Non-Billable / Non-Specific Code
ICD-10-CM G04.0 is the diagnosis code for Acute disseminated encephalitis and encephalomyelitis (ADEM). This code falls under the section "Inflammatory diseases of the central nervous system" within Chapter 6 — Diseases of the nervous system (G00-G99). It is a non-billable/non-specific ICD-10-CM code that should not be used for reimbursement. A more specific sub-code is required for billing. Medical coders and healthcare providers use this code to document and classify diagnoses in electronic health records, insurance claims, and clinical databases.
The following conditions should never be coded at the same time as G04.0. They are mutually exclusive:
Understanding where G04.0 sits in the ICD-10-CM classification helps ensure proper coding:
No, G04.0 is a non-billable/non-specific code. You should use a more specific sub-code for billing and reimbursement.
G04.0 is the ICD-10-CM diagnosis code for "Acute disseminated encephalitis and encephalomyelitis (ADEM)". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
The parent code of G04.0 is G04 ("Encephalitis, myelitis and encephalomyelitis"). G04.0 provides a more specific classification within this category.
G04.0 is located in Section G00-G09 — "Inflammatory diseases of the central nervous system" within Chapter 6 of the ICD-10-CM Tabular List.
G04.0 has 3 sub-code(s) that provide more specific detail: G04.00, G04.01, G04.02.
Use G04.0 when the patients documented diagnosis matches "Acute disseminated encephalitis and encephalomyelitis (ADEM)" and the clinical documentation supports this level of specificity. Always verify with the latest ICD-10-CM guidelines and payer requirements.
The ICD-10-CM code for Acute disseminated encephalitis and encephalomyelitis (ADEM) is G04.0.
No, G04.0 is non-billable. Use a more specific sub-code for primary diagnosis billing.
G04.0 is in Chapter 6 of the ICD-10-CM Tabular List.
Type 1 Excludes for G04.0 include: acute necrotizing hemorrhagic encephalopathy (G04.3-); other noninfectious acute disseminated encephalomyelitis (noninfectious ADEM) (G04.81).
Yes, G04.0 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.