ICD-10 Code G04.8 – Other encephalitis, myelitis and encephalomyelitis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G04.8 – Other encephalitis, myelitis and encephalomyelitis
What it is
G04.8 identifies inflammatory disease of the brain, spinal cord, or both when the condition does not fit a more specific encephalitis, myelitis, or encephalomyelitis code. Use it for documented “other” inflammatory CNS disorders.
Clinical signs
Clinical features vary; refer to documentation. Findings may include neurologic deficits, altered mental status, weakness, sensory changes, or signs of combined brain and spinal cord involvement.
When to use this code
Use G04.8 when the provider documents an inflammatory encephalitis, myelitis, or encephalomyelitis that is not otherwise classified. It also fits cases labeled “other” or when the record specifies a distinct inflammatory CNS process without a more precise code. Check documentation if the diagnosis is uncertain.
Do not use for
Do not use this code for infectious meningitis, demyelinating disease, or traumatic spinal cord disorders. If the condition is better described by a more specific encephalitis or myelitis code, use that code instead.
Coding tip
Code only when the provider clearly documents an inflammatory CNS diagnosis and no more specific ICD-10-CM option applies.