2020 ICD-10-CM Diagnosis Code G23.8

Other specified degenerative diseases of basal ganglia

    2016 2017 2018 2019 2020 Billable/Specific Code
  • G23.8 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 G23.8 became effective on October 1, 2019.
  • This is the American ICD-10-CM version of G23.8 - other international versions of ICD-10 G23.8 may differ.
Applicable To
  • Calcification of basal ganglia
The following code(s) above G23.8 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 G23.8:
  • 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
  • G23
    ICD-10-CM Diagnosis Code G23

    Other degenerative diseases of basal ganglia

      2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
    Type 2 Excludes
    • multi-system degeneration of the autonomic nervous system (G90.3)
    Other degenerative diseases of basal ganglia
Approximate Synonyms
  • Olivopontocerebellar atrophy
  • Olivopontocerebellar degeneration
ICD-10-CM G23.8 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 G23.8 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

Diagnosis Index entries containing back-references to G23.8:
  • Atrophy, atrophic (of)
    • Déjérine-Thomas G23.8
    • olivopontocerebellar G23.8
  • Calcification
    • basal ganglia G23.8
  • Degeneration, degenerative
    • basal nuclei or ganglia G23.9
      ICD-10-CM Diagnosis Code G23.9

      Degenerative disease of basal ganglia, unspecified

        2016 2017 2018 2019 2020 Billable/Specific Code
      • specified NEC G23.8
    • olivopontocerebellar G23.8 (hereditary) (familial)
  • Déjérine-Thomas atrophy G23.8
  • Disease, diseased - see also Syndrome
    • basal ganglia G25.9
      ICD-10-CM Diagnosis Code G25.9

      Extrapyramidal and movement disorder, unspecified

        2016 2017 2018 2019 2020 Billable/Specific Code
      • degenerative G23.9
        ICD-10-CM Diagnosis Code G23.9

        Degenerative disease of basal ganglia, unspecified

          2016 2017 2018 2019 2020 Billable/Specific Code
        • specified NEC G23.8
    • Fahr G23.8 (of brain)
  • Fahr disease G23.8 (of brain)

ICD-10-CM Codes Adjacent To G23.8
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
G24.1 Genetic torsion dystonia
G24.2 Idiopathic nonfamilial dystonia
G24.3 Spasmodic torticollis
G24.4 Idiopathic orofacial dystonia

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