G04.0 (Acute disseminated encephalitis and encephalomyelitis (ADEM)) is an umbrella ICD-10-CM medical diagnosis code in the Diseases of the nervous system chapter. It identifies cases of acute disseminated encephalitis and encephalomyelitis (adem) for clinical documentation, billing and epidemiological tracking.

ICD-10-CM · Category

G04.0 — Acute disseminated encephalitis and encephalomyelitis (ADEM)

Chapter G00-G99: Diseases of the nervous system

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Sub-codes under G04.0

G04.00Acute disseminated encephalitis and encephalomyelitis, unspG04.01Postinfect acute dissem encephalitis and encephalomyelitisG04.02Postimmun ac dissem encphlts, myelitis and encephalomyelitis

Related diagnoses

G04.1Tropical spastic paraplegiaG04.2Bacterial meningoencephalitis and meningomyelitis, NECG04.3Acute necrotizing hemorrhagic encephalopathyG04.8Other encephalitis, myelitis and encephalomyelitisG04.9Encephalitis, myelitis and encephalomyelitis, unspecified

Common questions about G04.0 (Acute disseminated encephalitis and encephalomyelitis (ADEM))

What does ICD-10 code G04.0 mean?
G04.0 is the ICD-10-CM 2025 code for Acute disseminated encephalitis and encephalomyelitis (ADEM). ICD-10-CM is the medical coding system used by clinicians, hospitals and insurers worldwide to classify diseases and conditions in a standard way.
Is G04.0 a billable diagnosis code?
G04.0 is a category-level (umbrella) code rather than a billable specific code. For billing purposes, clinicians typically use a more specific sub-code under G04.0. Browse the sub-codes listed on this page.
Which ICD-10 chapter does G04.0 belong to?
G04.0 belongs to the chapter "Diseases of the nervous system" (codes G00-G99). ICD-10-CM organises codes into 22 chapters by body system or condition type, which helps clinicians navigate related diagnoses.
Where can I get plain-language information about Acute disseminated encephalitis and encephalomyelitis (ADEM)?
For a plain-language explanation of Acute disseminated encephalitis and encephalomyelitis (ADEM), ask GoDavaii's Health AI - it explains medical conditions in 90+ languages, free, with no signup. Tap "Ask GoDavaii AI about Acute disseminated encephalitis and encephalomyelitis (ADEM)" above to get a personalised answer.

Source: ICD-10-CM 2025 (Centers for Medicare & Medicaid Services, public domain). Codes valid from October 1, 2024. CMS source ↗