ICD-10 Code G30 – Alzheimer’s Disease (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G30 – Alzheimer’s disease
What it is
G30 identifies Alzheimer’s disease, a progressive neurodegenerative disorder that causes worsening memory loss and cognitive decline. Use it when documentation states Alzheimer’s disease, with or without behavioral or other specified manifestations.
Clinical signs
Common findings include gradual memory impairment, confusion, language difficulty, and reduced ability to perform daily activities. Clinical features vary; refer to documentation for the documented stage or manifestation.
When to use this code
Use G30 when the provider documents Alzheimer’s disease as the diagnosis, including early or late onset if specified elsewhere in the record. Code it when the chart supports dementia or cognitive decline attributed to Alzheimer’s disease. Check documentation for any associated manifestation code requirements.
Do not use for
Do not use G30 for unspecified dementia, vascular dementia, or cognitive symptoms without a documented Alzheimer’s diagnosis. If the record is unclear, check documentation.
Coding tip
Match the Alzheimer’s diagnosis to the documented manifestation and stage, and assign additional codes when the record requires them.