States known as “1634” states are states that have completed a “1634 agreement” with the Social Security Administration. This agreement determines eligibility for a specific state’s Medicaid program for Supplemental Security Income (SSI) recipients. This is known as categorical eligibility. The agreements are only with states that use Supplemental Security Income (SSI) criteria to determine Medicaid eligibility. In other words, individuals who receive Supplemental Security Income (SSI) in those states receive Medicaid automatically. Individuals do not need to apply for Medicaid benefits separately.

Not all states are “1634” states. Please see above for states that are known as “1634” states and those states that have medically needy programs for individuals who are aged, blind, and disabled.

Sources/Further Reading:
http://policy.ssa.gov/poms.nsf/lnx/0501715020
http://policy.ssa.gov/poms.nsf/lnx/0501715010
http://policy.ssa.gov/poms.nsf/lnx/0501730060
http://policy.ssa.gov/poms.nsf/lnx/0501730010
Image Courtesy: http://www.healthline.com/health-news/your-options-if-medicaid-goes-broke#1