EFFICIENCY Managed Care Health Plans: Potentially Inappropriate Imaging Studies for Low Back Pain, by Plan Type Percent of health plan members with a primary diagnosis of low back pain who received an imaging study within 28 days of the diagnosis* REPORT EXHIBIT Managed care plans (2009) Annual averages * Lower rate represents better performance. ^ Denotes years in 2006 and 2008 National Scorecards. Data: Healthcare Effectiveness Data and Information Set (NCQA 2010). Source: Commonwealth Fund National Scorecard on U.S. Health System Performance, 2011.