414
Opinion of the Court
of amounts due under the regulations with "reasonable" costs as demonstrated by the provider. Cf. id., at 209, n. 1.
III
A
Confronted with an ambiguous statutory provision, we generally will defer to a permissible interpretation espoused by the agency entrusted with its implementation. See National Railroad Passenger Corporation v. Boston & Maine Corp., 503 U. S. 407, 417 (1992); Department of Treasury, IRS v. FLRA, 494 U. S. 922, 933 (1990); K mart Corp. v. Car-tier, Inc., 486 U. S. 281, 291-292 (1988). Of particular relevance is the agency's contemporaneous construction which "we have allowed . . . to carry the day against doubts that might exist from a reading of the bare words of a statute." FHA v. The Darlington, Inc., 358 U. S. 84, 90 (1958). See also Aluminum Co. of America v. Central Lincoln Peoples' Utility Dist., 467 U. S. 380, 390 (1984).
In this case, the regulatory framework put in place by the agency in furtherance of the Medicare program supports the book-balancing approach to clause (ii). Nowhere in the regulations was there mention of a mechanism for implementing the kind of substantive recalculation and deviation from approved methods suggested by petitioners. On the other hand, the regulations provided on more than one occasion for the year-end book-balancing adjustment that, in the Secretary's opinion, is mandated by clause (ii). For instance, 20 CFR § 405.451(b)(1) (1967) stated:
"These regulations also provide for the making of suitable retroactive adjustments after the provider has submitted fiscal and statistical reports. The retroactive adjustment will represent the difference between the amount received by the provider during the year . . . and the amount determined in accordance with an accepted method of cost apportionment to be the actual
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