“…Most nationwide studies of the role of EHRs in improving quality of care, whether in terms of processes of care (McCullough et al 2010;Miller and Tucker 2011;Appari, Johnson, and Anthony 2013;McCullough, Parente, and Town 2013) or outcomes for patients (Miller and Tucker 2011;McCullough, Parente, and Town 2013;Agha 2014), have focused on EHR use by hospitals. Several studies have examined the impact of physician use of interoperable EHRs and electronic health information exchange, usually in one community or region of the United States (Frisse et al 2012;Kaushal, Edwards, and Kern 2015;Vest et al 2015), and a few recent studies have examined the relationship between health IT use in ambulatory care settings, including EHR use and disease registries, and ACSC admissions (Han et al 2014;O'Malley, Reschovsky, and Saiontz-Martinez 2015).…”