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ICD-10-CM Current in FY 2027

G04.0

Acute disseminated encephalitis and encephalomyelitis (ADEM)

Release
FY 2027
Effective
Official source (opens in a new tab)

Hierarchy

Where G04.0 sits in the official hierarchy. Each level is the code it is classified under.

  1. G04 Parent Encephalitis, myelitis and encephalomyelitis
  2. G04.0 This code Acute disseminated encephalitis and encephalomyelitis (ADEM)

Official Coding Notes

Reproduced verbatim from the FY 2027 ICD-10-CM files. Notes labelled as inherited are declared on a parent code and apply here too.

Includes

acute ascending myelitis

Inherited from G04 — Encephalitis, myelitis and encephalomyelitis

Includes

meningoencephalitis

Inherited from G04 — Encephalitis, myelitis and encephalomyelitis

Includes

meningomyelitis

Inherited from G04 — Encephalitis, myelitis and encephalomyelitis

Excludes1

acute necrotizing hemorrhagic encephalopathy ( G04.3- )

Excludes1

other noninfectious acute disseminated encephalomyelitis (noninfectious ADEM) ( G04.81 )

Excludes1

encephalopathy NOS ( G93.40 )

Inherited from G04 — Encephalitis, myelitis and encephalomyelitis

Excludes2

acute transverse myelitis ( G37.3 )

Inherited from G04 — Encephalitis, myelitis and encephalomyelitis

Excludes2

alcoholic encephalopathy ( G31.2 )

Inherited from G04 — Encephalitis, myelitis and encephalomyelitis

Excludes2

multiple sclerosis ( G35- )

Inherited from G04 — Encephalitis, myelitis and encephalomyelitis

Excludes2

myalgic encephalomyelitis ( G93.32 )

Inherited from G04 — Encephalitis, myelitis and encephalomyelitis

Excludes2

subacute necrotizing myelitis ( G37.4 )

Inherited from G04 — Encephalitis, myelitis and encephalomyelitis

Excludes2

toxic encephalitis ( G92.8 )

Inherited from G04 — Encephalitis, myelitis and encephalomyelitis

Excludes2

toxic encephalopathy ( G92.8 )

Inherited from G04 — Encephalitis, myelitis and encephalomyelitis

More Specific Codes

3 codes under G04.0

Version History

How G04.0 appears in each release imported from the official files, newest first.

  1. FY 2027 Effective

    Current

    Acute disseminated encephalitis and encephalomyelitis (ADEM)

  2. FY 2026 Effective

    Unchanged

    Acute disseminated encephalitis and encephalomyelitis (ADEM)

Related Codes

Other codes under G04

Codes whose official notes reference G04.0

Data Source

Code information on this page is derived from the FY 2027 ICD-10-CM files published by CDC NCHS and CMS.

Release
FY 2027
Effective
Source file
icd10cm-code-descriptions-2027.zip

Official ICD-10-CM source files (opens in a new tab)

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