2017/18 ICD-10-CM Diagnosis Code G31

Other degenerative diseases of nervous system, not elsewhere classified

Use Additional
Use Additional Help
Certain conditions have both an underlying etiology and multiple body system manifestations due to the underlying etiology. For such conditions the ICD-10-CM has a coding convention that requires the underlying condition be sequenced first followed by the manifestation. Wherever such a combination exists there is a "use additional code" note at the etiology code, and a "code first" note at the manifestation code. These instructional notes indicate the proper sequencing order of the codes, etiology followed by manifestation. In most cases the manifestation codes will have in the code title, "in diseases classified elsewhere." Codes with this title are a component of the etiology/manifestation convention. The code title indicates that it is a manifestation code. "In diseases classified elsewhere" codes are never permitted to be used as first listed or principle diagnosis codes. They must be used in conjunction with an underlying condition code and they must be listed following the underlying condition.
  • code to identify:
  • dementia with behavioral disturbance (
    ICD-10-CM Diagnosis Code F02.81

    Dementia in other diseases classified elsewhere with behavioral disturbance

      2016 2017 2018 Billable/Specific Code Manifestation Code
    Applicable To
    • Dementia in other diseases classified elsewhere with aggressive behavior
    • Dementia in other diseases classified elsewhere with combative behavior
    • Dementia in other diseases classified elsewhere with violent behavior
    • Major neurocognitive disorder in other diseases classified elsewhere with aggressive behavior
    • Major neurocognitive disorder in other diseases classified elsewhere with combative behavior
    • Major neurocognitive disorder in other diseases classified elsewhere with violent behavior
    Use Additional
    • code, if applicable, to identify wandering in dementia in conditions classified elsewhere (Z91.83)
    F02.81
    )
  • dementia without behavioral disturbance (
    ICD-10-CM Diagnosis Code F02.80

    Dementia in other diseases classified elsewhere without behavioral disturbance

      2016 2017 2018 Billable/Specific Code Manifestation Code
    Applicable To
    • Dementia in other diseases classified elsewhere NOS
    • Major neurocognitive disorder in other diseases classified elsewhere
    F02.80
    )
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 (G31) and the excluded code together.
  • Reye's syndrome (
    ICD-10-CM Diagnosis Code G93.7

    Reye's syndrome

      2016 2017 2018 Billable/Specific Code Pediatric Dx (0-17 years)
    Code First
    • poisoning due to salicylates, if applicable (T39.0-, with sixth character 1-4)
    Use Additional
    • code for adverse effect due to salicylates, if applicable (T39.0-, with sixth character 5)
    G93.7
    )
The following code(s) above G31 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 G31:
  • 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
Code History
ICD-10-CM Codes Adjacent To G31
G25.82 Stiff-man syndrome
G25.83 Benign shuddering attacks
G25.89 Other specified extrapyramidal and movement disorders
G25.9 Extrapyramidal and movement disorder, unspecified
G26 Extrapyramidal and movement disorders in diseases classified elsewhere
G30 Alzheimer's disease
G30.0 Alzheimer's disease with early onset
G30.1 Alzheimer's disease with late onset
G30.8 Other Alzheimer's disease
G30.9 Alzheimer's disease, unspecified
G31 Other degenerative diseases of nervous system, not elsewhere classified
G31.0 Frontotemporal dementia
G31.01 Pick's disease
G31.09 Other frontotemporal dementia
G31.1 Senile degeneration of brain, not elsewhere classified
G31.2 Degeneration of nervous system due to alcohol
G31.8 Other specified degenerative diseases of nervous system
G31.81 Alpers disease
G31.82 Leigh's disease
G31.83 Dementia with Lewy bodies
G31.84 Mild cognitive impairment, so stated

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