ICD-10-CM G31.8: Other specified degenerative diseases of nervous system

ICD-10-CM Diagnosis Code (2025)

Official Description for G31.8

Other specified degenerative diseases of nervous system

Coding Notes & Guidelines for G31.8

Excludes1: Not Coded Here
  • age related cognitive decline (R41.81)
  • altered mental status (R41.82)
  • cerebral degeneration (G31.9)
  • cerebrovascular diseases (I60-I69)
  • change in mental status (R41.82)
  • cognitive deficits following (sequelae of) cerebral hemorrhage or infarction (I69.01-, I69.11-, I69.21-, I69.31-, I69.81-, I69.91-)
  • cognitive impairment due to intracranial or head injury (S06.-)
  • dementia (F01.-, F02.-, F03.-)
  • mild neurocognitive disorder due to a known physiological condition (F06.7-)
  • neurologic neglect syndrome (R41.4)
  • personality change, nonpsychotic (F68.8)
Use Additional Code

code, if applicable, to identify mild neurocognitive disorders due to known physiological condition (F06.7-)

Use Additional Code
  • code to identify presence of:
  • alcohol abuse and dependence (F10.-)
  • exposure to environmental tobacco smoke (Z77.22)
  • history of tobacco dependence (Z87.891)
  • hypertension (I10-I1A)
  • occupational exposure to environmental tobacco smoke (Z57.31)
  • tobacco dependence (F17.-)
  • tobacco use (Z72.0)
Inclusion Terms

Grey-matter degeneration

Inclusion Terms

Subacute necrotizing encephalopathy

Inclusion Terms
  • Lewy body dementia
  • Lewy body disease
Inclusion Terms
  • Mild cognitive disorder NOS
  • Mild neurocognitive disorder of uncertain or unknown etiology

Parent Code (Less Specific):

G31 - Other degenerative diseases of nervous system, not elsewhere classified

About ICD-10-CM Code G31.8 (Other specified degenerative diseases of nervous system)

ICD-10-CM code G31.8 is a billable or specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes. The 2025 edition of ICD-10-CM G31.8 became effective on October 1, 2024.

This page provides detailed information about G31.8 - Other specified degenerative diseases of nervous system. It includes common terminology, coding guidelines such as "Includes," "Excludes1," and "Excludes2" notes, and information on required 7th characters. Utilizing this information correctly is essential for accurate medical coding and claims submission for conditions like Other specified degenerative diseases of nervous system.