Objective: To examine whether miscarriage treatment-related morbidities and adverse events vary across facility types. Methods: A retrospective cohort study compared miscarriage treatmentrelated morbidities and adverse events across hospitals, ambulatory surgery centers (ASCs), and office-based settings. Data on women who had miscarriage treatment between 2011-2014 and were continuously enrolled in their insurance plan for at least one year prior to and at least six weeks after treatment were obtained from a large national private insurance claims database. The main outcome was miscarriage treatment-related morbidities and adverse events occurring within six-weeks of miscarriage treatment. Secondary outcomes were major events and infections. Results: 97,374 miscarriage treatments met inclusion criteria. Most (75%) were provided in hospitals, 10% ASCs, and 15% office-based settings. 9.3% had miscarriage treatment-related events, 1.0% major events, and 1.5% infections. In adjusted analyses, there were fewer events in ASCs (6.5%) than office-based settings (9.4%) and hospitals (9.6%), but no significant difference between office-based settings and hospitals. There were no significant differences in major events between ASCs (0.7%) and office-based settings (0.8%), but more in hospitals (1.1%) than ASCs and office-based settings. There were fewer infections in ASCs (0.9%) than office-based settings (1.2%) and more in hospitals (1.6%) than ASCs and office-based settings. In analyses stratified by miscarriage treatment type, the difference 45 46 3 between ASCs and office-based settings was no longer significant for miscarriages treated with procedures. Conclusions: While there appear to be slightly more events in hospitals than ASCs or office-based settings, findings do not support limiting miscarriage treatment to particular settings.