2022 ICD-10-CM Code G31

Other degenerative diseases of nervous system, not elsewhere classified

Version 2021

Not Valid for Submission

ICD-10:G31
Short Description:Oth degenerative diseases of nervous system, NEC
Long Description:Other degenerative diseases of nervous system, not elsewhere classified

Code Classification

  • Diseases of the nervous system (G00–G99)
    • Other degenerative diseases of the nervous system (G30-G32)
      • Oth degenerative diseases of nervous system, NEC (G31)

G31 is a non-specific and non-billable diagnosis code code, consider using a code with a higher level of specificity for a diagnosis of other degenerative diseases of nervous system, not elsewhere classified. The code is not specific and is NOT valid for the year 2022 for the submission of HIPAA-covered transactions. Category or Header define the heading of a category of codes that may be further subdivided by the use of 4th, 5th, 6th or 7th characters.

Specific Coding for Oth degenerative diseases of nervous system, NEC

Non-specific codes like G31 require more digits to indicate the appropriate level of specificity. Consider using any of the following ICD-10 codes with a higher level of specificity when coding for oth degenerative diseases of nervous system, nec:

  • NON-BILLABLE CODE - G31.0 for Frontotemporal dementia
  • BILLABLE CODE - Use G31.01 for Pick's disease
  • BILLABLE CODE - Use G31.09 for Other frontotemporal dementia
  • BILLABLE CODE - Use G31.1 for Senile degeneration of brain, not elsewhere classified
  • BILLABLE CODE - Use G31.2 for Degeneration of nervous system due to alcohol
  • NON-BILLABLE CODE - G31.8 for Other specified degenerative diseases of nervous system
  • BILLABLE CODE - Use G31.81 for Alpers disease
  • BILLABLE CODE - Use G31.82 for Leigh's disease
  • BILLABLE CODE - Use G31.83 for Dementia with Lewy bodies
  • BILLABLE CODE - Use G31.84 for Mild cognitive impairment, so stated
  • BILLABLE CODE - Use G31.85 for Corticobasal degeneration
  • BILLABLE CODE - Use G31.89 for Other specified degenerative diseases of nervous system
  • BILLABLE CODE - Use G31.9 for Degenerative disease of nervous system, unspecified

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 coding notes and guidance for inclusions, exclusions, descriptions and more. The following references are applicable to the code G31:


Use Additional Code

Use Additional Code
The “use additional code” indicates that a secondary code could be used to further specify the patient’s condition. This note is not mandatory and is only used if enough information is available to assign an additional code.

Type 2 Excludes

Type 2 Excludes
A type 2 excludes note represents "Not included here". An excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time. When an Excludes2 note appears under a code, it is acceptable to use both the code and the excluded code together, when appropriate.

Information for Patients


Degenerative Nerve 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 unknown.

Degenerative nerve diseases include

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.


[Learn More in MedlinePlus]

Code History

  • 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 (First year ICD-10-CM implemented into the HIPAA code set)