"Medicare Part B covers drugs typically administered by a physician. Medicare pays physicians and other providers for these drugs at an amount generally equal to the ASP of the drug plus a fixed percentage. These payment rates are calculated quarterly by CMS based on price and volume data reported by drug manufacturers. Members of Congress and others have questioned the amount that both Medicare and its beneficiaries spend on Part B drugs.GAO was asked to examine Medicare spending for and utilization of Part B drugs and the accuracy of the sales price data reported by drug manufacturers. This report (1) describes Medicare spending and utilization for Part B drugs that are paid based on ASP, including variations in spending and utilization by provider and drug characteristics, and (2) examines the steps CMS takes to ensure the accuracy of the sales price data reported by drug manufacturers. To describe Medicare spending and utilization for Part B ASP drugs, GAO analyzed 2014 Medicare claims data. To examine the accuracy of ASP data, GAO interviewed CMS, the HHS Office of Inspector General, and drug manufacturers and reviewed related documentation."