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    v1.0.28
    OpenPayerBilling CodesExtrapyramidal and movement disordersICD-10-CM g23-other-degenerative-diseases-basal-ganglia
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    ICD-10-CM Code For Other Degenerative Diseases Of Basal Ganglia: Group Overview

    The International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM) code group G23 includes degenerative disorders of the basal ganglia such as progressive supranuclear palsy, corticobasal degeneration, and other specified degenerative extrapyramidal diseases that cause movement and motor control abnormalities. These ICD-10-CM diagnosis codes are used to document clinical encounters for patients with atypical parkinsonism and related movement disorders, capturing disease features, progression, and organ system involvement relevant to neurological function. Accurate coding within the ICD-10-CM G23 group supports proper claim adjudication and complete clinical documentation for appropriate reimbursement.

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    ICD-10-CM G23: Other Degenerative Diseases Of Basal Ganglia Overview

    This code group captures degenerative disorders primarily affecting the basal ganglia, a brain region that regulates movement and coordination. Conditions in this group include atypical parkinsonian syndromes and other degenerative extrapyramidal disorders that produce tremor, rigidity, bradykinesia, and postural instability. Accurate coding matters for appropriate claim adjudication and reflects clinical complexity for reimbursement.

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    When to Use

    Use a code from this group when the patient has a documented degenerative basal ganglia disorder such as progressive supranuclear palsy, corticobasal degeneration, or other specified degenerative extrapyramidal disease. Assign codes to reflect the specific syndrome diagnosed and any clinical complications or manifestations described in the medical record.

    ICD-10-CM Codes

    6 rows

    ICD-10-CM CodeDescription
    G23.0Hallervorden-Spatz disease
    G23.1Progressive supranuclear ophthalmoplegia [Steele-Richardson-Olszewski]
    G23.2Striatonigral degeneration
    G23.3Hypomyelination with atrophy of the basal ganglia and cerebellum
    G23.8Other specified degenerative diseases of basal ganglia
    G23.9Degenerative disease of basal ganglia, 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 with progressive parkinsonism not responsive to dopaminergic therapy presents for evaluation of worsening bradykinesia, postural instability, and poor gaze control over several years. Neurologic exam shows vertical supranuclear gaze palsy and early falls, prompting consideration of an atypical degenerative basal ganglia disorder rather than idiopathic Parkinson disease; a code from this group is assigned to capture the other degenerative process. Typical codes: G23.1, G23.2
    • A middle-aged patient with a known diagnosis of a degenerative basal ganglia disorder develops acute worsening of movement symptoms with prominent dystonia and choreiform movements after medication changes, leading to urgent neurology consultation. The acute exacerbation of extrapyramidal signs in the context of the underlying degenerative disease is documented and coded to reflect the underlying basal ganglia degeneration causing the movement disorder. Typical codes: G23.0, G23.8
    • A patient with an established neurodegenerative movement disorder is hospitalized for aspiration pneumonia and generalized decline; the basal ganglia disease is recorded as a comorbid chronic condition contributing to dysphagia and immobility. The chronic degenerative process of the extrapyramidal system is noted on the problem list and coded to capture its role in current complications and care planning. Typical codes: G23.9, G23.3

    Related Codes

    G20-PARKINSONS-DISEASE

    ICD-10-CM Code For Parkinsons Disease: Group Overview

    G21-SECONDARY-PARKINSONISM

    ICD-10-CM Code For Secondary Parkinsonism: Group Overview

    G24-DYSTONIA

    ICD-10-CM Code For Dystonia: Group Overview

    G25-OTHER-EXTRAPYRAMIDAL-MOVEMENT-DISORDERS

    ICD-10-CM Code For Other Extrapyramidal And Movement Disorders: Group Overview

    G26-EXTRAPYRAMIDAL-AND-MOVEMENT-DISORDERS

    ICD-10-CM Code For Extrapyramidal And Movement Disorders 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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