Postinfect acute dissem encephalitis and encephalomyelitis

This code identifies an inflammatory demyelinating disorder of the brain and spinal cord that occurs following an infection. It is characterized by widespread inflammation and damage to the myelin sheath, often presenting with acute neurological symptoms such as encephalopathy, seizures, or focal neurological deficits.

Assign this code for cases of acute disseminated encephalomyelitis (ADEM) that develop as a sequela to a non-specific or unspecified infection. Documentation should clearly state "postinfectious ADEM" or "acute disseminated encephalomyelitis following infection" and rule out other specific post-viral encephalitides.

• Ensure the documentation specifies "postinfectious" ADEM to differentiate from other forms.
• Review the "Excludes1" notes carefully to avoid co-coding with specific post-viral encephalitides like post-chickenpox or post-measles encephalitis.
• Code any underlying or causative infection separately if documented and still active.