ICD-10-CM > A00-B99 > A80-A89 > A84 A84 Tick-borne viral encephalitis Non-Billable/Non-Specific Includes tick-borne viral meningoencephalitis Codes A84.0Far Eastern tick-borne encephalitis [Russian spring-summer encephalitis]A84.1Central European tick-borne encephalitisA84.8Other tick-borne viral encephalitisA84.81Powassan virus diseaseA84.89Other tick-borne viral encephalitisA84.9Tick-borne viral encephalitis, unspecified