Throughout this report, AABD receipt is used as a proxy variable for SSI receipt. The table below presents the published numbers of children receiving SSI in the state of Illinois in December of each year. The measure in December represents the midpoint of each fiscal year. The AABD figures map nicely to the midpoints even during the period of rapid growth beginning in 1992.
Number of Children in Illinois Receiving: December
Supplemental Security Income (SSI) 12,951 15,387 21,178 31,874 41,225 July 1, 1989
June 30, 1990
July 1, 1990
June 30, 1991
July 1, 1991
June 30, 1992
July 1, 1992
June 30, 1993
July 1, 1993
June 30, 1994
Aid to the Aged, Blind, and Disabled (AABD) 12,184 14,839 19,986 33,555 43,941 SOURCE: Social Security Bulletin, Annual Statistical Supplement, 1989-1993
An error was found in the diagnosis field of our medical claims database for services received January 1993-June 1995. The error involved only institutional claims made during the time period, thus we did not expect our diagnosis code selection to be substantially affected. In order to measure the error introduced, we compared the number of children that we identified as disabled using all claims versus all non-institutional claims in fiscal year 1990. We found that using all types of claims in the diagnosis code selection gave us 42,147 Medicaid program participants versus 34,541 using only non-institutional claim records. This represents 82% of the total Medicaid population available to us if the diagnosis code of all claim records could have been used.
The population incidence of 8% is based on 3,338,418 children living in Illinois according to the 1990 U.S. Census.