G30.1 Alzheimer's disease with late onset

Billable ICD-10-CM code, FY2026.

Applies from G30 Alzheimer's disease

Includes

• Alzheimer's dementia senile and presenile forms

Excludes1 (never code together)

• senile degeneration of brain NEC (G31.1)
• senile dementia NOS (F03.-)
• senility NOS (R41.81)

Use additional code

• 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)
• dementia without behavioral disturbance (F02.80, F02.A0, F02.B0, F02.C0)
• mild neurocognitive disorder due to known physiological condition (F06.7-)

Risk adjustment (HCC)

• CMS-HCC V28: HCC 127 — Dementia, Mild or Unspecified
• RxHCC V08: HCC 111 — Alzheimer's Disease
• ESRD V24: HCC 52

MS-DRG index

Defines the logic of DRG(s) 056-057 in MDC 01.

Approximate ICD-9-CM (GEMs)

• 331.0 Alzheimer's disease (approximate)

Medicare Code Edits (MCE v43.1 (April 2026))

• Adult diagnoses (age 15 through 124): Age conflict edit. These diagnoses are clinically expected only in patients age 15 through 124.

Code annotations containing back-references to G30.1

Back-references to G30

• Code First: F02 Dementia in other diseases classified elsewhere ("Alzheimer's (G30.-)")
• Code First: F06.7 Mild neurocognitive disorder due to known physiological condition ("Alzheimer's disease (G30.-)")
• Type 1 Excludes: G31.1 Senile degeneration of brain, not elsewhere classified ("Alzheimer's disease (G30.-)")
• Code First: Z91.83 Wandering in diseases classified elsewhere ("Alzheimer's disease (G30.-)")

Diagnosis Index entries for G30.1

• Disease, diseased › Alzheimer's › late onset
• Disease, diseased › Alzheimer's › late onset › with behavioral disturbance

Nearby codes

• G30 Alzheimer's disease
• G30.0 Alzheimer's disease with early onset
• G30.1 Alzheimer's disease with late onset (this code)
• G30.8 Other Alzheimer's disease
• G30.9 Alzheimer's disease, unspecified