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Methadone, one of three medications approved for opioid use disorder (OUD) treatment, was not covered by Medicare\u2014the primary insurer of Americans 65 years and older\u2014for OUD until 2020. We study the response of opioid treatment programs (OTPs), the only healthcare providers that can dispense methadone for the treatment of OUD in the United States, to this policy change using administrative data and a difference\u2010in\u2010differences framework. We find an increase in Medicare acceptance by OTPs and in the number of methadone treatment episodes post\u2010policy. Further, we document spillovers to other insurance markets and changes in (non\u2010methadone) treatment services offered by OTPs, suggesting that Medicare's entrance into this market has implications for all OUD patients receiving methadone treatment in OTPs.<\/jats:p>","DOI":"10.1002\/pam.70106","type":"journal-article","created":{"date-parts":[[2026,5,6]],"date-time":"2026-05-06T06:26:14Z","timestamp":1778048774000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Insurance Coverage and Provision of Opioid Disorder Treatment: Evidence From Medicare"],"prefix":"10.1002","volume":"45","author":[{"given":"Denis","family":"Agniel","sequence":"first","affiliation":[{"name":"RAND  Santa Monica California USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jonathan","family":"Cantor","sequence":"additional","affiliation":[{"name":"RAND  Santa Monica California USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Johanna Catherine","family":"Maclean","sequence":"additional","affiliation":[{"name":"Schar School of Policy and Government George Mason University, NBER &amp; IZA  Arlington Virginia USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Erin A.","family":"Taylor","sequence":"additional","affiliation":[{"name":"RAND  Santa Monica California USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kosali","family":"Simon","sequence":"additional","affiliation":[{"name":"O'Neill School of Public and Environmental Affairs Indiana University &amp; NBER  Bloomington Indiana USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2026,5,5]]},"reference":[{"key":"e_1_2_11_2_1","doi-asserted-by":"publisher","DOI":"10.1111\/1475-6773.13113"},{"key":"e_1_2_11_3_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.josat.2023.209247"},{"key":"e_1_2_11_4_1","unstructured":"Alderks C. 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