If you will be having joint replacement surgery in the near future, chances are that you may have heard about the Comprehensive Care for Joint Replacement Model, commonly abbreviated as CCJR or CJR. This initiative, which was rolled out by the Centers for Medicare & Medicaid Services (CMS) as of April 1, 2016, mandates the participation of acute care hospitals in 67 metropolitan statistical areas (MSAs) in a bundled payment program for hip and knee replacement procedures.