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Most states can expect a dip in their federal match rate for Medicaid in fiscal year 2013, according to a new report from the National Association of Medicaid Directors.

Twenty-four states will see a loss of half a percentage point or more, says the report, titled “FY 2013 Federal Medical Assistance Percentages; Decennial Census Data Affect the Flow of Medicaid Funds.” The federal medical assistance percentage (FMAP) rate reflects personal income shifts from state-to-state, as well as the impact of data from the 2010 census.

The rate, which is calculated yearly by the Centers for Medicare & Medicaid Services, is based on each state’s average per capita personal income over the most recent three calendar years, compared with the national average, and population as determined by the decennial census, according to the report.

To read the full report, click here.