ICD-10-CM > G00-G99 > G00-G09 > G04 > G04.8 G04.8 Other encephalitis, myelitis and encephalomyelitis Non-Billable/Non-Specific Code Also any associated seizure (G40.-, R56.9) Codes G04.81Other encephalitis and encephalomyelitisG04.82Acute flaccid myelitisG04.89Other myelitis