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G04.0

Non-billable

Acute disseminated encephalitis and encephalomyelitis (ADEM)

G04.0 is the ICD-10-CM code for Acute disseminated encephalitis and encephalomyelitis (ADEM). It is a non-billable category code — use a more specific child code such as G04.00 for billing.

Status
Header (non-billable)
Chapter
G00-G99
Parent
G04
Subcodes
3
Edition
FY2026

G00-G99 Diseases of the nervous system

Excludes1 — not coded here

  • •acute necrotizing hemorrhagic encephalopathy (G04.3-)
  • •other noninfectious acute disseminated encephalomyelitis (noninfectious ADEM) (G04.81)

Frequently asked questions

What is ICD-10 code G04.0?
G04.0 is the ICD-10-CM code for "Acute disseminated encephalitis and encephalomyelitis (ADEM)". It falls under G00-G99 Diseases of the nervous system.
Is G04.0 a billable code?
No — G04.0 is a non-billable header code. Use a more specific child code (such as G04.00) for billing.
What are the subcodes of G04.0?
G04.0 has 3 more specific child codes, including G04.00, G04.01, G04.02.
What is excluded from G04.0?
Excludes1 (not coded here): acute necrotizing hemorrhagic encephalopathy (G04.3-); other noninfectious acute disseminated encephalomyelitis (noninfectious ADEM) (G04.81).

Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.

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