The Social Security Administration (SSA) administers two programs that provide benefits based on disability: the Social Security disability insurance program (title II of the Social Security Act (Act)) and the Supplemental Security Income (SSI) program (title XVI of the Act). Title II provides for payment of disability benefits to disabled individuals who are “insured” under the Act by virtue of their contributions to the Social Security trust fund through the Social Security tax on their earnings, as well as to certain disabled dependents of insured individuals.