2017/18 ICD-10-CM Diagnosis Code G04

Encephalitis, myelitis and encephalomyelitis

Type 1 Excludes
Type 1 Excludes Help
A type 1 excludes note is a pure excludes. It means "not coded here". A type 1 excludes note indicates that the code excluded should never be used at the same time as G04. A type 1 excludes note is for used for when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
  • encephalopathy NOS (
    ICD-10-CM Diagnosis Code G93.40

    Encephalopathy, unspecified

      2016 2017 2018 Billable/Specific Code
    G93.40
    )
Type 2 Excludes
Type 2 Excludes Help
A type 2 excludes note represents "not included here". A type 2 excludes note indicates that the condition excluded is not part of the condition it is excluded from but a patient may have both conditions at the same time. When a type 2 excludes note appears under a code it is acceptable to use both the code (G04) and the excluded code together.
  • acute transverse myelitis (
    ICD-10-CM Diagnosis Code G37.3

    Acute transverse myelitis in demyelinating disease of central nervous system

      2016 2017 2018 Billable/Specific Code
    Applicable To
    • Acute transverse myelitis NOS
    • Acute transverse myelopathy
    Type 1 Excludes
    • multiple sclerosis (G35)
    • neuromyelitis optica [Devic] (G36.0)
    G37.3-
    )
  • alcoholic encephalopathy (
    ICD-10-CM Diagnosis Code G31.2

    Degeneration of nervous system due to alcohol

      2016 2017 2018 Billable/Specific Code
    Applicable To
    • Alcoholic cerebellar ataxia
    • Alcoholic cerebellar degeneration
    • Alcoholic cerebral degeneration
    • Alcoholic encephalopathy
    • Dysfunction of the autonomic nervous system due to alcohol
    Code Also
    • associated alcoholism (F10.-)
    G31.2
    )
  • benign myalgic encephalomyelitis (
    ICD-10-CM Diagnosis Code G93.3

    Postviral fatigue syndrome

      2016 2017 2018 Billable/Specific Code
    Applicable To
    • Benign myalgic encephalomyelitis
    Type 1 Excludes
    • chronic fatigue syndrome NOS (R53.82)
    G93.3
    )
  • multiple sclerosis (
    ICD-10-CM Diagnosis Code G35

    Multiple sclerosis

      2016 2017 2018 Billable/Specific Code
    Applicable To
    • Disseminated multiple sclerosis
    • Generalized multiple sclerosis
    • Multiple sclerosis NOS
    • Multiple sclerosis of brain stem
    • Multiple sclerosis of cord
    G35
    )
  • subacute necrotizing myelitis (
    ICD-10-CM Diagnosis Code G37.4

    Subacute necrotizing myelitis of central nervous system

      2016 2017 2018 Billable/Specific Code
    G37.4
    )
  • toxic encephalitis (
    ICD-10-CM Diagnosis Code G92

    Toxic encephalopathy

      2016 2017 2018 Billable/Specific Code
    Applicable To
    • Toxic encephalitis
    • Toxic metabolic encephalopathy
    Code First
    • , if applicable, drug induced (T36-T50)
    • (T51-T65) to identify toxic agent
    G92
    )
  • toxic encephalopathy (
    ICD-10-CM Diagnosis Code G92

    Toxic encephalopathy

      2016 2017 2018 Billable/Specific Code
    Applicable To
    • Toxic encephalitis
    • Toxic metabolic encephalopathy
    Code First
    • , if applicable, drug induced (T36-T50)
    • (T51-T65) to identify toxic agent
    G92
    )
Includes
Includes Help
"Includes" further defines, or give examples of, the content of the code or category.
  • acute ascending myelitis
  • meningoencephalitis
  • meningomyelitis
The following code(s) above G04 contain annotation back-references
Annotation Back-References
In this context, annotation back-references refer to codes that contain:
  • Applicable To annotations, or
  • Code Also annotations, or
  • Code First annotations, or
  • Excludes1 annotations, or
  • Excludes2 annotations, or
  • Includes annotations, or
  • Note annotations, or
  • Use Additional annotations
that may be applicable to G04:
  • G00-G99
    2018 ICD-10-CM Range G00-G99

    Diseases of the nervous system

    Type 2 Excludes
    • certain conditions originating in the perinatal period (P04-P96)
    • certain infectious and parasitic diseases (A00-B99)
    • complications of pregnancy, childbirth and the puerperium (O00-O9A)
    • congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
    • endocrine, nutritional and metabolic diseases (E00-E88)
    • injury, poisoning and certain other consequences of external causes (S00-T88)
    • neoplasms (C00-D49)
    • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
    Diseases of the nervous system
Clinical Information Code History
Code annotations containing back-references to G04:
ICD-10-CM Codes Adjacent To G04
G00.8 Other bacterial meningitis
G00.9 Bacterial meningitis, unspecified
G01 Meningitis in bacterial diseases classified elsewhere
G02 Meningitis in other infectious and parasitic diseases classified elsewhere
G03 Meningitis due to other and unspecified causes
G03.0 Nonpyogenic meningitis
G03.1 Chronic meningitis
G03.2 Benign recurrent meningitis [Mollaret]
G03.8 Meningitis due to other specified causes
G03.9 Meningitis, unspecified
G04 Encephalitis, myelitis and encephalomyelitis
G04.0 Acute disseminated encephalitis and encephalomyelitis (ADEM)
G04.00 Acute disseminated encephalitis and encephalomyelitis, unspecified
G04.01 Postinfectious acute disseminated encephalitis and encephalomyelitis (postinfectious ADEM)
G04.02 Postimmunization acute disseminated encephalitis, myelitis and encephalomyelitis
G04.1 Tropical spastic paraplegia
G04.2 Bacterial meningoencephalitis and meningomyelitis, not elsewhere classified
G04.3 Acute necrotizing hemorrhagic encephalopathy
G04.30 …… unspecified
G04.31 Postinfectious acute necrotizing hemorrhagic encephalopathy
G04.32 Postimmunization acute necrotizing hemorrhagic encephalopathy

Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.