Whether the Medicare Act's authorization for “suitable retroactive corrective adjustments” permitted the Secretary to reissue a generally applicable cost-limit rule retroactively.
Holding
No. The corrective-adjustment provision authorizes case-by-case reimbursement adjustments for individual providers; it does not authorize retroactive legislative rulemaking.
Reasoning
The Court began with the principle that an agency has only the regulatory authority Congress has delegated. Because retroactivity is disfavored, a statutory grant of rulemaking authority ordinarily does not include power to issue retroactive rules unless Congress conveys that power expressly.
The text and structure of 42 U.S.C. § 1395x(v)(1)(A)(ii) point to individualized adjustments, not revisions of a generally applicable cost methodology. The provision refers to correcting the aggregate reimbursement paid to “a provider” when the methods of determining costs have yielded an excessive or inadequate result. By contrast, the surrounding provisions establish cost-determination methods for providers generally.
A corrective adjustment presupposes that the existing reimbursement method has been applied and that an individual provider's total reimbursement can then be reconciled with its actual reasonable costs. The Secretary's 1984 action did something different: it altered one of the methods for calculating costs itself, then applied that new method to an earlier period.
The Secretary's own longstanding regulations confirmed this narrower reading. They treated retroactive corrective adjustments as year-end reconciliations between a provider's interim payments and its actual reimbursable costs. The 1984 rule was not issued as such an adjustment, and the Secretary invoked this theory only in litigation.
The Court declined to defer to the Secretary's litigation position. That interpretation was unsupported by prior regulations, rulings, or administrative practice and contradicted the Secretary's earlier position that the provision merely allowed year-end balancing for individual providers. Deference belongs to an agency's reasoned and adopted interpretation, not to appellate counsel's post hoc rationale.