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"EMG - 5/09 - monofocal demyelinating s/l 'century' lesion in the median nerve near the wrist and ulnar nerve - bilateral." I'm not sure what she is trying to say here.
Depending on the context, it might be either
357.81 Chronic inflammatory demyelinating polyneuritis
or
357.89 Inflammatory and toxic neuropathy, other
You can find that by running a search on "monofocal demyelinating" on Code-XPert
Code-XPert / DevTeam