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Data included semi\u2010structured key informant interviews conducted in 2018\u20132019 (<jats:italic>n<\/jats:italic>\u2009=\u2009221) and 2021 (<jats:italic>n<\/jats:italic>\u2009=\u2009167); pilot\u2010level surveys; whole\u2010network surveys of 507 organizations in all 25 pilots participating in WPC; and documents submitted by pilots to the state. Pilots served a total of 247,887 unique members between 2017 and 2021, the majority of whom were non\u2010white (72%) and over half of whom experienced homelessness.<\/jats:p><\/jats:sec><jats:sec><jats:title>Study Design\/Data Collection<\/jats:title><jats:p>Data were collected as part of the statewide evaluation of WPC. We analyzed qualitative data to examine strategies used by pilots to integrate care, network data to identify pilots that improved cross\u2010sector collaboration (i.e., strengthened density or multiplexity of cross\u2010sector ties) following WPC implementation, and comparative case analysis to identify strategies that differentiated pilots that improved collaboration from those that did not.<\/jats:p><\/jats:sec><jats:sec><jats:title>Principal Findings<\/jats:title><jats:p>Pilots used multiple strategies to facilitate the integration of care. Network analyses identified 10 pilots that significantly improved either density or multiplexity of cross\u2010sector ties, and one pilot with high cross\u2010sector collaboration prior to WPC. Compared to pilots that did not improve cross\u2010sector collaboration, these pilots meaningfully engaged partners in program design and implementation, used braided funds, and leveraged WPC to support broader systems change. These pilots also reported fewer challenges in developing and managing contractual relationships and ensuring meaningful use of data\u2010sharing infrastructure by frontline staff responsible for care coordination.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>Data sharing is necessary but not sufficient for systems alignment. Collaboration strategies focused on addressing financial barriers to integration and strengthening normative and interpersonal integration are also needed.<\/jats:p><\/jats:sec>","DOI":"10.1111\/1475-6773.14417","type":"journal-article","created":{"date-parts":[[2024,12,5]],"date-time":"2024-12-05T02:10:49Z","timestamp":1733364649000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Collaboration strategies for bridging health, behavioral health, and social services in California's Medi\u2010Cal Whole Person Care Pilot Program"],"prefix":"10.1111","volume":"60","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-9227-3273","authenticated-orcid":false,"given":"Emmeline","family":"Chuang","sequence":"first","affiliation":[{"name":"School of Social Welfare University of California Berkeley  Berkeley California 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