Table used by the Centers for Medicare and Medicaid Services (CMS) to compute and update the indexes for most facilities. It takes into consideration three elements: a set of input categories (labor, supplies, purchased services); a set of price proxies that represent price levels for the input categories; and a fixed set of weights (proportions) that represent the importance of each input category in providers’ input expenditures for the base year. The formula is to take the actual or projected values of the price proxies for a year, multiply them by the category weights, and total them to get the overall market basket index value for the year. For physicians’ office practices, see Medicare Economic Index (MEI) .