2024 ICD-10-CM Diagnosis Code G23.2

Striatonigral degeneration

ICD-10-CM Code:
ICD-10 Code for:
Striatonigral degeneration
Is Billable?
Yes - Valid for Submission
Chronic Condition Indicator: [1]
Code Navigator:

Code Classification

  • Diseases of the nervous system
    • Extrapyramidal and movement disorders
      • Other degenerative diseases of basal ganglia

G23.2 is a billable diagnosis code used to specify a medical diagnosis of striatonigral degeneration. The code is valid during the current fiscal year for the submission of HIPAA-covered transactions from October 01, 2023 through September 30, 2024.

Approximate Synonyms

The following clinical terms are approximate synonyms or lay terms that might be used to identify the correct diagnosis code:

  • Familial infantile bilateral striatal necrosis
  • Infantile striatonigral degeneration
  • Sporadic infantile bilateral striatal necrosis
  • Striatonigral degeneration

Clinical Classification

Clinical Information

  • Machado-Joseph Disease

    a dominantly-inherited ataxia first described in people of azorean and portuguese descent, and subsequently identified in brazil, japan, china, and australia. this disorder is classified as one of the spinocerebellar ataxias (type 3) and has been associated with a mutation of the mjd1 gene on chromosome 14. clinical features include progressive ataxia, dysarthria, postural instability, nystagmus, eyelid retraction, and facial fasciculations. dystonia is prominent in younger patients (referred to as type i machado-joseph disease). type ii features ataxia and ocular signs; type iii features muscular atrophy and a sensorimotor neuropathy; and type iv features extrapyramidal signs combined with a sensorimotor neuropathy. (from clin neurosci 1995;3(1):17-22; ann neurol 1998 mar;43(3):288-96)
  • Striatonigral Degeneration

    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)

Index to Diseases and Injuries References

The following annotation back-references for this diagnosis code are found in the injuries and diseases index. The Index to Diseases and Injuries is an alphabetical listing of medical terms, with each term mapped to one or more ICD-10-CM code(s).

Convert G23.2 to ICD-9-CM

  • ICD-9-CM Code: 333.0 - Degen basal ganglia NEC
    Approximate Flag - The approximate mapping means there is not an exact match between the ICD-10 and ICD-9 codes and the mapped code is not a precise representation of the original code.

Code History

  • FY 2024 - No Change, effective from 10/1/2023 through 9/30/2024
  • FY 2023 - No Change, effective from 10/1/2022 through 9/30/2023
  • FY 2022 - No Change, effective from 10/1/2021 through 9/30/2022
  • FY 2021 - No Change, effective from 10/1/2020 through 9/30/2021
  • FY 2020 - No Change, effective from 10/1/2019 through 9/30/2020
  • FY 2019 - No Change, effective from 10/1/2018 through 9/30/2019
  • FY 2018 - No Change, effective from 10/1/2017 through 9/30/2018
  • FY 2017 - No Change, effective from 10/1/2016 through 9/30/2017
  • FY 2016 - New Code, effective from 10/1/2015 through 9/30/2016. This was the first year ICD-10-CM was implemented into the HIPAA code set.


[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:

  • The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
  • The condition places limitations on self-care, independent living, and social interactions.