According to a recent study

89% of participating emergency department clinicians said that having access to a health information exchange (HIE) improved the quality of patient care, and 82% said that access to the HIE saved time, with a mean time savings of 105 minutes per patient Source: "Health Information Exchange Saves $1 Million in Emergency Care Costs for Medicare," American College of Emergency Physicians Press Release, October 14, 2013, http://newsroom.acep.org/2013-10-14-Health-Information-Exchange-Saves-1-Million-in-Emergency-Care-Costs-for-Medicare