Children's Hosp. of the King's Daughters, Inc. v. Azar , 896 F.3d 615 ( 2018 )


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  •                                     PUBLISHED
    UNITED STATES COURT OF APPEALS
    FOR THE FOURTH CIRCUIT
    No. 17-2237
    CHILDREN’S HOSPITAL OF THE KING’S DAUGHTERS, INC.,
    Plaintiff - Appellee,
    v.
    ALEX M. AZAR II, in his official capacity, Secretary, Department of Health and
    Human Services; SEEMA VERMA, in her official capacity, Administrator,
    Centers for Medicare & Medicaid Services; CENTERS FOR MEDICARE AND
    MEDICAID SERVICES,
    Defendants - Appellants.
    Appeal from the United States District Court for the Eastern District of Virginia, at
    Norfolk. Rebecca Beach Smith, Chief District Judge. (2:17-cv-00139-RBS-LRL)
    Argued: May 9, 2018                                           Decided: July 23, 2018
    Before TRAXLER, AGEE, and WYNN, Circuit Judges.
    Affirmed in part and vacated in part by published opinion. Judge Wynn wrote the
    opinion, in which Judge Traxler and Judge Agee concurred.
    ARGUED: Samantha L. Chaifetz, UNITED STATES DEPARTMENT OF JUSTICE,
    Washington, D.C., for Appellants. Geraldine E. Edens, MORGAN, LEWIS &
    BOCKIUS LLP, Washington, D.C.; Christopher Howard Marraro, BAKER &
    HOSTETLER, LLP, Washington, D.C., for Appellee. ON BRIEF: Chad A. Readler,
    Acting Assistant Attorney General, Mark B. Stern, Tara S. Morrissey, Civil Division,
    UNITED STATES DEPARTMENT OF JUSTICE, Washington, D.C.; Dana J. Boente,
    United States Attorney, OFFICE OF THE UNITED STATES ATTORNEY, Alexandria,
    Virginia; Brian R. Stimson, Acting General Counsel, Janice L. Hoffman, Associate
    General Counsel, Susan M. Lyons, Deputy Associate General Counsel for Litigation,
    David L. Hoskins, Lindsay S. Goldberg, Office of the General Counsel, Centers for
    Medicare & Medicaid Services Division, UNITED STATES DEPARTMENT OF
    HEALTH AND HUMAN SERVICES, Washington, D.C., for Appellants. Susan Feigin
    Harris, MORGAN, LEWIS & BOCKIUS LLP, Houston, Texas, for Appellee.
    2
    WYNN, Circuit Judge:
    Defendant-Appellant Alex Azar, in his official capacity as Secretary of the U.S.
    Department of Health & Human Services (the “Secretary”), appeals an order of the U.S.
    District Court for the Eastern District of Virginia enjoining the Secretary from enforcing
    a Medicaid policy set forth in a Frequently Asked Questions document (“FAQ 33”). See
    Children’s Hosp. of the King’s Daughters, Inc. v. Price, 
    258 F. Supp. 3d 672
    (E.D. Va.
    2017). The FAQ 33 policy purported to clarify the methodology for calculating the
    maximum amount of financial assistance available to hospitals, like Plaintiff-Appellee
    Children’s Hospital of the King’s Daughters, Inc. (“Children’s Hospital”), that serve a
    disproportionate number of low-income or special needs patients (commonly referred to
    as “disproportionate share hospitals” or “DSHs”). Under the methodology in FAQ 33,
    Children’s Hospital would have to repay $19.1 million in DSH payments it received from
    the Medicaid program.
    The district court enjoined the Secretary from enforcing the FAQ 33 policy against
    Children’s Hospital for two reasons: (1) the promulgation of the FAQ 33 policy failed to
    comply with the procedural requirements set forth in the Administrative Procedural Act
    (“APA”) and (2) the FAQ 33 policy contradicted the plain and unambiguous language of
    the governing statute.
