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Multivariable difference\u2010in\u2010difference\u2010in\u2010differences models estimated the policy effect on the probability of experiencing delayed care (&gt;60 days) between diagnosis and initial surgery.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Among 71,135 women, 12% had Medicaid coverage. Women treated in postpolicy years (<jats:italic>p<\/jats:italic>\u00a0&lt;\u00a0.001 relative to prepolicy) and Medicaid beneficiaries (<jats:italic>p<\/jats:italic>\u00a0&lt;\u00a0.001 relative to non\u2010Medicaid patients) were more likely to experience delayed care. Non\u2010Medicaid beneficiaries had a 12.6% probability of delayed care postpolicy (compared to 8.8% prepolicy), whereas Medicaid beneficiaries had a 21% probability of delayed care postpolicy (compared to 14.5% prepolicy). Although these increases were not statistically different between the Medicaid and non\u2010Medicaid groups as a whole, which indicates no overall policy effect, Medicaid beneficiaries in nonurban areas were more likely to experience delayed care after the policy implementation (<jats:italic>p<\/jats:italic>\u00a0=\u00a0.04).<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>Regionalization of breast cancer care in New York did not lead to a significant overall decrease in access to timely surgical care. Regionalization of care may be a promising approach to improving breast cancer outcomes. However, the potential impact on nonurban and other vulnerable populations must be carefully considered to prevent exacerbating disparities in access to care.<\/jats:p><\/jats:sec>","DOI":"10.1002\/cncr.35895","type":"journal-article","created":{"date-parts":[[2025,5,19]],"date-time":"2025-05-19T10:41:01Z","timestamp":1747651261000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Does regionalization of initial breast cancer care delay time to surgery?"],"prefix":"10.1002","volume":"131","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-7210-4333","authenticated-orcid":false,"given":"Tina W. 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