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    v1.0.28
    OpenPayerBilling CodesExtrapyramidal and movement disordersICD-10-CM g20-parkinsons-disease
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    ICD-10-CM Code For Parkinsons Disease: Group Overview

    The International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM) code group G20 includes primary Parkinson disease diagnoses characterized by progressive degeneration of dopaminergic neurons leading to motor and nonmotor symptoms. These ICD-10-CM diagnosis codes are used to document clinical encounters for Parkinson disease, capturing disease manifestations, motor severity, and related complications that affect treatment and care planning. Accurate coding within the ICD-10-CM G20 group supports proper claim adjudication, complete clinical documentation, and appropriate reimbursement.

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    ICD-10-CM G20: Parkinson's Disease Overview

    This group represents primary Parkinson disease and related extrapyramidal movement disorder diagnoses affecting the central nervous system, particularly the basal ganglia and motor control pathways. These conditions target motor function, causing tremor, rigidity, bradykinesia, and postural instability, with possible nonmotor features. Accurate coding supports clinical decision-making, complete documentation, and correct reimbursement for services related to long-term management and complications.

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    When to Use

    Use a code from this group when a clinician documents a diagnosis of primary Parkinson disease as the reason for the encounter or when coding care related to management of Parkinson disease symptoms and complications. Assign codes to reflect the documented disease and any specified manifestations or complications present during the visit.

    ICD-10-CM Codes

    5 rows

    ICD-10-CM CodeDescription
    G20.A1Parkinson's disease without dyskinesia, without mention of fluctuations
    G20.A2Parkinson's disease without dyskinesia, with fluctuations
    G20.B1Parkinson's disease with dyskinesia, without mention of fluctuations
    G20.B2Parkinson's disease with dyskinesia, with fluctuations
    G20.CParkinsonism, unspecified

    DRG Codes

    2 rows

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

    Related Codes

    G21-SECONDARY-PARKINSONISM

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

    G23-OTHER-DEGENERATIVE-DISEASES-BASAL-GANGLIA

    ICD-10-CM Code For Other Degenerative Diseases Of Basal Ganglia: 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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