Other human herpesvirus encephalitis

This code identifies inflammation of the brain caused by a human herpesvirus other than herpes simplex virus (HSV) types 1 or 2, or varicella zoster virus (VZV). It encompasses encephalitis due to less common human herpesviruses, such as Epstein-Barr virus (EBV), cytomegalovirus (CMV), or human herpesvirus 6 (HHV-6), when the specific type is not further specified.

Use this code when documentation confirms encephalitis due to a human herpesvirus, and the specific type is identified as something other than HSV-1, HSV-2, or VZV, but the exact non-HSV/VZV type is not precisely documented. This code is appropriate when laboratory testing confirms a human herpesvirus etiology, but the specific strain is not specified beyond "other."

• Always attempt to code to the highest level of specificity; if the specific human herpesvirus (e.g., CMV, EBV) is identified, use the more precise code.
• Ensure documentation clearly links the encephalitis to a human herpesvirus etiology.
• Do not use this code for encephalitis due to HSV-1, HSV-2, or VZV; specific codes exist for those conditions.