Non-Billable / Non-Specific Code
ICD-10-CM G04 is the diagnosis code for Encephalitis, myelitis and encephalomyelitis. This code falls under the section "Inflammatory diseases of the central nervous system" within Chapter 6 â 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. They are mutually exclusive:
The following conditions are not included in G04. If the patient has both, code each condition separately:
Understanding where G04 sits in the ICD-10-CM classification helps ensure proper coding:
No, G04 is a non-billable/non-specific code. You should use a more specific sub-code for billing and reimbursement.
G04 is the ICD-10-CM diagnosis code for "Encephalitis, myelitis and encephalomyelitis". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
G04 is located in Section G00-G09 â "Inflammatory diseases of the central nervous system" within Chapter 6 of the ICD-10-CM Tabular List.
G04 has 6 sub-code(s) that provide more specific detail: G04.0, G04.1, G04.2, G04.3, G04.8 and more.
Use G04 when the patients documented diagnosis matches "Encephalitis, myelitis and encephalomyelitis" 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 Encephalitis, myelitis and encephalomyelitis is G04.
No, G04 is non-billable. Use a more specific sub-code for primary diagnosis billing.
G04 is in Chapter 6 of the ICD-10-CM Tabular List.
Type 1 Excludes for G04 include: encephalopathy NOS (G93.40).
Yes, G04 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.