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2025 ICD-10-CM code A85.1

Adenoviral encephalitis, a rare inflammation of the brain caused by adenovirus.

Use code A85.1 when adenovirus is confirmed as the causative agent of encephalitis.If the specific viral cause is not identified, use code A86 (Unspecified viral encephalitis).

Medical necessity for services related to adenoviral encephalitis is established by the severity of symptoms, the need for diagnostic testing to confirm the diagnosis, and the requirement for treatment and supportive care to manage the condition and prevent complications.

Clinicians diagnose adenoviral encephalitis based on patient history, physical and neurological exams, imaging (CT, EEG, MRI), and cerebrospinal fluid analysis to confirm the presence of the virus. Treatment focuses on managing symptoms, with antiviral medications, corticosteroids, and supportive care as needed.

In simple words: Adenoviral encephalitis is a rare but serious brain infection caused by a common family of viruses.While these viruses usually cause milder illnesses like colds, in rare cases they can cause brain swelling, leading to symptoms like fever, headache, confusion, and seizures.

Adenoviral encephalitis (AE) is characterized by inflammation and/or swelling of the brain due to adenovirus.While adenoviruses commonly cause illnesses like the common cold, pharyngitis, pneumonia, and gastroenteritis, adenoviral encephalitis is rare. It occurs most commonly in infants and individuals with weakened immune systems.

Example 1: A 6-month-old infant presents with fever, lethargy, and irritability.Following diagnostic workup including lumbar puncture, adenoviral encephalitis is confirmed., An immunocompromised adult patient develops headache, confusion, and seizures. Imaging and CSF analysis reveal adenoviral encephalitis., A child with a history of recurrent respiratory infections presents with altered mental status and focal neurological deficits.Adenovirus is identified as the causative agent of encephalitis.

Documentation should include details of the patient's presenting symptoms, history of illness, results of physical and neurological examinations, imaging findings (CT, EEG, MRI), and laboratory results confirming the presence of adenovirus in CSF.

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