Billable / Specific Code
ICD-10-CM G04.01 is the diagnosis code for Postinfectious acute disseminated encephalitis and encephalomyelitis (postinfectious 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 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.
The following conditions should never be coded at the same time as G04.01. They are mutually exclusive:
Understanding where G04.01 sits in the ICD-10-CM classification helps ensure proper coding:
Yes, G04.01 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
G04.01 is the ICD-10-CM diagnosis code for "Postinfectious acute disseminated encephalitis and encephalomyelitis (postinfectious ADEM)". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
The parent code of G04.01 is G04.0 ("Acute disseminated encephalitis and encephalomyelitis (ADEM)"). G04.01 provides a more specific classification within this category.
G04.01 is located in Section G00-G09 — "Inflammatory diseases of the central nervous system" within Chapter 6 of the ICD-10-CM Tabular List.
Use G04.01 when the patients documented diagnosis matches "Postinfectious acute disseminated encephalitis and encephalomyelitis (postinfectious 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 Postinfectious acute disseminated encephalitis and encephalomyelitis (postinfectious ADEM) is G04.01.
Yes, G04.01 can be used as a primary diagnosis code since it is billable and specific.
G04.01 is in Chapter 6 of the ICD-10-CM Tabular List.
Type 1 Excludes for G04.01 include: post chickenpox encephalitis (B01.1); post measles encephalitis (B05.0); post measles myelitis (B05.1).
Yes, G04.01 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.