Simplifying children's Medicaid and SCHIP.

The states have implemented the State Children's Health Insurance Program (SCHIP) in a variety of ways. We describe these choices and estimate the resulting enrollment impacts. Many widely adopted policies, including mail-in applications and twelve-month continuous eligibility, have had limited impacts. Other policies that increase enrollment, including presumptive eligibility and self-declaration of income, have not been widely adopted. SCHIP programs administered as Medicaid expansions have been more successful in enrolling children than either separate SCHIP plans or combination programs. Waiting periods, premiums, and welfare reform have had important negative impacts on children's program enrollment.