ICD-10-CM · Chapter 6 · G00-G99
G30 Alzheimer's disease
Includes
- Alzheimer's dementia senile and presenile forms
Excludes 1 (cannot be coded 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-)
Subcodes
Each subcode links to a detail page with full clinical annotations.
Related pages
In Spanish: enfermedad de Alzheimer → (Alzheimer's Disease, in the US Medical Glossary)
Plain-language term for this code
The following entry in the US Medical Glossary corresponds to ICD-10-CM category G30:
- Alzheimer's Disease — Enfermedad de Alzheimer
In Spanish
The condition this category covers is called Enfermedad de Alzheimer in Spanish. The glossary entry gives the term in eight more languages and phrases for an appointment.
Coding notes for G30
- G30 is a three-character category heading and is not billable on its own. The Official Guidelines state that "a three-character code is to be used only if it is not further subdivided" and that diagnosis codes are reported "at their highest number of characters available". Of the 4 child codes listed above, 4 are billable.
- The category carries a "use additional code" note: delirium (F05), dementia with or without behavioral or psychological disturbance (F02.-) and mild neurocognitive disorder due to known physiological condition (F06.7-) are reported in addition, if applicable.
- Senile degeneration of brain NEC (G31.1), senile dementia NOS (F03.-) and senility NOS (R41.81) are Excludes1 for the whole category, so they are not reported together with a G30 code.
How to read the notes
- Includes
- Appears under a three-character code title "to further define, or give examples of, the content of the category."
- Excludes1
- "A type 1 Excludes note is a pure excludes note. It means 'NOT CODED HERE!'" The excluded code "should never be used at the same time as the code above the Excludes1 note."
- Excludes2
- "A type 2 Excludes note represents 'Not included here.'" The excluded condition is not part of this code, "but a patient may have both conditions at the same time", so both codes may be used together when appropriate.
- Code first / Use additional code
- Sequencing rules: when a "code first" note is present and an underlying condition is present, "the underlying condition should be sequenced first, if known."
- Code also
- "Two codes may be required to fully describe a condition, but this note does not provide sequencing direction."
Sources
- ICD-10-CM Files, FY2027 release (effective October 1, 2026) — CDC National Center for Health Statistics
- ICD-10-CM Official Guidelines for Coding and Reporting, FY 2027 — CDC/NCHS and CMS (the quoted conventions: Sections I.A.10–13, I.A.17, I.B.2, I.B.7, I.B.13)
Code titles, child codes and annotations are reproduced from the FY2027 ICD-10-CM release. This page is a reference, not coding or medical advice.
Last reviewed: October 1, 2026