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G31

⚠ Non-billable (Header)

Other degenerative diseases of nervous system, not elsewhere classified

Diseases of the nervous system (G00-G99)

⚠️ This is a category header code — not billable. Use a more specific child code below.

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📋 Code Instructions

  • • 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-)

⚠️ Excludes2

direct

May be coded together if both conditions coexist

  • • Reye's syndrome (G93.7)

Child Codes (5)

G31.0Frontotemporal dementiaG31.1Senile degeneration of brain, not elsewhere classifiedG31.2Degeneration of nervous system due to alcoholG31.8Other specified degenerative diseases of nervous systemG31.9Degenerative disease of nervous system, unspecified

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Code Information

CodeG31
BillableNo — Header code
CategoryDiseases of the nervous system (G00-G99)
Excludes10 rule(s)
Excludes21 note(s)
Child codes5

Data Source

CMS ICD-10-CM 2026 Tabular List

Updated October 1, 2025 (FY2026)