title: Can we trust population surveys to count Medicaid enrollees and the uninsured?
abstract: Health foundations, such as the Robert Wood Johnson Foundation (RWJF), make multimillion-dollar investments in programs to expand insurance coverage. These efforts are driven largely by estimates of the number of uninsured people derived from population surveys, which might overestimate the number of uninsured people if they under-count people enrolled in Medicaid. This paper reports the results of the RWJF-funded California Medicaid Undercount Experiment (CMUE) to estimate the extent of underreporting of Medicaid in the California Health Interview Survey (CHIS) and its effect on estimates of uninsurance. Although some over- and underreporting occurs, overall CHIS Medicaid estimates match administrative counts for adults.
authors.affiliation: University of California, Los Angeles (UCLA), Center forHealth PolicyResearch, USA. jkinchel@ucla.edu
authors.forename: Jennifer
authors.initials: J
authors.lastname: Kincheloe
authors.forename: E Richard
authors.initials: ER
authors.lastname: Brown
authors.forename: Janice
authors.initials: J
authors.lastname: Frates
authors.forename: Kathleen Thiede
authors.initials: KT
authors.lastname: Call
authors.forename: Wei
authors.initials: W
authors.lastname: Yen
authors.forename: Jim
authors.initials: J
authors.lastname: Watkins
mesh_terms: D000293:Adolescent; D000328:Adult; D002140:California; D005260:Female; D005582:Foundations; D006297:Health Services Accessibility; D006306:Health Surveys; D006801:Humans; D019458:Insurance Coverage / Q000706:statistics & numerical data; D008297:Male; D008484:Medicaid / Q000191:economics / Q000706:statistics & numerical data*; D017057:Medically Uninsured / Q000523:psychology / Q000706:statistics & numerical data; D008875:Middle Aged; D011159:Population Surveillance / Q000379:methods*