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    OpenPayerBilling CodesOther degenerative diseases of the nervous systemICD-10-CM g31-other-degenerative-nervous-system
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    ICD-10-CM Code For Other Degenerative Diseases Of Nervous System Not Elsewhere Classified: Group Overview

    The International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM) code group G31 includes degenerative diseases of the nervous system that are not classified elsewhere, such as other specified and unspecified neurodegenerative conditions affecting the brain and spinal cord. These ICD-10-CM diagnosis codes are used to document progressive neurologic dysfunction, atypical presentations, and chronic degenerative processes that may affect cognitive, motor, or autonomic function. Accurate coding within the ICD-10-CM G31 group supports proper claim adjudication, complete clinical documentation, and appropriate reimbursement.

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    ICD-10-CM G31: Other Degenerative Diseases Of Nervous System, Not Elsewhere Classified Overview

    This group represents degenerative disorders of the nervous system that are not classified elsewhere, including various atypical or less common neurodegenerative conditions affecting the central nervous system. These diagnoses target neurologic structures such as the brain and spinal cord and often involve progressive loss of function. Accurate coding supports appropriate clinical documentation and reimbursement by ensuring claims reflect the specific degenerative process and care complexity.

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    When to Use

    Use a code from this group when a clinician documents a degenerative nervous system disorder that cannot be classified to a more specific ICD-10-CM code elsewhere. Codes in this group are appropriate for atypical, unspecified, or other specified neurodegenerative presentations affecting cognition, motor control, or autonomic functions.

    ICD-10-CM Codes

    14 rows

    ICD-10-CM CodeDescription
    G31.01Pick's disease
    G31.09Other frontotemporal neurocognitive disorder
    G31.1Senile degeneration of brain, not elsewhere classified
    G31.2Degeneration of nervous system due to alcohol
    G31.80Leukodystrophy, unspecified
    G31.81Alpers disease
    G31.82Leigh's disease
    G31.83Neurocognitive disorder with Lewy bodies
    G31.84Mild cognitive impairment of uncertain or unknown etiology
    G31.85Corticobasal degeneration
    G31.86Alexander disease
    G31.87Primary progressive apraxia of speech
    G31.89Other specified degenerative diseases of nervous system
    G31.9Degenerative disease of nervous system, unspecified

    DRG Codes

    2 rows

    DRG CodeDescription
    056Degenerative Nervous System Disorders with MCC
    057Degenerative Nervous System Disorders without MCC

    Typical Clinical Scenarios

    • An older adult (typically >65) presents to neurology clinic with progressive memory loss, difficulty with complex tasks, and gradual decline in executive function over 18–24 months without evidence of cerebrovascular disease or Parkinsonism; neurocognitive testing shows multi-domain impairment and MRI demonstrates generalized cortical and hippocampal atrophy consistent with a primary degenerative dementia, so a code from this group is assigned to capture the non-Alzheimer’s degenerative cognitive disorder. Typical codes: G31.09, G31.84
    • A middle-aged patient develops new-onset gait disturbance, limb stiffness, and autonomic symptoms (orthostatic hypotension, urinary retention) with progressive motor decline over several years; movement disorder evaluation suggests a multisystem degenerative condition distinct from idiopathic Parkinson disease, prompting assignment of a code from this group to record the atypical parkinsonism. Typical codes: G31.82, G31.81
    • A patient with long-standing neurologic disease is hospitalized for aspiration pneumonia and poor oral intake; their medical record documents advanced neurodegeneration with severe dysphagia and increased care needs as a comorbidity contributing to the admission, so a relevant degenerative nervous system code from this group is used to reflect the underlying chronic neurologic condition. Typical codes: G31.9, G31.89

    Related Codes

    G30-ALZHEIMERS-DISEASE

    ICD-10-CM Code For Alzheimer's Disease: Group Overview

    G32-OTHER-DEGENERATIVE-NERVOUS-SYSTEM-DISORDERS

    ICD-10-CM Code For Other Degenerative Disorders Of Nervous System In Diseases Classified Elsewhere: Group Overview

    Frequently Asked Questions

    References

    1. 1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
    2. 2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
    3. 3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.
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