Adenoviral encephalitis

This code represents an acute inflammatory condition of the brain caused by an adenovirus infection. It is a severe neurological complication that can lead to significant morbidity and, in some cases, mortality. The encephalitis results from the adenovirus directly infecting brain tissue.

Use this code when documentation clearly indicates a diagnosis of encephalitis specifically attributed to an adenoviral infection. This diagnosis is typically supported by laboratory confirmation of adenovirus in cerebrospinal fluid (CSF) or brain biopsy, alongside clinical signs and symptoms of encephalitis.

• Ensure documentation specifies "adenoviral" to differentiate from other viral encephalitides.
• Do not confuse with unspecified viral encephalitis (G05.1) or encephalitis due to other specified viruses.
• Sequence as the primary diagnosis when it is the reason for the encounter; code any associated neurological sequelae or manifestations as secondary diagnoses.