2021 ICD-10-CM Diagnosis Code G93.4

Other and unspecified encephalopathy

    2016 2017 2018 2019 2020 2021 Non-Billable/Non-Specific Code
  • G93.4 should not be used for reimbursement purposes as there are multiple codes below it that contain a greater level of detail.
  • The 2021 edition of ICD-10-CM G93.4 became effective on October 1, 2020.
  • This is the American ICD-10-CM version of G93.4 - other international versions of ICD-10 G93.4 may differ.
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 G93.4. 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.
  • alcoholic encephalopathy (
    ICD-10-CM Diagnosis Code G31.2

    Degeneration of nervous system due to alcohol

      2016 2017 2018 2019 2020 2021 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
    )
  • encephalopathy in diseases classified elsewhere (
    ICD-10-CM Diagnosis Code G94

    Other disorders of brain in diseases classified elsewhere

      2016 2017 2018 2019 2020 2021 Billable/Specific Code Manifestation Code
    Code First
    • underlying disease
    Type 1 Excludes
    • encephalopathy in congenital syphilis (A50.49)
    • encephalopathy in influenza (J09.X9, J10.81, J11.81)
    • encephalopathy in syphilis (A52.19)
    • hydrocephalus in diseases classified elsewhere (G91.4)
    G94
    )
  • hypertensive encephalopathy (
    ICD-10-CM Diagnosis Code I67.4

    Hypertensive encephalopathy

      2016 2017 2018 2019 2020 2021 Billable/Specific Code
    Type 2 Excludes
    • insufficiency, NOS, of precerebral arteries (G45.2)
    I67.4
    )
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 (G93.4) and the excluded code together.
  • toxic (metabolic) encephalopathy (
    ICD-10-CM Diagnosis Code G92

    Toxic encephalopathy

      2016 2017 2018 2019 2020 2021 Billable/Specific Code
    Applicable To
    • Toxic encephalitis
    • Toxic metabolic encephalopathy
    Code First
    • , if applicable, drug induced (T36-T50) or use (T51-T65) to identify toxic agent
    G92
    )
The following code(s) above G93.4 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 G93.4:
  • G00-G99
    2021 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
  • A disorder characterized by a pathologic process involving the brain.
  • A disorder of the brain that can be caused by disease, injury, drugs, or chemicals.
  • A functional and/or structural disorder of the brain caused by diseases (e.g. Liver disease, kidney disease), medications, chemicals, and injuries.
  • Degenerative diseases of the brain.
Code History
  • 2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
  • 2017 (effective 10/1/2016): No change
  • 2018 (effective 10/1/2017): No change
  • 2019 (effective 10/1/2018): No change
  • 2020 (effective 10/1/2019): No change
  • 2021 (effective 10/1/2020): No change
ICD-10-CM Codes Adjacent To G93.4
G91.3 Post-traumatic hydrocephalus, unspecified
G91.4 Hydrocephalus in diseases classified elsewhere
G91.8 Other hydrocephalus
G91.9 Hydrocephalus, unspecified
G92 Toxic encephalopathy
G93 Other disorders of brain
G93.0 Cerebral cysts
G93.1 Anoxic brain damage, not elsewhere classified
G93.2 Benign intracranial hypertension
G93.3 Postviral fatigue syndrome
G93.4 Other and unspecified encephalopathy
G93.40 Encephalopathy, unspecified
G93.41 Metabolic encephalopathy
G93.49 Other encephalopathy
G93.5 Compression of brain
G93.6 Cerebral edema
G93.7 Reye's syndrome
G93.8 Other specified disorders of brain
G93.81 Temporal sclerosis
G93.82 Brain death
G93.89 Other specified disorders of brain

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