Mumps encephalitis

This code represents inflammation of the brain caused by the mumps virus. It is a rare but serious complication of mumps infection, characterized by neurological symptoms.

Use this code when documentation explicitly states a diagnosis of encephalitis directly attributed to a mumps infection. This typically occurs in patients presenting with neurological signs (e.g., headache, fever, altered mental status, seizures) in the context of a confirmed or suspected mumps infection.

• Always ensure documentation clearly links the encephalitis to mumps.
• Do not use this code for mumps without neurological involvement; use codes for mumps without complication.
• Consider sequencing this code as the primary diagnosis if it is the reason for the encounter.