RT Journal A1 Cheung PT, Wiler JL, Ginde AA T1 CHanges in barriers to primary care and emergency department utilization JF Archives of Internal Medicine JO Archives of Internal Medicine YR 2011 FD August 8 VO 171 IS 15 SP 1393 OP 1400 DO 10.1001/archinternmed.2011.350 UL http://dx.doi.org/10.1001/archinternmed.2011.350 AB The 2010 Patient Protection and Affordable Care Act1 (ACA) aimed to expand health insurance coverage, improve access to medical care, and control health care costs.2 An implicit goal of health insurance expansion is to improve access and utilization of primary care services and divert patients from what is believed to be higher-cost emergency care. Indeed, annual emergency department (ED) visit rates have increased from 90 million in 1996 to 124 million in 2008.3