{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,16]],"date-time":"2026-10-16T01:25:46Z","timestamp":1792113946880,"version":"4.4.0"},"reference-count":50,"publisher":"Wiley","issue":"1","license":[{"start":{"date-parts":[[2024,9,10]],"date-time":"2024-09-10T00:00:00Z","timestamp":1725926400000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by-nc-nd\/4.0\/"}],"funder":[{"DOI":"10.13039\/100000050","name":"National Heart, Lung, and Blood Institute","doi-asserted-by":"publisher","award":["1R01HL153179\u201001A1"],"award-info":[{"award-number":["1R01HL153179\u201001A1"]}],"id":[{"id":"10.13039\/100000050","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Health Services Research"],"published-print":{"date-parts":[[2025,2]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:sec><jats:title>Objective<\/jats:title><jats:p>To develop a method of consistently identifying interfacility transfers (IFTs) in Medicare Claims using patients with ST\u2010Elevation Myocardial Infarction (STEMI) as an example.<\/jats:p><\/jats:sec><jats:sec><jats:title>Data Sources\/Study Setting<\/jats:title><jats:p>100% Medicare inpatient and outpatient Standard Analytic Files and 5% Carrier Files, 2011\u20132020.<\/jats:p><\/jats:sec><jats:sec><jats:title>Study Design<\/jats:title><jats:p>Observational, cross\u2010sectional comparison of patient characteristics between proposed and existing methods.<\/jats:p><\/jats:sec><jats:sec><jats:title>Data Collection\/Extraction Methods<\/jats:title><jats:p>We limited to patients aged 65+ with STEMI diagnosis using both proposed and existing methods.<\/jats:p><\/jats:sec><jats:sec><jats:title>Principal Findings<\/jats:title><jats:p>We identified 62,668 more IFTs using the proposed method (86,128 versus 23,460). A separately billable interfacility ambulance trip was found for more IFTs using the proposed than existing method (86% vs. 79%). Compared with the existing method, transferred patients under the proposed method were more likely to live in rural (<jats:italic>p<\/jats:italic>\u2009&lt;\u20090.001) and lower income (<jats:italic>p<\/jats:italic>\u2009&lt;\u20090.001) counties and were located farther away from emergency departments, trauma centers, and intensive care units (<jats:italic>p<\/jats:italic>\u2009&lt;\u20090.001).<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>Identifying transferred patients based on two consecutive inpatient claims results in an undercount of IFTs and under\u2010represents rural and low\u2010income patients.<\/jats:p><\/jats:sec>","DOI":"10.1111\/1475-6773.14367","type":"journal-article","created":{"date-parts":[[2024,9,11]],"date-time":"2024-09-11T03:33:40Z","timestamp":1726025620000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["A proposed method for identifying Interfacility 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