G31.8Other specified degenerative diseases of nervous system
Code usage status
Primary diagnosis
May be used as the primary diagnosis
Apply only when it matches the confirmed diagnosis and the documented clinical record.
Specificity
Complete code in the classification
Use when the diagnosis matches and no exclusion applies.
- Chapter VI
- Diseases of the nervous system
- Group G30-G32
- Other degenerative diseases of the nervous system
- Official Vietnamese name
- Bệnh thoái hóa xác định khác của hệ thần kinh
- Additional WHO coding guidance
- Grey-matter degeneration [Alpers] Lewy body(ies)(dementia)(dis ease) (F02.8*) Subacute necrotizing encephalopathy [Leigh]
Related G31 codes
G31
Other degenerative diseases of nervous system, not elsewhere classified
G31.0
Primary diagnosis candidate
Circumscribed brain atrophy
G31.1
Primary diagnosis candidate
Senile degeneration of brain, not elsewhere classified
G31.2
Primary diagnosis candidate
Degeneration of nervous system due to alcohol
G31.9
Primary diagnosis candidate
Degenerative disease of nervous system, unspecified
Clinical record checklist
View coding guide →- Confirm that the code matches the final documented diagnosis.
- Use one primary-diagnosis code and record only relevant additional conditions.
- Review Ministry indicators, inclusions, exclusions and notes.
- Do not infer a diagnosis beyond the clinical record.
2026 regulatory basis
Indicators are taken from columns 24–29 of the classification accompanying Circular 06/2026/TT-BYT, cross-referenced with Decision 1849/QĐ-BYT and Official Dispatch 4059/BYT-BH.
