G31.8Header code — not billable
Other specified degenerative diseases of nervous system
- Chapter
- 6. Diseases of the nervous system
- Category
- G31
- Effective date
- October 1, 2026
Related codes in category G31
G31Oth degenerative diseases of nervous system, NECG31.0Frontotemporal dementiaG31.01Pick's diseaseYesG31.09Other frontotemporal neurocognitive disorderYesG31.1Senile degeneration of brain, not elsewhere classifiedYesG31.2Degeneration of nervous system due to alcoholYesG31.80Leukodystrophy, unspecifiedYesG31.81Alpers diseaseYesG31.82Leigh's diseaseYesG31.83Neurocognitive disorder with Lewy bodiesYesG31.84Mild cognitive impairment of uncertain or unknown etiologyYesG31.85Corticobasal degenerationYes
Frequently asked questions
What is ICD-10 code G31.8?
G31.8 is an ICD-10-CM diagnosis code for Other specified degenerative diseases of nervous system.
Is G31.8 a billable code?
No. G31.8 is a category/header code, not billable on its own — use one of its more specific child codes instead.
What ICD-10-CM chapter is G31.8 in?
G31.8 falls under Chapter 6: Diseases of the nervous system.
When did G31.8 become effective?
G31.8 has been effective since October 1, 2026, per the CMS/CDC ICD-10-CM annual release.
What other codes are related to G31.8?
G31.8 belongs to category G31, which includes 12 other codes — see the related codes list on this page.
ICD-10-CM data maintained by CDC/CMS (public domain). Always verify codes with authoritative sources before making coding or billing decisions.