The Institute of Medicine (IOM) released a report (Variation in Health Care Spending: Target Decision Making, Not Geography), which examined regional differences in health care spending, utilization and quality. The report also explored whether certain payment methods should be changed to address the regional variations.
Read full report: http://www.iom.edu/Reports/2013/Variation-in-Health-Care-Spending-Target-Decision-Making-Not-Geography.aspx