Other tick-borne viral encephalitis

This code identifies viral encephalitis caused by a tick-borne pathogen not specifically classified elsewhere. It signifies inflammation of the brain resulting from a viral infection transmitted by a tick bite, where the specific viral agent is known to be tick-borne but lacks a more precise ICD-10-CM code.

Apply this code when documentation confirms a diagnosis of viral encephalitis and specifies a tick-borne etiology, but the particular virus (e.g., Powassan, Kyasanur Forest disease) is not represented by a more specific code within the A84 category. Supporting documentation should include laboratory confirmation of a tick-borne viral infection or strong clinical evidence in an endemic area.

• Ensure documentation explicitly states "tick-borne" and "viral encephalitis" for accurate code assignment.
• Review the entire A84 category to confirm no more specific code exists for the identified tick-borne viral agent.
• Code any associated neurological manifestations or sequelae separately, if applicable and documented.