G04.0
Non-billableAcute disseminated encephalitis and encephalomyelitis (ADEM)
Acute disseminated encephalitis and encephalomyelitis (ADEM)
This is a header/category code. For billing purposes, use a more specific child code from the list below.
Coding Notes
Includes
Conditions included under this code
- acute ascending myelitis
- meningoencephalitis
- meningomyelitis
Excludes 1
Codes that cannot be used together with this code (mutual exclusion)
Excludes 2
Conditions not included here, but the patient may have both
- •certain conditions originating in the perinatal periodP04-P96
- •certain infectious and parasitic diseasesA00-B99
- •complications of pregnancy, childbirth and the puerperiumO9A)O00
- •congenital malformations, deformations, and chromosomal abnormalitiesQ00-Q99
- •endocrine, nutritional and metabolic diseasesE00-E88
- •injury, poisoning and certain other consequences of external causesS00-T88
- •neoplasmsC00-D49
- •symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classifiedR00-R94
- •acute transverse myelitisG37.3
- •alcoholic encephalopathyG31.2
- •multiple sclerosisG35
- •myalgic encephalomyelitisG93.32
- •subacute necrotizing myelitisG37.4
- •toxic encephalitisG92.8
- •toxic encephalopathyG92.8
Child Codes (3)
Related Codes(5)
ICD-11 Equivalents(1)
ICD-11 Equivalents
View full mappingCorresponding ICD-11 codes from the WHO crosswalk mapping
Also Known As / Clinical Terms(1)
Frequently Asked Questions
What is the ICD-10 code for acute disseminated encephalitis and encephalomyelitis (adem)?
The ICD-10-CM code for acute disseminated encephalitis and encephalomyelitis (adem) is G04.0. The full clinical description is "Acute disseminated encephalitis and encephalomyelitis (ADEM)". G04.0 is a non-billable header code. Use a more specific child code for billing purposes.
What does ICD-10 code G04.0 mean?
ICD-10-CM code G04.0 represents “Acute disseminated encephalitis and encephalomyelitis (ADEM)”. It is classified under Chapter 6: Diseases of the Nervous System and is a non-billable header code. Use a more specific child code for billing purposes.
Is G04.0 a billable code?
No, G04.0 is a non-billable header code. You need to use one of its more specific child codes for billing. There are 3 child codes under G04.0.
What chapter is G04.0 in?
G04.0 is in Chapter 6: Diseases of the Nervous System (codes G00-G99).
What codes cannot be used with G04.0?
G04.0 has Excludes1 notes indicating codes that cannot be used together with it, including: encephalopathy NOS (G93.40); acute necrotizing hemorrhagic encephalopathy (G04.3-); other noninfectious acute disseminated encephalomyelitis (noninfectious ADEM) (G04.81).
What are the subcategories under G04.0?
G04.0 has 3 child codes, including: G04.00 (Acute disseminated encephalitis and encephalomyelitis, unsp), G04.01 (Postinfect acute dissem encephalitis and encephalomyelitis), G04.02 (Postimmun ac dissem encphlts, myelitis and encephalomyelitis).
What are the UMLS CUIs for G04.0?
G04.0 is linked to 1 UMLS Concept Unique Identifier: C2875014. The UMLS (Unified Medical Language System) integrates multiple biomedical vocabularies maintained by the U.S. National Library of Medicine.
How does G04.0 relate to ICF functioning codes?
ICF (International Classification of Functioning, Disability and Health) codes describe how conditions like acute disseminated encephalitis and encephalomyelitis (adem) affect a person's functioning — body functions, activities, participation, and environmental factors. AutoICD provides ICF Core Sets for 12+ conditions and can map clinical text to ICF categories automatically. Browse the ICF directory to explore functioning codes.
What is the ICD-11 equivalent of G04.0?
G04.0 maps to the ICD-11 code: 8A42.Z (Acute disseminated encephalomyelitis, unspecified).
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Includes SNOMED Clinical Terms® (SNOMED CT®) used by permission of SNOMED International. Includes content from the UMLS Metathesaurus, courtesy of the U.S. National Library of Medicine.