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G04.3

⚠ Non-billable (Header)

Acute necrotizing hemorrhagic encephalopathy

Diseases of the nervous system (G00-G99)

⚠️ This is a category header code — not billable. Use a more specific child code below.

Check This Code

❌ Excludes1

direct

These codes are mutually exclusive. Never code them together.

  • • acute disseminated encephalitis and encephalomyelitis (G04.0-)

❌ Excludes1

inherited

Rules inherited from parent codes in the hierarchy.

G04
  • • encephalopathy NOS (G93.40)

⚠️ Excludes2

inherited

Rules inherited from parent codes.

G04
  • • 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)

Child Codes (4)

G04.30Acute necrotizing hemorrhagic encephalopathy, unspecifiedG04.31Postinfectious acute necrotizing hemorrhagic encephalopathyG04.32Postimmunization acute necrotizing hemorrhagic encephalopathyG04.39Other acute necrotizing hemorrhagic encephalopathy

Clinical Description

ICD-10-CM code G04.3 represents acute necrotizing hemorrhagic encephalopathy. This code falls under the Diseases of the nervous system (G00-G99) classification. It is a non-billable category header code. A more specific child code from the list below must be used for billing and reimbursement purposes.

This is a 5-character code at the 4th level of specificity. There are 4 more specific child codes under G04.3. Coders should note that G04.3 has 2 Excludes1 restriction(s) — codes that cannot be reported together on the same claim.

Frequently Asked Questions

What is ICD-10 code G04.3?

ICD-10-CM code G04.3 is "Acute necrotizing hemorrhagic encephalopathy". It belongs to the category: Diseases of the nervous system (G00-G99).

Is G04.3 a billable ICD-10 code?

No, G04.3 is a non-billable header code. A more specific child code must be used for billing.

What codes are excluded with G04.3?

G04.3 has 2 Excludes1 rule(s). These codes are mutually exclusive and cannot be coded together on the same claim.

Can G04.3 be coded with other codes?

G04.3 has 7 Excludes2 note(s). These conditions can be coded together if both are documented in the patient record.

Related Codes in G04

Other codes in the same category that may be relevant for differential coding:

G04.0Acute disseminated encephalitis and encephalomyelitis (ADEM)G04.1Tropical spastic paraplegiaG04.2Bacterial meningoencephalitis and meningomyelitis, not elsewhere classifiedG04.8Other encephalitis, myelitis and encephalomyelitisG04.9Encephalitis, myelitis and encephalomyelitis, unspecified

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Code Information

CodeG04.3
BillableNo — Header code
ParentG04
CategoryDiseases of the nervous system (G00-G99)
Excludes12 rule(s)
Excludes27 note(s)
Child codes4

Data Source

CMS ICD-10-CM 2026 Tabular List

Updated October 1, 2025 (FY2026)