CMS has published a notice correcting technical errors in its November 14, 2016 final rule with comment period updating the Medicare hospital outpatient prospective payment system (OPPS) and ambulatory surgical center payment systems for 2017. Among many other things, CMS is correcting the OPPS weight scaler, which very slightly increases OPPS rates that are adjusted for budget neutrality. CMS has released updated addenda with the corrected payment rates.