The Supplemental Security Income (SSI) program (also known as Title XVI), which became
effective January 1, 1974, replaced the State administered Titles I, X, XIV, and XVI
(aid to the blind and disabled) which formed the basis for State Buy-In coverage groups
between 7 /1/1966 and 12/31/1973. The federally administered Title XVI (SSI) is effective
in the District of Columbia, the Northern Mariana Islands and the 50 States. The State-administered
Titles I, X and XIV remain in effect in Puerto Rico, Guam and the Virgin Islands.