2021 ICD-10-CM Diagnosis Code G23

Other degenerative diseases of basal ganglia

    2016 2017 2018 2019 2020 2021 Non-Billable/Non-Specific Code
  • G23 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 G23 became effective on October 1, 2020.
  • This is the American ICD-10-CM version of G23 - other international versions of ICD-10 G23 may differ.
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 (G23) and the excluded code together.
  • multi-system degeneration of the autonomic nervous system (
    ICD-10-CM Diagnosis Code G90.3

    Multi-system degeneration of the autonomic nervous system

      2016 2017 2018 2019 2020 2021 Billable/Specific Code
    Applicable To
    • Neurogenic orthostatic hypotension [Shy-Drager]
    Type 1 Excludes
    • orthostatic hypotension NOS (I95.1)
    G90.3
    )
The following code(s) above G23 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 G23:
  • 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
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 G23
G21 Secondary parkinsonism
G21.0 Malignant neuroleptic syndrome
G21.1 Other drug-induced secondary parkinsonism
G21.11 Neuroleptic induced parkinsonism
G21.19 Other drug induced secondary parkinsonism
G21.2 Secondary parkinsonism due to other external agents
G21.3 Postencephalitic parkinsonism
G21.4 Vascular parkinsonism
G21.8 Other secondary parkinsonism
G21.9 Secondary parkinsonism, unspecified
G23 Other degenerative diseases of basal ganglia
G23.0 Hallervorden-Spatz disease
G23.1 Progressive supranuclear ophthalmoplegia [Steele-Richardson-Olszewski]
G23.2 Striatonigral degeneration
G23.8 Other specified degenerative diseases of basal ganglia
G23.9 Degenerative disease of basal ganglia, unspecified
G24 Dystonia
G24.0 Drug induced dystonia
G24.01 Drug induced subacute dyskinesia
G24.02 Drug induced acute dystonia
G24.09 Other drug induced dystonia

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