A bill to temporarily increase the Federal medical assistance percentage for the medicaid program.

Declares that, if the Federal medical assistance percentage (FMAP) under title XIX (Medicaid) of the Social Security Act (SSA) for a State for FY 2003 is less than the FMAP for FY 2002, the FY 2002 FMAP shall be substituted for the State's FMAP for the third and fourth calendar quarters of FY 2003. Declares similarly that if a State's FY 2004 FMAP is less than the FY 2003 FMAP, the FY 2003 FMAP shall be substituted for each calendar quarter of FY 2004.

Requires each eligible State for the third and fourth calendar quarters of FY 2003 and each calendar quarter of FY 2004 to have its FMAP increased by 2.45 percentage points. Mandates a specified Medicaid payment cap increase for territories. Prohibits application of the FMAP increases for a State under this Act with respect to: (1) disproportionate share hospital payments under Medicaid; and (2) payments under SSA titles IV and XXI (State Children's Health Insurance) (SCHIP).

Amends SSA title XX (Block Grants to States for Social Services), for the purpose of providing State fiscal relief allotments to States and territories in accordance with a specified table, to make appropriations to be available for obligation by the State through June 30, 2005, and for expenditure by the State through September 30, 2005.

Directs the Comptroller General to study and report to the Congress on the most appropriate data and methodology to use to determine the Federal medical assistance percentage for purposes of programs authorized under the Social Security Act.