Mononeuritis multiplex

This code represents a neurological disorder characterized by simultaneous or sequential damage to multiple non-contiguous peripheral nerves. It results in asymmetric motor and sensory deficits in the distribution of the affected nerves. This condition is often a manifestation of an underlying systemic disease.

Assign this code when documentation clearly indicates inflammation or damage affecting multiple distinct peripheral nerves in different areas of the body. Common etiologies include vasculitis, diabetes, Lyme disease, or autoimmune disorders. Documentation should specify "mononeuritis multiplex" or describe the characteristic pattern of multiple, non-contiguous nerve involvement.

• Always code the underlying systemic disease first, if known, as mononeuritis multiplex is often a manifestation of another condition.
• Do not confuse with polyneuropathy (G60-G64), which involves widespread, symmetrical nerve damage.
• Ensure documentation specifies multiple distinct nerves are affected, not just a single nerve or a diffuse, symmetrical pattern.