ICD-10 Code G30.9 – Alzheimer’s disease, unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G30.9 – Alzheimer’s disease, unspecified
What it is
G30.9 identifies Alzheimer’s disease when the record confirms the diagnosis but does not specify a subtype or further detail. Use it for documented Alzheimer’s disease without added qualifiers.
Clinical signs
Clinical features vary; refer to documentation. Commonly, records describe progressive memory loss, impaired reasoning, language difficulty, and decline in daily function consistent with Alzheimer’s disease.
When to use this code
Use this code when the provider documents Alzheimer’s disease and does not identify early onset, late onset, or another specified form. It also fits when the note supports dementia due to Alzheimer’s disease but remains nonspecific. Check documentation if another dementia type is named.
Do not use for
Do not use G30.9 for other dementias, such as vascular, Lewy body, or frontotemporal dementia. Do not use it when the provider specifies a different Alzheimer’s subtype.
Coding tip
Code the highest level of documented specificity, and query the provider if the record suggests a more specific Alzheimer’s diagnosis.