G31.9 DEGENERATIVE DISEASE OF NERVOUS SYSTEM, UNSPECIFIED

Code Information

  • Diagnosis Code: G31.9
  • Short Description: Degenerative disease of nervous system, unspecified
  • Long Description: Degenerative disease of nervous system, unspecified
  • Code Version: 2025 ICD-10-CM

The code G31.9 is VALID for claim submission

Code Classification

Synonyms

  • Acquired cerebral atrophy
  • Atrophy of brainstem
  • Atrophy of caudate nucleus
  • Atrophy of cerebellar vermis
  • Atrophy of cortex of frontal and temporal lobe
  • Atrophy of cortex of frontal lobe
  • Atrophy of cortex of occipital lobe
  • Atrophy of cortex of parietal lobe
  • Atrophy of cortex of temporal lobe
  • Atrophy of hilum of dentate nucleus
  • Atrophy of hippocampus
  • Atrophy of hypothalamus
  • Atrophy of inner granular layer of cerebellar cortex
  • Atrophy of pons and cerebellum
  • Atrophy of Purkinje cells of cerebellar cortex
  • Atrophy of pyramidal tract
  • Atrophy of spinocerebellar tract
  • Autonomic nervous system disorder co-occurrent and due to neurodegenerative disorder
  • Cerebellar degeneration
  • Cerebral atrophy
  • Cerebral degeneration
  • Cerebral degeneration due to Creutzfeldt-Jakob disease
  • Cerebral degeneration due to Parkinson's disease
  • Cerebral degeneration presenting primarily with dementia
  • Chorea due to heredodegenerative disorder
  • Chronic deafness
  • Circumscribed atrophy of brain
  • Congenital blindness
  • Degenerative brain disorder
  • Degenerative disease of the central nervous system
  • Diffuse atrophy of cerebellum
  • Diffuse atrophy of cerebrum
  • Epilepsy co-occurrent and due to degenerative brain disorder
  • Fibrosis, neurodegeneration, cerebral angiomatosis syndrome
  • Frontal lobe degeneration
  • Frontal lobe degeneration with motor neurone disease
  • Frontotemporal degeneration
  • Gemignani syndrome
  • Global brain atrophy
  • Hemiatrophy of cerebellar cortex
  • Hemiatrophy of cerebral cortex
  • Hydrocephalus ex vacuo
  • Hydrocephalus ex vacuo due to degenerative brain disorder
  • Microphthalmia with brain atrophy syndrome
  • Parkinsonian pyramidal syndrome
  • Parkinsonism due to heredodegenerative disorder
  • Parkinsonism due to heredodegenerative disorder
  • PF-ILD-progressive fibrosing interstitial lung disease
  • Posterior cortical atrophy syndrome
  • Prieto Badia Mulas syndrome
  • Progressive focal cortical atrophy
  • Secondary cerebellar degeneration

Crosswalk Information

ICD-10 Code ICD-9 Code ICD-9 Description
G31.9 Right Arrow 330.9 Cereb degen in child NOS
331.9 Cereb degeneration NOS
This ICD-10 to ICD-9 data is based on the 2018 General Equivalency Mapping (GEM) files published by the Centers for Medicare & Medicaid Services (CMS) for informational purposes only. The data is not an ICD-10 conversion tool and doesn’t guarantee clinical accuracy.

Similar Codes

ICD-10 Code ICD-10 Description
G31 Other degenerative diseases of nervous system, not elsewhere classified
G31.0 Frontotemporal dementia
G31.01 Pick's disease
G31.09 Other frontotemporal neurocognitive disorder
G31.1 Senile degeneration of brain, not elsewhere classified
G31.2 Degeneration of nervous system due to alcohol
G31.8 Other specified degenerative diseases of nervous system
G31.80 Leukodystrophy, unspecified
G31.81 Alpers disease
G31.82 Leigh's disease
G31.83 Neurocognitive disorder with Lewy bodies
G31.84 Mild cognitive impairment of uncertain or unknown etiology
G31.85 Corticobasal degeneration
G31.86 Alexander disease
G31.87 Primary progressive apraxia of speech
G31.89 Other specified degenerative diseases of nervous system
This page was last updated on: 10/1/2025
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