2020 ICD-10-CM Diagnosis Code G31.1

Senile degeneration of brain, not elsewhere classified

    2016 2017 2018 2019 2020 Billable/Specific Code
  • G31.1 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
  • The 2020 edition of ICD-10-CM G31.1 became effective on October 1, 2019.
  • This is the American ICD-10-CM version of G31.1 - other international versions of ICD-10 G31.1 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 G31.1. 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.
  • Alzheimer's disease (
    ICD-10-CM Diagnosis Code G30
    • 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
    G30.-
    )
  • senility NOS (
    ICD-10-CM Diagnosis Code R41.81

    Age-related cognitive decline

      2016 2017 2018 2019 2020 Billable/Specific Code Adult Dx (15-124 years)
    Applicable To
    • Senility NOS
    R41.81
    )
The following code(s) above G31.1 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 G31.1:
  • G00-G99
    2020 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
  • G31
    ICD-10-CM Diagnosis Code G31

    Other degenerative diseases of nervous system, not elsewhere classified

      2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
    Type 2 Excludes
    Use Additional
    Other degenerative diseases of nervous system, not elsewhere classified
Approximate Synonyms
  • Age-related degeneration of brain
  • Senile degeneration of brain
ICD-10-CM G31.1 is grouped within Diagnostic Related Group(s) (MS-DRG v37.0):
  • 056 Degenerative nervous system disorders with mcc
  • 057 Degenerative nervous system disorders without mcc

Convert G31.1 to ICD-9-CM

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
Code annotations containing back-references to G31.1:
  • Type 1 Excludes: G30
    ICD-10-CM Diagnosis Code G30

    Alzheimer's disease

      2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
    Includes
    • Alzheimer's dementia senile and presenile forms
    Type 1 Excludes
    • senile degeneration of brain NEC (G31.1)
    • senile dementia NOS (F03)
    • senility NOS (R41.81)
    Use Additional
    • code to identify:
    • delirium, if applicable (F05)
    • dementia with behavioral disturbance (F02.81)
    • dementia without behavioral disturbance (F02.80)

Diagnosis Index entries containing back-references to G31.1:
  • Atrophy, atrophic (of)
    • brain (cortex) (progressive) G31.9
      ICD-10-CM Diagnosis Code G31.9

      Degenerative disease of nervous system, unspecified

        2016 2017 2018 2019 2020 Billable/Specific Code
      • senile NEC G31.1
  • Degeneration, degenerative
    • brain (cortical) (progressive) G31.9
      ICD-10-CM Diagnosis Code G31.9

      Degenerative disease of nervous system, unspecified

        2016 2017 2018 2019 2020 Billable/Specific Code
      • senile NEC G31.1
    • senile R54
      ICD-10-CM Diagnosis Code R54

      Age-related physical debility

        2016 2017 2018 2019 2020 Billable/Specific Code Adult Dx (15-124 years)
      Applicable To
      • Frailty
      • Old age
      • Senescence
      • Senile asthenia
      • Senile debility
      Type 1 Excludes
      • brain G31.1
      • motor centers G31.1
    • motor centers, senile G31.1
  • Disease, diseased - see also Syndrome
    • brain G93.9
      ICD-10-CM Diagnosis Code G93.9

      Disorder of brain, unspecified

        2016 2017 2018 2019 2020 Billable/Specific Code
      • senile NEC G31.1

ICD-10-CM Codes Adjacent To G31.1
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
G31.85 Corticobasal degeneration
G31.89 Other specified degenerative diseases of nervous system
G31.9 Degenerative disease of nervous system, unspecified
G32 Other degenerative disorders of nervous system in diseases classified elsewhere

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