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    v1.0.28
    OpenPayerBilling CodesOther degenerative diseases of the nervous systemICD-10-CM g30-alzheimers-disease
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    ICD-10-CM Code For Alzheimer's Disease: Group Overview

    The International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM) code group G30 includes Alzheimer's disease diagnoses, covering Alzheimer's disease unspecified, early-onset, and Alzheimer's disease with behavioral disturbance or with unspecified behavioral symptoms. These ICD-10-CM diagnosis codes are used to document clinical scenarios such as progressive cognitive decline, memory impairment, and associated neurobehavioral symptoms, capturing disease severity and clinical complexity relevant to dementia care. Accurate coding within the ICD-10-CM G30 group supports proper claim adjudication, complete clinical documentation, and appropriate reimbursement.

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    ICD-10-CM G30: Alzheimer's Disease Overview

    The ICD-10-CM G30 diagnoses represent Alzheimer's disease and its specified subtypes, a progressive neurodegenerative disorder primarily affecting cognition and memory. These codes target diseases of the nervous system, specifically neurodegenerative conditions leading to dementia. Accurate coding matters for reimbursement because it documents disease severity and care needs that influence claim processing and payment.

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    When to Use

    Use a code from this group when a clinician documents Alzheimer's disease as the diagnosis, specifying subtype or associated behavioral symptoms when available. Apply these codes to reflect the clinical course and severity for documentation and billing of dementia-related care.

    ICD-10-CM Codes

    4 rows

    ICD-10-CM CodeDescription
    G30.0Alzheimer's disease with early onset
    G30.1Alzheimer's disease with late onset
    G30.8Other Alzheimer's disease
    G30.9Alzheimer's disease, unspecified

    DRG Codes

    2 rows

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

    Typical Clinical Scenarios

    • An elderly patient in a memory clinic presents with progressive short-term memory loss over several years, increasing difficulty with orientation, and impaired instrumental activities of daily living noted by caregivers. Neuropsychological testing and brain imaging support a diagnosis of Alzheimer-type dementia with gradual cognitive decline; no early-onset features are present. A code from this group is assigned to document the chronic neurodegenerative dementia. Typical codes: G30.9.
    • A middle-aged adult with a family history of early-onset neurodegenerative disease develops progressive cognitive and functional decline before age 65, with confirmed Alzheimer-type pathology on genetic testing or biomarker studies. The patient is evaluated for early-onset dementia and initiation of long-term care planning, and an early-onset Alzheimer diagnosis from this group is recorded. Typical codes: G30.0, G30.1.
    • A nursing home resident with longstanding Alzheimer-type dementia is admitted to the hospital for acute behavioral agitation and one-week worsening of confusion possibly related to an intercurrent infection; the underlying chronic neurodegenerative disorder is documented as a comorbid condition that impacts management and discharge planning. A code from this group is used to capture the patient’s established Alzheimer disease as a comorbidity complicating the current acute issue. Typical codes: G30.9, G30.8.

    Related Codes

    G31-OTHER-DEGENERATIVE-NERVOUS-SYSTEM

    ICD-10-CM Code For Other Degenerative Diseases Of Nervous System Not Elsewhere Classified: 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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