ICD-10 Code G30.1 – Alzheimer’s disease with late onset (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G30.1 – Alzheimer’s disease with late onset
What it is
G30.1 identifies Alzheimer’s disease with late onset, meaning the dementia syndrome is due to Alzheimer pathology and begins later in life. Use it when the record clearly states late-onset Alzheimer’s disease.
Clinical signs
Typical findings include progressive memory loss, impaired judgment, and worsening ability to manage daily activities. Clinical features vary; refer to documentation for the provider’s diagnosis and onset timing.
When to use this code
Use G30.1 when the clinician documents late-onset Alzheimer’s disease or late-onset dementia due to Alzheimer’s disease. It fits outpatient and inpatient records when the diagnosis is established and supported in the note. If onset is not specified, check documentation.
Do not use for
Do not use this code for dementia from other causes, such as vascular or unspecified dementia. Do not apply it when the record only says “memory loss” or when Alzheimer’s type and onset are not documented.
Coding tip
Verify that “late onset” is explicitly stated before assigning G30.1.