Public insurance substituting for private insurance: new evidence regarding public hospitals, uncompensated care funds, and Medicaid.

This paper examines the impact of public health insurance programs, whether structured as subsidies to health care providers (public hospitals and uncompensated care reimbursement funds) or as direct insurance (Medicaid), on the purchase of private health insurance. The presence of a public hospital is associated with a lower likelihood of private insurance for those with incomes between 100-200% and 200-400% of the poverty level. Uncompensated care reimbursement funds were associated with less purchase of private health insurance and a higher likelihood of being uninsured across all income groups. More generous Medicaid programs showed both safety-net and crowd out effects.