410
Opinion of the Court
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." Petitioners argue that the mandate is clear: The methods for determining reasonable costs having been determined pursuant to § 1395x(v)(1)(A), clause (ii) must be read to mean that such methods nonetheless might yield "inadequate or excessive" amounts in any particular instance. Where such is the case, it is submitted, the clause mandates a correction that will provide full reimbursement for reasonable costs.
In contrast, the Secretary asserts that the "aggregate reimbursement" refers to the sum total of the interim payments made pursuant to § 1395g. These payments are, of course, based on the methods chosen by the Secretary to determine reasonable costs, but they are only anticipatory estimates of what the providers' reimbursable costs will be, made before all relevant data are available. At year's end, when the provider's reimbursable costs for services actually provided during that year are on hand, the preaudit "aggregate" of the interim payments can be compared to the post-audit amounts due under the methods. Because the interim payments might have been erroneously calculated, their total might not match amounts owed, and adjustments must be performed to reconcile the two. See 42 CFR §§ 413.64(e), (f) (1992).
In our view, the language of clause (ii) does not itself clearly settle the issue before us. The clause is ambiguous in two respects. First, the "aggregate reimbursement produced by the methods of determining costs" could mean either (in petitioners' view) the amount due given proper application of the Secretary's regulations, or (in the Secretary's view) the total of the interim payments, themselves derived from application of the methods to rough, incomplete data. Second, the clause refers to "inadequate" and "excessive" reimbursements, but without at any point stating the
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