Opinion of the Court
changed a “substantive legal standard.” That phrase doesn’t seem to appear anywhere else in the entire United States Code, and the parties offer at least two ways to read it.
The hospitals suggest the statute means to distinguish a substantive from a procedural legal standard. On this account, a substantive standard is one that “creates duties, rights and obligations,” while a procedural standard specifies how those duties, rights, and obligations should be enforced. Black’s Law Dictionary 1281 (5th ed. 1979) (defining “substantive law”). And everyone agrees that a policy of counting Part C patients in the Medicare fraction is substantive in this sense, because it affects a hospital’s right to payment. From this it follows that the public had a right to notice and comment before the government could adopt the policy at hand. 863 F. 3d, at 943.
Very differently, the government suggests the statute means to distinguish a substantive from an interpretive legal standard. Under the APA, “substantive rules” are those that have the “force and effect of law,” while “interpretive rules” are those that merely “ ‘advise the public of the agency’s construction of the statutes and rules which it administers.’ ” Perez v. Mortgage Bankers Assn., 575 U. S. 92, ___–___ (2015) (slip op., at 2–3). On the government’s view, the 1987 Medicare notice-and-comment statute meant to track the APA’s usage in this respect. And the government submits that, because the policy of counting Part C patients in the Medicare fractions would be treated as interpretive rather than substantive under the APA, it had no statutory obligation to provide notice and comment before adopting its new policy.
Who has the better reading? Several statutory clues persuade us of at least one thing: The government’s interpretation can’t be right. Pretty clearly, the Medicare Act doesn’t use the word “substantive” in the same way the APA does—to identify only those legal standards that
