{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,17]],"date-time":"2026-10-17T13:04:57Z","timestamp":1792242297325,"version":"4.4.0"},"reference-count":36,"publisher":"Oxford University Press (OUP)","issue":"10","license":[{"start":{"date-parts":[[2026,8,24]],"date-time":"2026-08-24T00:00:00Z","timestamp":1787529600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by-nc-nd\/4.0\/"}],"funder":[{"DOI":"10.13039\/100000049","name":"National Institute on Aging","doi-asserted-by":"publisher","award":["P30AG066582"],"award-info":[{"award-number":["P30AG066582"]}],"id":[{"id":"10.13039\/100000049","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100000049","name":"National Institute on Aging","doi-asserted-by":"publisher","award":["R01AG079226"],"award-info":[{"award-number":["R01AG079226"]}],"id":[{"id":"10.13039\/100000049","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100000049","name":"National Institute on Aging","doi-asserted-by":"publisher","award":["R01AG017917"],"award-info":[{"award-number":["R01AG017917"]}],"id":[{"id":"10.13039\/100000049","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100000049","name":"National Institute on Aging","doi-asserted-by":"publisher","award":["R01AG022018"],"award-info":[{"award-number":["R01AG022018"]}],"id":[{"id":"10.13039\/100000049","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100000049","name":"National Institute on Aging","doi-asserted-by":"publisher","award":["P30AG10161"],"award-info":[{"award-number":["P30AG10161"]}],"id":[{"id":"10.13039\/100000049","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100000049","name":"National Institute on Aging","doi-asserted-by":"publisher","award":["P30AG072975"],"award-info":[{"award-number":["P30AG072975"]}],"id":[{"id":"10.13039\/100000049","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2026,9,5]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:sec>\n                    <jats:title>Background<\/jats:title>\n                    <jats:p>Rapid growth in Medicare Advantage (MA) enrollment has spurred dementia research using diagnoses in MA encounter data. However, the validity of MA-encounter-based dementia diagnoses is uncertain.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>Using four cohort studies at the Rush Alzheimer\u2019s Disease Center linked to Medicare data from 2017\u201319, we validated prevalent dementia indicators in MA encounter data, based on the Bynum-Standard algorithm, against dementia status determined by rigorous cognitive assessment in the cohort studies. We replicated analyses among participants in Traditional Medicare (TM).<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>Of the 508 eligible MA enrollees, mean age was 82.8 (SD\u2009=\u20097.2) years, 81% were female, and 49% were non-Latino White; 62 participants (12%) were classified as having dementia by the cohort assessment. MA-encounter-based dementia indicators performed reasonably well in identifying participants with cohort-assessed dementia: using encounters alone, positive predictive value was 63% (95% CI: 52%-75%), negative predictive value was 96% (95% CI: 94%-98%), and accuracy was 92% (95% CI: 89%-94%). Inclusion of chart reviews did not impact performance. Compared to TM-based indicators during the same period, MA-based indicators yielded similar validity metrics but identified a less functionally impaired group as having dementia. In secondary validation analysis of mild cognitive impairment (MCI), sensitivity was low.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>As one of the first studies to validate dementia diagnoses in MA encounter data, indicators based on the Bynum-Standard algorithm can be a valid tool for identifying prevalent dementia. Findings support the use of MA-encounter-based dementia indicators for research within MA. However, observed health differences between MA- and TM-identified dementia groups suggest potential for selection bias in MA plans.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1093\/gerona\/glag206","type":"journal-article","created":{"date-parts":[[2026,8,24]],"date-time":"2026-08-24T11:24:59Z","timestamp":1787570699000},"source":"Crossref","is-referenced-by-count":1,"title":["Identification of prevalent dementia in Medicare Advantage encounters, compared with rigorous cohort assessments"],"prefix":"10.1093","volume":"81","author":[{"ORCID":"https:\/\/orcid.org\/0009-0005-1045-0501","authenticated-orcid":false,"given":"Yi","family":"Chen","sequence":"first","affiliation":[{"name":"Rush Alzheimer\u2019s Disease Center, Rush University Medical Center , Chicago, Illinois,","place":["United States"]},{"name":"Department of Internal Medicine, Rush University Medical Center , Chicago, Illinois,","place":["United 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