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PrefaceThe Centers for Medicare & Medicaid Services (CMS) uses the resource-based relative value system to determine payment for physicians and nonphysician practitioners for their professional services. For many surgeries and other types of procedures, Medicare payment also includes a bundle of pre-and post-operative visits delivered during a global period of 10 days or 90 days anchored on the surgery date. As part of the Medicare Access and CHIP Reauthorization Act of 2015, Congress mandated that CMS collect data on the "number and level" of visits in the global period from a representative sample of physicians beginning January 1, 2017. In order to support CMS in collecting data on the number and level of visits performed in the global period, the RAND Corporation had developed a set of nonpayment G-codes to capture setting, complexity, and time associated with post-operative visits in the global period (Mehrotra et al., 2016). In the 2017 Medicare physician fee schedule proposed rule, CMS proposed collection of data on postoperative visits using G-codes similar to those developed by RAND.