ICD-10 Code G30.0 – Alzheimer’s disease with early onset (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G30.0 – Alzheimer’s disease with early onset
What it is
G30.0 identifies Alzheimer’s disease with early onset, meaning the diagnosis of Alzheimer’s disease begins at a younger age than typical. Use it when the record specifically documents early-onset Alzheimer’s disease.
Clinical signs
Common findings include progressive memory loss, impaired reasoning, and worsening ability to perform familiar tasks. Clinical features vary; refer to documentation for the documented age of onset and cognitive decline pattern.
When to use this code
Use G30.0 when the provider clearly documents Alzheimer’s disease with early onset, including in assessment, problem list, or discharge diagnosis. If the note only says Alzheimer’s disease without age of onset, check documentation before assigning this code.
Do not use for
Do not use this code for unspecified Alzheimer’s disease or other dementias with a different cause. Do not assume early onset from age alone; the chart must support the diagnosis.
Coding tip
Verify that “early onset” appears in the provider’s documentation before coding G30.0.