Argued March 23, 1984 Decided May 10, 1984 Appeal from the Appellate Division of the Supreme Court in the Third Judicial Department, Aaron E. Klein, J. Thomas F. Gleason and Cornelius D. Murray for appellant. Robert Abrams, Attorney-General ( Alan W. Rubenstein and Peter H. Schiff of counsel), for respondents. MEYER, J. The overpayment of Medicaid reimbursement paid to a residential health care facility as a result of computer error in fixing the rate of reimbursement may be recovered by the State