• Christopher P Scally, Terry Shih, Jyothi R Thumma, and Justin B Dimick.
• Department of Surgery, Center for Healthcare Outcomes and Policy, University of Michigan, Ann Arbor, MI, USA. cscally@med.umich.edu.
• J. Gastrointest. Surg. 2016 Apr 1; 20 (4): 708-14.

IntroductionIn 2006, the Centers for Medicare and Medicaid Services (CMS) issued a national coverage decision restricting bariatric surgery to designated centers of excellence (COE). Although prior studies show mixed results on complications and reoperations, no prior studies evaluated whether this policy reduced spending for bariatric surgery. We sought to determine whether the coverage restriction to COE-designated hospitals was associated with lower payments from CMS.MethodsWe utilized national Medicare claims data to examine 30-day episode payments for patients who underwent bariatric surgery from 2003 to 2010 (n = 72,117 patients). We performed an interrupted time series analysis, adjusting for patient factors, preexisting temporal trends, and changes in procedure type, to determine whether the 2006 coverage decision was associated with lower Medicare payments above and beyond any existing secular trends. For these analyses, we included payments for the index hospitalization, readmissions, physician services, and post-discharge ancillary care.ResultsAfter accounting for patient factors, preexisting temporal trends, and changes in procedure type, there were no statistically significant improvements in episode payments after (US$14,720) vs before (US$14,283) the coverage decision (+US$437, 95% CI, -US$10 to +US$883). In a direct assessment of payments for COE-designated hospitals (US$14,481) vs. non-COE-designated hospitals (US$14,756), no significant differences in episode payments were found (-US$275, 95% CI, -US$696 to +US$145).ConclusionsWe found no significant reductions in 30-day episode payments after vs before restricting coverage to COE-designated hospitals. Center of excellence status is not a proxy for savings to the healthcare system.

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