Abnormal results of function studies of prph nervous sys

This code signifies abnormal findings from various diagnostic tests assessing the function of peripheral nerves, excluding those specifically related to nerve conduction studies or electromyography. It indicates that objective measurements of peripheral nerve activity, other than electrical impulse velocity or muscle response, have deviated from normal parameters. These abnormalities suggest potential underlying peripheral nervous system dysfunction.

Use this code when documentation indicates abnormal results from functional studies of the peripheral nervous system, such as quantitative sensory testing (QST) or autonomic function tests (e.g., sudomotor function tests, heart rate variability) that are not separately classifiable. This code is appropriate when the specific nature of the peripheral nerve abnormality is not yet definitively diagnosed or when the abnormal findings are the primary reason for the encounter.

• Do not use this code if a more specific diagnosis for the peripheral nervous system disorder is known and documented.
• Distinguish from codes for abnormal nerve conduction studies (R94.11x) or abnormal electromyography (R94.12x).
• Ensure the documentation clearly specifies the type of "other function study" performed and the abnormal findings.