Mumps encephalitis

This code represents inflammation of the brain caused by the mumps virus. It is a neurological complication of mumps infection, characterized by symptoms such as fever, headache, stiff neck, and altered mental status.

Use this code when documentation explicitly states a diagnosis of mumps encephalitis. This typically occurs in patients presenting with neurological symptoms following a confirmed or suspected mumps infection. Supporting documentation should include laboratory confirmation of mumps or clear clinical evidence linking the encephalitis to mumps.

• Ensure documentation clearly links the encephalitis to mumps; otherwise, a non-specific encephalitis code may be more appropriate.
• Code any associated mumps manifestations (e.g., parotitis) separately if documented.
• Do not use this code for encephalitis due to other viral etiologies; specific codes exist for those conditions.