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The ACA expansions may have affected maternal morbidity by increasing pre\u2010conception access to health care, and by improving the quality of delivery care, through enhancing hospitals' financial positions. We use difference\u2010in\u2010difference models in conjunction with event studies. Data come from individual\u2010level birth certificates and state\u2010level hospital discharge data. The results show little evidence that the expansions are associated with overall maternal morbidity or indicators of specific adverse events including eclampsia, ruptured uterus, and unplanned hysterectomy. The results are consistent with prior research showing that the ACA Medicaid expansions are not statistically associated with pre\u2010pregnancy health or maternal health during pregnancy. Our results add to this story and find little evidence of improvements in maternal health upon delivery.<\/jats:p>","DOI":"10.1002\/hec.4724","type":"journal-article","created":{"date-parts":[[2023,7,7]],"date-time":"2023-07-07T09:52:56Z","timestamp":1688723576000},"page":"2334-2352","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":8,"title":["Affordable Care Act Medicaid expansions and maternal morbidity"],"prefix":"10.1002","volume":"32","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-7752-2438","authenticated-orcid":false,"given":"Pinka","family":"Chatterji","sequence":"first","affiliation":[{"name":"Department of Economics University at Albany and NBER  Albany New York USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hanna","family":"Glenn","sequence":"additional","affiliation":[{"name":"Department of Economics Emory University  Atlanta Georgia USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3892-2145","authenticated-orcid":false,"given":"Sara","family":"Markowitz","sequence":"additional","affiliation":[{"name":"Department of Economics Emory University and NBER  Atlanta Georgia USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jennifer Karas","family":"Montez","sequence":"additional","affiliation":[{"name":"Sociology Department Syracuse University  Syracuse New York USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2023,7,7]]},"reference":[{"key":"e_1_2_11_2_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1751\u2010486x.2011.01613.x"},{"key":"e_1_2_11_3_1","doi-asserted-by":"publisher","DOI":"10.1377\/hlthaff.2021.01150"},{"key":"e_1_2_11_4_1","doi-asserted-by":"publisher","DOI":"10.1377\/hlthaff.2020.00502"},{"key":"e_1_2_11_5_1","volume-title":"Report from nine maternal mortality review committees","author":"Building U.S","year":"2018"},{"key":"e_1_2_11_6_1","doi-asserted-by":"publisher","DOI":"10.1111\/1475\u20106773.12702"},{"key":"e_1_2_11_7_1","unstructured":"Center for Disease Control and Prevention. 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