2020 ICD-10-CM Diagnosis Code G23.2

Striatonigral degeneration

    2016 2017 2018 2019 2020 Billable/Specific Code
  • G23.2 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 G23.2 became effective on October 1, 2019.
  • This is the American ICD-10-CM version of G23.2 - other international versions of ICD-10 G23.2 may differ.
The following code(s) above G23.2 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 G23.2:
  • 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
Clinical Information
  • A sporadic neurodegenerative disease with onset in middle-age characterized clinically by parkinsonian features (e.g., muscle rigidity; hypokinesia; stooped posture) and hypotension. This condition is considered a clinical variant of multiple system atrophy. Pathologic features include a prominent loss of neurons in the zona compacta of the substantia nigra and putamen. (from Adams et al., Principles of Neurology, 6th ed, p1075-6)
ICD-10-CM G23.2 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 G23.2 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 G23.2:

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

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