State Medicaid Assistance Extension Act of 2009

State Medicaid Assistance Extension Act of 2009 - Amends the American Recovery and Reinvestment Act of 2009 to extend for one year the period of temporary increase in the Medicaid federal medical assistance percentage (FMAP) under title XIX (Medicaid) of the Social Security Act. Extends the entire recession adjustment period from December 31, 2010, through December 31, 2011.

Requires the substitution for the FMAP for the first calendar quarter in FY2012 of the FMAP for either FY2008, FY2009, FY2010, or FY2011, as adjusted under ARRA, whichever is greatest, if the FY2012 FMAP is less than any of them.