G30.9 — Alzheimer's disease, unspecified

G30.9

ICD-10 Chapter 6: Nervous System — illustrative image — Chapter 6: Diseases of the nervous system (G00–G99) — illustrative image

What this code means

Alzheimer's disease is the most common cause of dementia, with progressive loss of memory and thinking skills.

Also called: alzheimers disease, alzheimer dementia.

When this code is used

Used for Alzheimer's disease when the onset type is not specified.

Where it sits in ICD-10-CM

Code G30.9 belongs to Chapter 6: Diseases of the nervous system, which covers codes G00–G99 in the FY2027 ICD-10-CM tabular list. The official description above is copied verbatim from the CDC/NCHS FY2027 code file.

Related symptoms

Related anatomy

Brain

Frequently asked questions

What is ICD-10-CM code G30.9?

G30.9 is the ICD-10-CM diagnosis code for “Alzheimer's disease, unspecified”. Alzheimer's disease is the most common cause of dementia, with progressive loss of memory and thinking skills.

When is code G30.9 used?

Used for Alzheimer's disease when the onset type is not specified. It belongs to Chapter 6 of ICD-10-CM (Diseases of the nervous system).

This guide explains ICD-10-CM codes in plain language for patients, students and other readers. It is educational information only — not coding, billing or medical advice. The code recorded for any real encounter is assigned from the full clinical documentation by the treating team and qualified coders, and only they can decide which code fits a specific case.