96
Opinion of the Court
ment organizations (which have developed such principles) in computing the amount of payment . . . to providers of services." 42 U. S. C. § 1395x(v)(1)(A).
Nor is there any basis for suggesting that the Secretary has a statutory duty to promulgate regulations that, either by default rule or by specification, address every conceivable question in the process of determining equitable reimbursement. To the extent the Medicare statute's broad delegation of authority imposes a rulemaking obligation, see ibid., it is one the Secretary has without doubt discharged. See Good Samaritan Hospital v. Shalala, 508 U. S., at 418, and n. 13, 419, n. 15. The Secretary has issued regulations to address a wide range of reimbursement questions. The regulations are comprehensive and intricate in detail, addressing matters such as limits on cost reimbursement, apportioning costs to Medicare services, and the specific treatment of numerous particular costs. As of 1994, these regulations consumed some 640 pages of the Code of Federal Regulations.
As to particular reimbursement details not addressed by her regulations, the Secretary relies upon an elaborate adjudicative structure which includes the right to review by the Provider Reimbursement Review Board, and, in some instances, the Secretary, as well as judicial review in federal district court of final agency action. 42 U. S. C. § 1395oo(f)(1); see Bethesda Hospital Assn. v. Bowen, 485 U. S. 399, 400-401 (1988). That her regulations do not resolve the specific timing question before us in a conclusive way, or "could use a more exact mode of calculating," does not, of course, render them invalid, for the "methods for the estimation of reasonable costs" required by the statute only need be "generalizations [that] necessarily will fail to yield exact numbers." Good Samaritan, supra, at 418. The APA does not require that all the specific applications of a rule evolve by further, more precise rules rather than by adjudication. See NLRB v. Bell Aerospace Co., 416 U. S. 267
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