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Historically, census figures are significantly higher than the "uninsured" count in other government surveys, such as the Survey of Income and Program Participation (SIPP) and the Medical Expenditure Panel Survey (MEPS).3 The inaccuracy of the census count of the uninsured may be due, in part, to its undercount of Medicaid enrollments. In 2003, 53 million persons were enrolled in Medicaid but the census reported only 35.6 million enrollees. Medicaid enrollments have expanded dramatically in recent years but the census figures have failed to reflect this increase.

http://www.heritage.org/Research/Re...-and-Economic-Inequality-in-the-United-States
In 2003 I see a difference of roughly 20,000 thousand. That looks like 20,000,000 to me, unless my math is wrong.