2026 ICD-10-CM Diagnosis Code G31Other degenerative diseases of nervous system, not elsewhere classified
G31 is a non-billable ICD-10-CM category code for other degenerative diseases of nervous system, not elsewhere classified, so it cannot be submitted on claims. Use a more specific code from this category instead, such as G31.01, G31.09, G31.1, and G31.2.
Code Identity
Code Classification
Specific Coding for Oth degenerative diseases of nervous system, NECOverview
Non-specific codes like G31 require more characters. Use one of these billable codes instead:
G31.0 for Frontotemporal dementia
Use G31.01 for Pick's disease
Use G31.09 for Other frontotemporal neurocognitive disorder
Use G31.1 for Senile degeneration of brain, not elsewhere classified
Use G31.2 for Degeneration of nervous system due to alcohol
G31.8 for Other specified degenerative diseases of nervous system
Use G31.80 for Leukodystrophy, unspecified
Use G31.81 for Alpers disease
Use G31.82 for Leigh's disease
Use G31.83 for Neurocognitive disorder with Lewy bodies
Use G31.84 for Mild cognitive impairment of uncertain or unknown etiology
Use G31.85 for Corticobasal degeneration
Use G31.86 for Alexander disease
Use G31.87 for Primary progressive apraxia of speech
Use G31.89 for Other specified degenerative diseases of nervous system
Use G31.9 for Degenerative disease of nervous system, unspecified
Tabular List NotesGuidance
Coding notes and annotation back-references applicable to this code.
Use Additional Code
- code, if applicable, for codes G31.0 G31.83 G31.85 G31.9
- dementia with anxiety F02.84 F02.A4 F02.B4 F02.C4
- dementia with behavioral disturbance F02.81 F02.A1 F02.B1 F02.C1
- dementia with mood disturbance F02.83 F02.A3 F02.B3 F02.C3
- dementia with psychotic disturbance F02.82 F02.A2 F02.B2 F02.C2
- dementia without behavioral disturbance F02.80 F02.A0 F02.B0 F02.C0
- mild neurocognitive disorder due to known physiological condition F06.7
Type 2 Excludes
- Reye's syndrome G93.7
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.
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.
Patient EducationClinical
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.
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Code HistoryHistory
Questions About G31Overview
Is G31 a billable code?
No. This is a category header that groups the codes for other degenerative diseases of nervous system, not elsewhere classified, and headers cannot be submitted on claims. Claims for other degenerative diseases of nervous system, not elsewhere classified need a more specific code from this category, such as G31.01, G31.09, and G31.1.
