Appeal from an order and judgment of the Supreme Court at Special Term (Bryant, J.), entered February 13,1981 in Tioga County, which, inter alia, granted plaintiff’s motion for partial summary judgment. Plaintiff is a corporation organized under the Not-For-Profit Corporation Law and article 28-A of the Public Health Law to operate a not-for-profit nursing home. Among the patients cared for by plaintiff are persons eligible to receive public assistance pursuant to subchapter 19 of the Federal Social Security Act (US Code, tit 42, § 1396 et seq.) and the New York State Plan for Medical Assistance (Medicaid) (Social Services Law, §§ 363-369). Plaintiff is reimbursed for services rendered to eligible patients according to rates periodically established by the New York State Department of Health and approved by the Director of the Budget pursuant to section 2807 of the Public Health Law. These rates are generally established prospectively by obtaining actual costs incurred by a facility for the period starting two years before the year for which rates are to be set and adjusting such costs for inflation. However, where a facility has not been in operation long enough to have a sufficient cost experience, its reimbursement rates are calculated on an alternate basis provided for in such cases (10 NYCRR 86.19, now 86-1.19). For 1974, the year in question, defendant New York State Commissioner of Health (commissioner) determined that plaintiff did not have adequate cost experience upon which to base its rates. Accordingly, plaintiff’s reimbursement rates were calculated pursuant to 10 NYCRR 86.19. Specifically, defendants obtained plaintiff’s projected budgeted expenditures for 1973 and multiplied these figures by an inflation, or “trend” factor, to arrive at plaintiff’s 1974 reimbursement rates. Plaintiff was thereafter reimbursed at those rates for 1974. In 1976, plaintiff was informed that its 1974 reimbursement rates were to be revised downward based upon an audit of its 1972 expenses. And, by letter dated August 27,1979, plaintiff was advised that the revision of its 1974 rates
