TABLE 1.
ICD‐9 and ICD‐10 codes used for identifying Alzheimer's disease and related dementia in administrative databases
| ICD‐9 | Definition | ICD‐10 | Definition |
|---|---|---|---|
| 331.0 | Alzheimer's disease | G30.0 | Alzheimer's disease with early onset |
| G30.1 | Alzheimer's disease with late onset | ||
| G30.9 | Alzheimer's disease, unspecified | ||
| ICD‐9 | Definition | ICD‐10 | Definition |
| 290 | Senile dementia, uncomplicated | G30.8 | Other Alzheimer's disease |
| 290.0 | Senile dementia, uncomplicated | F01 | Vascular dementia |
| 290.1 | Presenile dementia (brain syndrome w/presenile dementia) | F01.5 | Vascular dementia |
| 290.10 | Presenile dementia, uncomplicated | F01.50 | Vascular dementia without behavioral disturbance |
| 290.11 | Presenile dementia with delirium | F01.51 | Vascular dementia with behavioral disturbance |
| 290.12 | Presenile dementia with delusional features | F02 | Dementia in other diseases classified elsewhere |
| 290.13 | Presenile dementia with depressive features | F02.8 | Dementia in other diseases classified elsewhere |
| 290.2 | Senile dementia with delusional features | F02.80 | Dementia in other diseases classified elsewhere w/out behavioral disturbance |
| 290.20 | Senile dementia with delusional features | F02.81 | Dementia in other diseases classified elsewhere with behavioral disturbance |
| 290.21 | Senile dementia with depressive features | F03 | Unspecified dementia |
| 290.3 | Senile dementia with delirium | F03.9 | Unspecified dementia |
| 290.4 | Vascular dementia, uncomplicated | F03.90 | Unspecified dementia without behavioral disturbance |
| 290.40 | Vascular dementia, uncomplicated | F03.91 | Unspecified dementia with behavioral disturbance |
| 290.42 | Vascular dementia, with delusions | F10.27 | Alcohol dependence with alcohol‐induced persisting dementia |
| 290.43 | Vascular dementia, with depressed mood | F19.97 | Other psychoactive substance use, unspecified with persisting dementia |
| 291.2 | Alcohol‐induced persisting dementia | G10 | Huntington's dementia |
| 292.82 | Drug‐induced persisting dementia | G31.0 | Frontotemporal dementia |
| 294.0 | Amnestic syndrome | G31.01 | Pick's disease |
| 294.1 | Dementia in conditions classified elsewhere w/out behavioral disturbance | G31.09 | Other frontotemporal dementia |
| 294.10 | Dementia in conditions classified elsewhere | G31.83 | Dementia with Lewy bodies |
| 294.2 | Dementia, unspecified, without behavioral disturbance | ||
| 294.21 | Dementia, unspecified, with behavioral disturbance | ||
| 294.8 | Other specified organ brain syndrome (chronic) | ||
| 331 | Other cerebral degeneration | ||
| 331.2 | Senile degeneration of the brain | ||
| 331.82 | Dementia with Lewy bodies | ||
| ‘797’ | Senility without mention of psychosis |
Abbreviation: ICD, International Classification of Diseases.