2025
ICD-10-CM
Diagnosis
Code

G04 Encephalitis, myelitis and encephalomyelitis

  • Non-billable
  • 2016–2025

G04 is a non-billable/non-specific diagnosis code from the 2025 ICD-10-CM used to classify the following condition: Encephalitis, myelitis and encephalomyelitis.

Includes

  • Acute ascending myelitis

  • Meningoencephalitis

  • Meningomyelitis

Type 1 excludes

Type 2 excludes

  • Acute transverse myelitis (G37.3)

  • Alcoholic encephalopathy (G31.2)

  • Multiple sclerosis (G35)

  • Myalgic encephalomyelitis (G93.32)

  • Subacute necrotizing myelitis (G37.4)

  • Toxic encephalitis (G92.8)

  • Toxic encephalopathy (G92.8)

Codes

Versions

  1. 2025

    No changes

  2. 2024

    Code changed

    • Type 2 excludes

        • acute transverse myelitis (G37.3-)
        • alcoholic encephalopathy (G31.2)
        • multiple sclerosis (G35)
        • myalgic encephalomyelitis (G93.32)
        • subacute necrotizing myelitis (G37.4)
        • toxic encephalitis (G92.8)
        • toxic encephalopathy (G92.8)
        • acute transverse myelitis (G37.3)
        • alcoholic encephalopathy (G31.2)
        • multiple sclerosis (G35)
        • myalgic encephalomyelitis (G93.32)
        • subacute necrotizing myelitis (G37.4)
        • toxic encephalitis (G92.8)
        • toxic encephalopathy (G92.8)

  3. 2023

    Code changed

    • Type 2 excludes

        • acute transverse myelitis (G37.3-)
        • alcoholic encephalopathy (G31.2)
        • benign myalgic encephalomyelitis (G93.3)
        • multiple sclerosis (G35)
        • subacute necrotizing myelitis (G37.4)
        • toxic encephalitis (G92.8)
        • toxic encephalopathy (G92.8)
        • acute transverse myelitis (G37.3-)
        • alcoholic encephalopathy (G31.2)
        • multiple sclerosis (G35)
        • myalgic encephalomyelitis (G93.32)
        • subacute necrotizing myelitis (G37.4)
        • toxic encephalitis (G92.8)
        • toxic encephalopathy (G92.8)

  4. 2022

    Code changed

    • Type 2 excludes

        • acute transverse myelitis (G37.3-)
        • alcoholic encephalopathy (G31.2)
        • benign myalgic encephalomyelitis (G93.3)
        • multiple sclerosis (G35)
        • subacute necrotizing myelitis (G37.4)
        • toxic encephalitis (G92)
        • toxic encephalopathy (G92)
        • acute transverse myelitis (G37.3-)
        • alcoholic encephalopathy (G31.2)
        • benign myalgic encephalomyelitis (G93.3)
        • multiple sclerosis (G35)
        • subacute necrotizing myelitis (G37.4)
        • toxic encephalitis (G92.8)
        • toxic encephalopathy (G92.8)

  5. 2021

    No changes

  6. 2020

    No changes

  7. 2019

    No changes

  8. 2018

    No changes

  9. 2017

    No changes

  10. 2016

    New code