In October 2013, the OIG issued a report (“The First Level of the Medicare Appeals Process, 2008–2012: Volume, Outcomes, and Timeliness") that addresses the first level of the appeals process for Medicare Parts A and B, known as redetermination. Eighteen contractors that process redeterminations and relevant CMS staff were contacted for the study, which focused on redeterminations and claims processed for Medicare Parts A and B between 2008 and 2012. The report found that the number of redeterminations processed increased by 33% over this period, with those relating to Part A (especially those involving inpatient hospital and home health claims) increasing more rapidly than those relating to Part B. The growth in the recovery audit contractor program accounted for a large part of the appealed Part A decisions. Nevertheless, 80% of all redeterminations in 2012 involved Part B services, with contractors deciding more often in favor of Part B appellants than Part A appellants. Part A reviews were reported to be typically more time and resource intensive than those for Part B. The report also found that contractors generally met required timeframes for processing redeterminations and paying for appeals won by appellants, and when there were problems in this regard they most often related to Part A related cases rather than Part B. Contractors did, however, more often fail to transfer case files for second-level appeals in a timely manner. The report includes the following three recommendations for CMS, with which the agency concurred: (1) using the Medicare Appeals System (MAS) implemented by CMS for first-level appeals to monitor contractor performance, (2) continuing to foster information sharing among Medicare contractors, and (3) monitoring the quality of redeterminations data in the MAS.