Cite as: 508 U. S. 402 (1993)
Opinion of the Court
necessary adjustments on account of previously made overpayments or underpayments." 42 U. S. C. § 1395g(a). These interim payments by definition are only approximate ones, based on the provider's preaudit, estimated costs of anticipated services. See 42 CFR §§ 413.64(e), (f) (1992). Second, the regulations were required to "provide for the making of suitable retroactive corrective adjustments where, for a provider of services for any fiscal period, the aggregate reimbursement produced by the methods of determining costs proves to be either inadequate or excessive." 42 U. S. C. § 1395x(v)(1)(A)(ii) (clause (ii)).
B
Petitioners are six Nebraska hospitals certified as "providers" of health care services and classified as "rural" for Medicare purposes. Between 1980 and 1984, their costs exceeded the corresponding cost limits. Pursuant to 42 U. S. C. § 1395oo, they filed an appeal to the Provider Reimbursement Review Board (PRRB) in which they challenged the validity of the applicable cost limits on two grounds. First, they claimed that the wage index that was used to calculate reasonable cost of labor did not account for the use of part-time employees. Because petitioners used a greater proportion of part-time employees than the national average, this had the effect of artificially lowering their index values. In support of their claim, they pointed to Congress' decision in 1983 ordering the Secretary to conduct a wage index study to consider the distortion due to part-time employment, Medicare and Medicaid Budget Reconciliation Amendments of 1984, Pub. L. 98-369, § 2316(a), 98 Stat. 1081, followed by the Secretary's own revision of the wage index in 1986 which accounted for part-time employees, 51 Fed. Reg. 16772 (1986), and to Congress' directive that the revised index be applied to discharges occurring after May 1, 1986, Medicare and Medicaid Budget Reconciliation Amendments of 1985, Pub. L. 99-272, § 9103(a), 100 Stat. 156. Second,
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