{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,11,12]],"date-time":"2026-11-12T08:10:20Z","timestamp":1794471020711,"version":"4.9.1"},"reference-count":34,"publisher":"BMJ","issue":"2","license":[{"start":{"date-parts":[[2024,2,15]],"date-time":"2024-02-15T00:00:00Z","timestamp":1707955200000},"content-version":"unspecified","delay-in-days":14,"URL":"http:\/\/creativecommons.org\/licenses\/by-nc\/4.0\/"}],"funder":[{"name":"National Institute on Aging at the National Institutes of Health","award":["K23AG056638, R01AG083370"],"award-info":[{"award-number":["K23AG056638, R01AG083370"]}]}],"content-domain":{"domain":["bmj.com"],"crossmark-restriction":true},"short-container-title":["BMJ Open"],"accepted":{"date-parts":[[2024,1,31]]},"published-print":{"date-parts":[[2024,2]]},"abstract":"<jats:sec>\n                    <jats:title>Objective<\/jats:title>\n                    <jats:p>Map multimorbidity-weighted index (MWI) conditions to International Classification of Diseases, 10th Revision (ICD-10), expand the conditions and codes to develop a new ICD-10-coded MWI (MWI-ICD10) and updated MWI-ICD9, and assess their consistency.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Design<\/jats:title>\n                    <jats:p>Population-based retrospective cohort.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Setting<\/jats:title>\n                    <jats:p>Large medical centre between 2013 and 2017.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Participants<\/jats:title>\n                    <jats:p>Adults \u226518 years old with encounters in each of 4 years (2013, 2014, 2016, 2017).<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Main outcome measures<\/jats:title>\n                    <jats:p>MWI conditions mapped to ICD-10 codes, and additional conditions and codes added to produce a new MWI-ICD10 and updated MWI-ICD9. We compared the prevalence of ICD-coded MWI conditions within the ICD-9 era (2013\u20132014), within the ICD-10 era (2016\u20132017) and across the ICD-9\u2013ICD-10 transition in 2015 (washout period) among adults present in both sets of comparison years. We computed the prevalence and change in prevalence of conditions when using MWI-ICD10 versus MWI-ICD9.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>88\u2009175 adults met inclusion criteria. Participants were 60.8% female, 50.5% white, with mean age 54.7\u00b117.3 years and baseline MWI-ICD9 4.47\u00b16.02 (range 0\u201364.33). Of 94 conditions, 65 had &lt;1% difference across the ICD-9\u2013ICD-10 transition and similar minimal changes within ICD coding eras.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>MWI-ICD10 captured the prevalence of chronic conditions nearly identically to that of the validated MWI-ICD9, along with notable but explicable changes across the ICD-10 transition. This new comprehensive person-centred index enables quantification of cumulative disease burden and physical functioning in adults as a clinically meaningful measure of multimorbidity in electronic health record and claims data.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1136\/bmjopen-2023-074390","type":"journal-article","created":{"date-parts":[[2024,2,16]],"date-time":"2024-02-16T00:25:15Z","timestamp":1708043115000},"page":"e074390","update-policy":"https:\/\/doi.org\/10.1136\/crossmarkpolicy","source":"Crossref","is-referenced-by-count":11,"title":["Development and validation of new multimorbidity-weighted index for ICD-10-coded electronic health record and claims data: an observational study"],"prefix":"10.1136","volume":"14","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-5093-6040","authenticated-orcid":false,"given":"Melissa Y","family":"Wei","sequence":"first","affiliation":[{"name":"Department of Internal Medicine, University of California Los Angeles, Los Angeles, California, USA"},{"name":"VA Greater Los Angeles Healthcare System, Los Angeles, California, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Aleda M","family":"Leis","sequence":"additional","affiliation":[{"name":"Department of Epidemiology, University of Michigan School of Public Health, Ann Arbor, Michigan, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Arseniy","family":"Vasilyev","sequence":"additional","affiliation":[{"name":"Department of Internal Medicine, University of California Los Angeles, Los Angeles, California, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ashley J","family":"Kang","sequence":"additional","affiliation":[{"name":"Department of Internal Medicine, University of California Los Angeles, Los Angeles, California, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"239","published-online":{"date-parts":[[2024,2,15]]},"reference":[{"key":"2025121601593385000_14.2.e074390.1","doi-asserted-by":"crossref","DOI":"10.5888\/pcd12.140478","article-title":"Multimorbidity redefined: prospective health outcomes and the cumulative effect of co-occurring conditions","volume":"12","author":"Koroukian","year":"2015","journal-title":"Prev Chronic Dis"},{"key":"2025121601593385000_14.2.e074390.2","unstructured":"World Health Organization . 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