ICD-10-CM Code G23.8

Other specified degenerative diseases of basal ganglia

Version 2021 Billable Code

Valid for Submission

G23.8 is a billable code used to specify a medical diagnosis of other specified degenerative diseases of basal ganglia. The code is valid for the fiscal year 2021 for the submission of HIPAA-covered transactions. The ICD-10-CM code G23.8 might also be used to specify conditions or terms like aicardi goutieres syndrome, autosomal dominant late onset basal ganglia degeneration, basal ganglia degeneration with calcification, calcification of basal ganglia, fahr's syndrome, neuroferritinopathy, etc

Short Description:Other specified degenerative diseases of basal ganglia
Long Description:Other specified degenerative diseases of basal ganglia

Tabular List of Diseases and Injuries

The Tabular List of Diseases and Injuries is a list of ICD-10 codes, organized "head to toe" into chapters and sections with guidance for inclusions, exclusions, descriptions and more. The following references are applicable to the code G23.8:

Inclusion Terms

Inclusion Terms
These terms are the conditions for which that code is to be used. The terms may be synonyms of the code title, or, in the case of "other specified" codes, the terms are a list of the various conditions assigned to that code. The inclusion terms are not necessarily exhaustive. Additional terms found only in the Alphabetic Index may also be assigned to a code.
  • Calcification of basal ganglia

Index to Diseases and Injuries

The Index to Diseases and Injuries is an alphabetical listing of medical terms, with each term mapped to one or more ICD-10 code(s). The following references for the code G23.8 are found in the index:


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

  • Aicardi Goutieres syndrome
  • Autosomal dominant late onset basal ganglia degeneration
  • Basal ganglia degeneration with calcification
  • Calcification of basal ganglia
  • Fahr's syndrome
  • Neuroferritinopathy
  • Olivopontocerebellar atrophy with blindness
  • Olivopontocerebellar atrophy with slow eye movement
  • Olivopontocerebellar degeneration
  • Pallidal degeneration
  • Pallidal degeneration
  • Pallidoluysian degeneration
  • Pallidonigrospinal degeneration
  • Parkinsonism with calcification of basal ganglia
  • Spondyloenchondromatosis
  • Spondyloenchondromatosis with basal ganglia calcification
  • Sporadic olivopontocerebellar atrophy

Convert G23.8 to ICD-9

  • 333.0 - Degen basal ganglia NEC (Approximate Flag)

Code Classification

  • Diseases of the nervous system (G00–G99)
    • Extrapyramidal and movement disorders (G20-G26)
      • Other degenerative diseases of basal ganglia (G23)

Code History

  • FY 2016 - New Code, effective from 10/1/2015 through 9/30/2016
    (First year ICD-10-CM implemented into the HIPAA code set)
  • FY 2017 - No Change, effective from 10/1/2016 through 9/30/2017
  • FY 2018 - No Change, effective from 10/1/2017 through 9/30/2018
  • FY 2019 - No Change, effective from 10/1/2018 through 9/30/2019
  • FY 2020 - No Change, effective from 10/1/2019 through 9/30/2020
  • FY 2021 - No Change, effective from 10/1/2020 through 9/30/2021

Information for Patients

Degenerative Nerve Diseases

Also called: Neurodegenerative diseases

Degenerative nerve diseases affect many of your body's activities, such as balance, movement, talking, breathing, and heart function. Many of these diseases are genetic. Sometimes the cause is a medical condition such as alcoholism, a tumor, or a stroke. Other causes may include toxins, chemicals, and viruses. Sometimes the cause is not known.

Degenerative nerve diseases include

  • Alzheimer's disease
  • Amyotrophic lateral sclerosis
  • Friedreich's ataxia
  • Huntington's disease
  • Lewy body disease
  • Parkinson's disease
  • Spinal muscular atrophy

Degenerative nerve diseases can be serious or life-threatening. It depends on the type. Most of them have no cure. Treatments may help improve symptoms, relieve pain, and increase mobility.

  • Multiple system atrophy (Medical Encyclopedia)
  • Progressive multifocal leukoencephalopathy (Medical Encyclopedia)

[Learn More]