Alzheimer’s ICD 10

In the US version of the International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM), Alzheimer’s disease is coded in category G30. The main codes are G30.0 for Alzheimer’s disease with early onset, G30.1 for late onset, G30.8 for other Alzheimer’s disease and G30.9 for Alzheimer’s disease, unspecified. When Alzheimer’s has caused dementia, a second code from the F02 group, dementia in other diseases classified elsewhere, is usually added to describe the dementia itself.

Most people who search for this phrase have spotted a code on an insurance statement, a visit summary or a care facility form and want to know what it says. Others are students, new coders or caregivers handling paperwork. This guide gives a big-picture tour of how the codes are organized, why they appear in pairs and what they can and cannot tell you. It is not a substitute for official coding guidance, so anyone assigning codes professionally should confirm them in the current ICD-10-CM index and tabular list.

What ICD-10 Codes Are For

ICD codes are a shared language for diagnoses. Doctors, hospitals, insurers, Medicare, researchers and public health agencies use them to record what a patient has been diagnosed with, to process billing, to track disease trends and to study outcomes. The World Health Organization maintains the international ICD, and the United States uses its own clinical modification, ICD-10-CM, which adds more detail. In the US the system is maintained by the CDC’s National Center for Health Statistics together with the Centers for Medicare and Medicaid Services, and it is updated every year, usually effective October 1.

The G30 Family at a Glance

Alzheimer’s disease sits in Chapter 6 of ICD-10-CM, which covers diseases of the nervous system. That placement reflects that Alzheimer’s is a neurological disease of the brain.

The category G30 itself is not used alone for billing, because a complete code requires the fourth character. Coders therefore choose one of the specific codes above.

Why There Is Often a Second Code

ICD-10-CM separates the underlying disease from its manifestation. G30 identifies the disease, Alzheimer’s. The dementia that results is captured with a code from F02, a category in the mental and behavioral chapter titled dementia in other diseases classified elsewhere. Official instructions tell coders to list the underlying condition first, so you will typically see a G30 code followed by an F02 code.

Since the October 2022 update, the F02 codes also describe dementia severity, such as mild, moderate, severe or unspecified, and whether there are accompanying symptoms like agitation, psychotic features, mood disturbance or anxiety. Examples include F02.80 for unspecified severity without those disturbances and the F02.A, F02.B and F02.C groups for mild, moderate and severe dementia. Not every person with Alzheimer’s has dementia; someone in the mild cognitive impairment stage may be coded differently.

Related Codes You May Notice

Alzheimer’s codes sometimes appear near other memory-related entries. Mild cognitive impairment has its own code in the G31 category of the nervous system chapter, and other causes of dementia, such as vascular dementia, frontotemporal disease or Lewy body disease, have their own codes as well. A record may also list symptom codes, for example for memory loss or wandering, especially before a diagnosis is confirmed. Seeing several codes together usually means the clinician is documenting both the cause and its effects on daily life.

Reading Codes on Your Own Paperwork

• Visit summaries and patient portals often list diagnosis codes alongside plain-language descriptions.
• Explanation of benefits statements from insurers may show codes connected to each service.
• Care facility and home care forms may request codes to document needs and eligibility.
• Disability, long-term care insurance or legal forms sometimes require the diagnosis code plus supporting records.

If a code looks wrong, for example an early-onset code for someone whose symptoms began at 80, it is reasonable to ask the doctor’s office to review it. Coding errors can affect claims, records and future care decisions.

How the International and Newer Versions Differ

Outside the US, the WHO version of ICD-10 also uses G30 for Alzheimer’s disease but handles the dementia side differently, with a category beginning with F00 for dementia in Alzheimer’s disease. The WHO has since released ICD-11, which reorganizes neurological and dementia diagnoses with new alphanumeric codes. The United States has not yet adopted ICD-11 for clinical coding, so ICD-10-CM remains the standard for US medical records and billing for now.

Frequently Asked Questions

Is there one single ICD-10 code for Alzheimer’s?

No. The G30 category has several codes depending on onset, and a dementia code is often added when dementia is present.

Who decides which code is used?

The treating clinician documents the diagnosis, and trained coders translate that documentation into codes according to official guidelines.

Can a code change over time?

Yes. As more information is documented, or as dementia severity changes, the codes on a person’s record may be updated.

Learn more about Alzheimer’s from the Alzheimer’s Association at alz.org, the National Institute on Aging at nia.nih.gov and coding resources from the CDC at cdc.gov.

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