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G31 ⚠ Non-billable

Other degenerative diseases of nervous system, not elsewhere classified

ICD-10-CM · FY2026 · Diseases of the Nervous System

Code
G31
System
ICD-10-CM
Billable
No — use specific code
Effective
FY2026
Chapter
Diseases of the Nervous System
Source
CMS / CDC NCHS
⚠ Verify before billing. Confirm against the current CMS/NCHS ICD-10-CM files and your payer's rules before claims submission.

Official coding notes

From CMS's ICD-10-CM Tabular List.

Excludes2 — not included here, but may code together
  • Reye's syndrome (G93.7)
Use additional code
  • code, if applicable, for codes G31.0-G31.83, G31.85-G31.9, to identify:
  • 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-)

Frequently asked questions

What is ICD-10 code G31?
ICD-10-CM code G31 represents Other degenerative diseases of nervous system, not elsewhere classified. It is a non-billable header code requiring a more specific subcategory in the Diseases of the Nervous System chapter, effective October 1, 2025 – September 30, 2026.
Is G31 billable?
No. G31 is a non-billable header. Select a more specific subcategory for claims submission.
What chapter is G31 in?
G31 belongs to the Diseases of the Nervous System chapter (G00–G99) of ICD-10-CM.

Related codes in the G31 category

G31.0 Frontotemporal dementia Non-billable G31.1 Senile degeneration of brain, not elsewhere classified Billable G31.2 Degeneration of nervous system due to alcohol Billable G31.8 Other specified degenerative diseases of nervous system Non-billable G31.9 Degenerative disease of nervous system, unspecified Billable G31.01 Pick's disease Billable G31.09 Other frontotemporal neurocognitive disorder Billable G31.80 Leukodystrophy, unspecified Billable

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