of uncertain behavior of peripheral nerves of orbit).