ICD-10 Code for Alzheimer's Disease
The ICD-10-CM code for alzheimer's disease is G30.9 — Alzheimer's disease, unspecified. It is billable for FY2027.
Alzheimer's disease ICD-10 codes at a glance
| Condition | Alzheimer's disease |
|---|---|
| Code | G30.9 — Alzheimer's disease, unspecified |
| Billable | Yes (G30.9) |
| Alphabetic Index entry | Disease, diseased, Alzheimer's |
| Code set | ICD-10-CM FY2027, valid October 1, 2026 – September 30, 2027 |
What changes the alzheimer's disease code?
The Alphabetic Index lists these qualifiers under Disease, diseased, Alzheimer's. If the record documents one of them, the code changes. Verify the code in the Tabular List before reporting it.
| with behavioral disturbance | G30.9 | Alzheimer's disease, unspecified |
| with behavioral disturbance | F02.81- | Dementia in other diseases classified elsewhere, unspecified severity, with behavioral disturbance |
| early onset | G30.0 | Alzheimer's disease with early onset |
| early onset | F02.80 | Dementia in other diseases classified elsewhere, unspecified severity, without behavioral disturbance, psychotic disturbance, mood disturbance, and anxiety |
| early onset › with behavioral disturbance | G30.0 | Alzheimer's disease with early onset |
| early onset › with behavioral disturbance | F02.81- | Dementia in other diseases classified elsewhere, unspecified severity, with behavioral disturbance |
| late onset | G30.1 | Alzheimer's disease with late onset |
| late onset | F02.80 | Dementia in other diseases classified elsewhere, unspecified severity, without behavioral disturbance, psychotic disturbance, mood disturbance, and anxiety |
| late onset › with behavioral disturbance | G30.1 | Alzheimer's disease with late onset |
| late onset › with behavioral disturbance | F02.81- | Dementia in other diseases classified elsewhere, unspecified severity, with behavioral disturbance |
| specified NEC | G30.8 | Other Alzheimer's disease |
| specified NEC | F02.80 | Dementia in other diseases classified elsewhere, unspecified severity, without behavioral disturbance, psychotic disturbance, mood disturbance, and anxiety |
| specified NEC › with behavioral disturbance | G30.8 | Other Alzheimer's disease |
| specified NEC › with behavioral disturbance | F02.81- | Dementia in other diseases classified elsewhere, unspecified severity, with behavioral disturbance |
What else changes the alzheimer's disease code?
G30 codes the disease itself, split by onset: early (G30.0), late (G30.1), other (G30.8) or unspecified (G30.9). When the record also documents dementia, an additional code from F02.8- identifies its severity and any behavioral, psychotic, mood or anxiety features — G30 alone does not carry that detail.
What does the Tabular List say about G30.9?
The instructional notes that govern G30.9, including those it inherits from its category and chapter. An Excludes1 note means the two codes are never reported together.
Excludes1 — never code together — inherited from G30
The conditions below can never be reported together with G30.9 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
Use additional code — inherited from G30
Report an additional code alongside G30.9 to fully describe the condition. G30.9 is sequenced first.
- 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-)
Excludes2 — not included here — inherited from Chapter 6
The conditions below are not part of G30.9, but a patient may have both at the same time. When documentation supports it, G30.9 and the excluded code may both be reported.
- certain conditions originating in the perinatal period (P04-P96)
- certain infectious and parasitic diseases (A00-B99)
- complications of pregnancy, childbirth and the puerperium (O00-O9A)
- congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
- endocrine, nutritional and metabolic diseases (E00-E88)
- injury, poisoning and certain other consequences of external causes (S00-T88)
- neoplasms (C00-D49)
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
Codes, descriptions and Index entries are from the official ICD-10-CM FY2027 release. Guideline text is quoted from the ICD-10-CM Official Guidelines for Coding and Reporting FY 2027. A code must always be verified in the Tabular List before it is reported. Data sources