The table below provides a side-by-side comparison of recent estimates of uninsurance from the National Center for Health Statistics' National Health Interview Survey (NHIS) and the U.
S. Census Bureau's Current Population Survey (CPS). These two surveys are pillars of the federal statistical community's measurement approach to health insurance coverage. However,the 2014 CPS is the first time that the Census Bureau has been able to utilize that survey to produce estimates of the percentage of persons who lacked health insurance coverage at the time of survey interview. In preceding years, CPS produced estimates only of the percentage of persons who lacked health insurance coverage for the entire preceding calendar year.
Source: cdc.gov