Journal
HEALTH SERVICES RESEARCH
Volume 48, Issue 2, Pages 652-664Publisher
WILEY
DOI: 10.1111/j.1475-6773.2012.01446.x
Keywords
Medicaid undercount; validation study; survey and administrative data; uninsurance; health insurance coverage
Funding
- Robert Wood Johnson Foundation [052084]
- Office of the Assistant Secretary for Planning and Evaluation (ASPE)
- Centers for Medicare and Medicare Services (CMS)
- National Center for Health Statistics (NCHS)
- U.S. Census Bureau
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Objective To synthesize evidence on the accuracy of Medicaid reporting across state and federal surveys. Data Sources All available validation studies. Study Design Compare results from existing research to understand variation in reporting across surveys. Data Collection Methods Synthesize all available studies validating survey reports of Medicaid coverage. Principal Findings Across all surveys, reporting some type of insurance coverage is better than reporting Medicaid specifically. Therefore, estimates of uninsurance are less biased than estimates of specific sources of coverage. The CPS stands out as being particularly inaccurate. Conclusions Measuring health insurance coverage is prone to some level of error, yet survey overstatements of uninsurance are modest in most surveys. Accounting for all forms of bias is complex. Researchers should consider adjusting estimates of Medicaid and uninsurance in surveys prone to high levels of misreporting.
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