ICD-10-CM 2027
ICD-10 code for Alzheimer's disease
Confirmed by the official ICD-10-CM index entry “disease, diseased › alzheimer's”. Page updated September 29, 2026.
About coding Alzheimer's disease
The ICD-10-CM code for Alzheimer's disease is G30.9 (Alzheimer's disease, unspecified). The official index lists 3 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on G30.9.
It is also searched as Alzheimer's.
Within G30, choose G30.9 (unspecified) only when documentation doesn't support a more specific option: with early onset (G30.0), with late onset (G30.1) and other Alzheimer's disease (G30.8).
Use an additional code, if applicable, to identify: delirium, if applicable (F05), dementia with anxiety (F02.84, F02.A4, F02.B4, F02.C4), dementia with behavioral disturbance (F02.81-, F02.A1-, F02.B1-, F02.C1-), dementia with mood disturbance (F02.83, F02.A3, F02.B3, F02.C3), dementia with psychotic disturbance (F02.82, F02.A2, F02.B2, F02.C2) and 2 more.
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
Related Alzheimer's disease codes
Common questions about Alzheimer's disease ICD-10 codes
What is the ICD-10 code for Alzheimer's disease?
- G30.9 — Alzheimer's disease, unspecified. More specific codes apply when the documentation supports them: G30.0, G30.1, G30.8.
What is the ICD-10 code for alzheimer's disease with early onset?
- G30.0 — Alzheimer's disease with early onset.
What is the ICD-10 code for alzheimer's disease with late onset?
- G30.1 — Alzheimer's disease with late onset.
What is the ICD-10 code for other alzheimer's disease?
- G30.8 — Other Alzheimer's disease.
Is G30.9 billable?
- Yes. G30.9 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can G30.9 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict G30.9 as a principal diagnosis.
Is G30.9 a CC or MCC?
- No. G30.9 is neither a CC nor an MCC under MS-DRG v44.0.