2026 ICD-10-CM Diagnosis Code G30.1Alzheimer's disease with late onset

ICD-10-CM Codes›G00–G99›G30-G32›G30

ICD-10-CM G30.1
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

G30.1 is a billable ICD-10-CM diagnosis code for Alzheimer's disease with late onset. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026). The code is restricted by the Medicare Code Editor to adult patients (age 15 through 124). In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Neurocognitive disorders.

Code Identity

ICD-10-CM Code
G30.1
Billable Status
Yes — Valid for Submission
Code Describes
Alzheimer's disease with late onset
Short Description
Alzheimer's disease with late onset
Same as the full description in the CMS dataset.
Parent Code
G30
Alzheimer's disease

Code Classification

ChapterG00–G99Diseases of the nervous system
SectionG30-G32Other degenerative diseases of the nervous system
CategoryG30Alzheimer's disease
This CodeG30.1Alzheimer's disease with late onset

Code EditsBilling

Medicare Code Editor checks that affect claim validity for G30.1.

Adult diagnoses
The Medicare Code Editor detects inconsistencies in adult cases by checking a patient's age and any diagnosis on the patient's record. The adult code edits apply to patients age range is 15–124 years inclusive (e.g., senile delirium, mature cataract).

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Alzheimer's disease with delusions
  • Alzheimer's disease with psychosis
  • Dementia in remission
  • Familial Alzheimer's disease of late onset
  • Non-familial Alzheimer's disease of late onset
  • Primary degenerative dementia of the Alzheimer type, senile onset
  • Primary degenerative dementia of the Alzheimer type, senile onset in remission
  • Primary degenerative dementia of the Alzheimer type, senile onset, uncomplicated
  • Primary degenerative dementia of the Alzheimer type, senile onset, with behavioral disturbance
  • Primary degenerative dementia of the Alzheimer type, senile onset, with delirium
  • Primary degenerative dementia of the Alzheimer type, senile onset, with delusions
  • Primary degenerative dementia of the Alzheimer type, senile onset, with depression
  • Senile dementia with delirium
  • Senile dementia with delusion
  • Senile dementia with depression
  • Senile dementia with depressive or paranoid features
  • Senile dementia with psychosis

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

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

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR NVS011
Neurocognitive disorders
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Alzheimer's Disease

Alzheimer's disease (AD) is the most common form of dementia among older people. Dementia is a brain disorder that seriously affects thinking and memory skills. If you have AD, it can impair your ability to reason or learn new skills until it becomes difficult to complete daily activities.

The full article covers:

  • What is Alzheimer's disease?
  • What are the symptoms of Alzheimer's disease?
  • Who is more likely to develop Alzheimer's disease?
  • How is Alzheimer's disease diagnosed?
  • What are the treatments for Alzheimer's disease?
  • Can Alzheimer's disease be prevented?

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert G30.1 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
331.0 Alzheimer's disease
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About G30.1Overview

Is G30.1 (Alzheimer's disease) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report Alzheimer's disease with late onset on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

Who can G30.1 be reported for?

The Medicare Code Editor checks Alzheimer's disease with late onset against patient demographics: this code is intended for adult patients (age 15 through 124). Claims outside these limits are flagged as inconsistent.

What is the ICD-9 equivalent of G30.1?

Under the General Equivalence Mappings, Alzheimer's disease with late onset converts to ICD-9-CM 331.0 (Alzheimer's disease). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:

  • The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
  • The condition places limitations on self-care, independent living, and social interactions.