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Issues in Estimating the Coverage and Cost Impacts of Public Insurance Expansion. John Holahan November 10, 2004. Establishing the Baseline. Eligibility – State-specific rules applied to Current Population Survey Enrollment – CPS, as adjusted for Medicaid undercount
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Issues in Estimating the Coverage and Cost Impacts of Public Insurance Expansion John Holahan November 10, 2004
Establishing the Baseline • Eligibility – State-specific rules applied to Current Population Survey • Enrollment – CPS, as adjusted for Medicaid undercount • Issues – how much of an undercount, how to adjust • Need to Grow the Baseline to Reflect Current Law and Current Economy • Eligibility – did rules change? • Enrollment – estimate effect of rules change on enrollment – estimate effect of demographic or economic change
Need to Organize Population by Important Variables • Key demographics – children, parents, childless adults; income • Current coverage – employer sponsored, non group, Medicaid/SCHIP, other government, uninsured • Current eligibility for public coverage • Need to separate from those currently ineligible
Take Up Rates – How will Behavior Change in Response to New Policy • Uninsured – previously ineligible – use take-up models to estimate share of new eligibles that would enroll • Previously eligible • Non Group – previously ineligible • Previously eligible • ESI – employer dropping • Firm drops • Firm continues to offer – employee dropping • Use crowd out literature
Other Issues • Behavioral responses • To premiums – participation and price elasticity literature • To different benefit packages • To higher provider payments, access • To reduced stigma • To firewalls
Cost Per Person • Medicaid cost per capita is high because of adverse selection and health status, broad benefits and low rates • Expansion population will likely be healthier; benefit package may be better, provider payment rates higher • Estimate equation to explain relationship between expenditures and health status, type of insurance coverage and other factors • Use health status coefficients to adjust Medicaid cost per enrollee • Adjust for administrative costs and inflation
Table 1Incremental Reform Alternative Options for Expanding Medicaid/SCHIP
Table 2Incremental ReformExpand Coverage to All Adults to 200% FPL
Table 3Incremental ReformExpand Coverage to All Adults to 200% FPL
Table 4Incremental ReformExpand Coverage to 200% FPL Effects by Income