H.R.5711: To amend part B of title XVIII of the Social Security Act to establish a floor for payment for mammography under the Medicare Program.

Assure Access to Mammography Act of 2008 - Amends part B (Supplementary Medical Insurance) of title XVIII (Medicare) of the Social Security Act to establish a floor for payment of screening and diagnostic mammography under the Medicare Program.

Sets the payment floor for 2009 at 115% of the fee scheduled amount for mammography for 2008, increased by the percentage increase in the Medicare Economic Index (MEI). Requires the payment floor for subsequent years to be the previous year's amount, again increased by the percentage increase in the MEI.