Source: U.S. Bureau of Economic Analysis  

Release: Personal Income and Outlays  

Units:  Billions of Dollars, Seasonally Adjusted Annual Rate

Frequency:  Monthly

BEA Account Code: W824RC
Medicare benefits include hospital and supplementary medical insurance benefits that are distributed from the federal hospital insurance trust fund and the supplementary medical insurance trust fund.
A Guide to the National Income and Product Accounts of the United States (NIPA) - (http://www.bea.gov/national/pdf/nipaguid.pdf)