TY - JOUR T1 - Using Medicare claims in identifying Alzheimer's disease and related dementias. JF - Alzheimer's & Dementia Y1 - Forthcoming A1 - Jain, Siddharth A1 - Rosenbaum, Paul R A1 - Reiter, Joseph G A1 - Geoffrey J Hoffman A1 - Small, Dylan S A1 - Ha, Jinkyung A1 - Hill, Alexander S A1 - Wolk, David A A1 - Timothy G. Gaulton A1 - Mark D Neuman A1 - Roderic G Eckenhoff A1 - Fleisher, Lee A A1 - Jeffrey H Silber KW - administrative data KW - Alzheimer's disease KW - cognitive impairment KW - Dementia KW - Medicare AB -

INTRODUCTION: This study develops a measure of Alzheimer's disease and related dementias (ADRD) using Medicare claims.

METHODS: Validation resembles the approach of the American Psychological Association, including (1) content validity, (2) construct validity, and (3) predictive validity.

RESULTS: We found that four items-a Medicare claim recording ADRD 1 year ago, 2 years ago, 3 years ago, and a total stay of 6 months in a nursing home-exhibit a pattern of association consistent with a single underlying ADRD construct, and presence of any two of these four items predict a direct measure of cognitive function and also future claims for ADRD.

DISCUSSION: Our four items are internally consistent with the measurement of a single quantity. The presence of any two items do a better job than a single claim when predicting both a direct measure of cognitive function and future ADRD claims.

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