Cite as: 512 U. S. 504 (1994)
Opinion of the Court
Likewise, contrary to the dissent's suggestion, post, at 520-522, the mere fact that in 1974 a fiscal intermediary may have allowed reimbursement to petitioner for GME costs that appear to have violated the anti-redistribution clause does not render the Secretary's interpretation of that clause invalid. For even if petitioner could show that such allowance was approved by—or even brought to the attention of— the Secretary or her designate at the time, "[t]he Secretary is not estopped from changing a view she believes to have been grounded upon a mistaken legal interpretation." Good Samaritan Hospital v. Shalala, 508 U. S. 402, 417 (1993). And under the circumstances of this case, "where the agency's interpretation of [its regulation] is at least as plausible as competing ones, there is little, if any, reason not to defer to its construction." Id., at 417.
Finally, petitioner contends that we should ignore the Secretary's interpretation of the anti-redistribution clause because the language of the regulation is "precatory" and "aspirational" in nature, and thus lacking in operative force. See Brief for Petitioner 31-32. We do not lightly assume that a regulation setting forth specific limitations on the reimbursement of costs under a federal program is devoid of substantive effect. That is especially so when, as here, the language in question speaks not in vague generalities but in precise terms about the conditions under which reimbursement is, and is not, available. Whatever vagueness may be found in the community support language that precedes it, the anti-redistribution clause lays down a bright line for distinguishing permissible from impermissible reimbursement: Educational costs will not be reimbursed if they are the result of a "redistribution of costs from educational institutions or units to patient care institutions or units." § 413.85(c). The Secretary was well within her discretion to interpret this language as imposing a substantive limitation on reimbursement.
517
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