Billable / Specific Code
ICD-10-CM G04.90 is the diagnosis code for Encephalitis and encephalomyelitis, unspecified. 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 billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes. Medical coders and healthcare providers use this code to document and classify diagnoses in electronic health records, insurance claims, and clinical databases.
Understanding where G04.90 sits in the ICD-10-CM classification helps ensure proper coding:
Yes, G04.90 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
G04.90 is the ICD-10-CM diagnosis code for "Encephalitis and encephalomyelitis, unspecified". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
The parent code of G04.90 is G04.9 ("Encephalitis, myelitis and encephalomyelitis, unspecified"). G04.90 provides a more specific classification within this category.
G04.90 is located in Section G00-G09 — "Inflammatory diseases of the central nervous system" within Chapter 6 of the ICD-10-CM Tabular List.
Use G04.90 when the patients documented diagnosis matches "Encephalitis and encephalomyelitis, unspecified" 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 and encephalomyelitis, unspecified is G04.90.
Yes, G04.90 can be used as a primary diagnosis code since it is billable and specific.
G04.90 is in Chapter 6 of the ICD-10-CM Tabular List.
Yes, G04.90 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.