    For the reasons that follow, we conclude that the district court correctly
    determined that the policy set forth in FAQ 33 constituted a “legislative rule” and,
    therefore, that the APA mandated that the agency establish the FAQ 33 policy through
    notice-and-comment rulemaking. See 5 U.S.C. § 553(a)–(c). We thus affirm the district
    3
    court’s judgment enjoining the Secretary from enforcing the policy set forth in FAQ 33
    against Children’s Hospital. Because we conclude that the policy violated the APA’s
    procedural requirements, we decline to reach the substantive challenge by Children’s
    Hospital to the FAQ 33 policy and vacate the part of the district court’s opinion
    addressing whether that policy conflicts with the language of 42 U.S.C. § 1396r-4(g).
    I.
    Medicaid, 42 U.S.C. § 1396 et seq., is a cooperative federal-state program through
    which the federal government provides financial assistance to state Medicaid programs,
    which in turn provide medical insurance to qualifying individuals. Children’s 
    Hosp., 258 F. Supp. 3d at 677
    .      Although states have some discretion in determining which
    individuals are qualified to participate in their Medicaid programs, the vast majority of
    beneficiaries qualify to participate because their “income and resources are insufficient to
    meet the costs of necessary medical services.”       42 U.S.C. § 1396-1.      Additionally,
    Medicaid programs “provide[] benefits to children with certain serious illnesses, without
    regard to their family’s income.” Children’s 
    Hosp., 258 F. Supp. 3d at 678
    (emphasis
    added) (citing §§ 1396a(cc), 1382(a)(3)(c)). Because their eligibility does not depend on
    income and resources, such Medicaid-eligible children often have private insurance
    coverage.
    Children’s Hospital is a non-profit pediatric hospital located in Norfolk, Virginia.
    Most of Children’s Hospital’s pediatric patients are eligible to participate in the Medicaid
    program, either because of their poverty or because they have a qualifying illness or
    disability. See 
    id. (noting that
    Children’s Hospital’s “Medicaid Inpatient Utilization
    4
    Ratio (‘MIUR’) (the ratio of Medicaid inpatient days to total hospital days) was 69.65%
    in 2012,” the highest MIUR in Virginia).
    The Medicaid statute provides for state Medicaid programs to make “payment
    adjustment[s]”     to   certain    hospitals,   like    Children’s Hospital, that      “serve    a
    disproportionate    number        of   low-income      patients   with   special   needs.”      §§
    1396a(a)(13)(A)(iv), 1396r-4(c). The statute further establishes an aggregate limit on the
    amount of payment adjustments state programs can allocate to all qualifying DSHs in
    their state. § 1396r-4(f)(3). In a provision titled “Amount of adjustment subject to
    uncompensated costs,” the statute also caps the amount of DSH funding any particular
    hospital may receive in a given year at:
    [T]he costs incurred during the year of furnishing hospital services (as
    determined by the Secretary and net of payments under this subchapter,
    other than under this section, and by uninsured patients) by the hospital to
    individuals who either are eligible for medical assistance under the State
    plan or have no health insurance (or other source of third party coverage)
    for services provided during the year. For purposes of the preceding
    sentence, payments made to a hospital for services provided to indigent
    patients made by a State or a unit of local government within a State shall
    not be considered to be a source of third party payment.
    § 1396r-4(g)(1)(A). In a 1994 guidance document, the agency characterized the “first
    part” of this hospital specific limit as the hospital’s “Medicaid ‘shortfall’”—“the cost of
    services furnished to Medicaid patients, less the amount paid under the non-DSH
    payment method under the State plan.” J.A. 172. “The second part of the formula is the
    cost of services provided to patients who have no health insurance or source of third party
    payment for services provided during the year, less the amount of payments made by
    these patients.” 
    Id. Together, these
    two parts of the hospital specific limit constitute a
    5
    DSH’s “uncompensated care costs.” See Medicaid Program; Disproportionate Share
    Hospital Payments, 73 Fed. Reg. 77,904, 77,904 (Dec. 19, 2008) (codified at 42 CFR pts.
    447 & 455).
    In a regulation promulgated in 2008 to implement new statutory DSH reporting
    and auditing requirements, the Centers for Medicare & Medicaid Services (“CMS”), a
    division of the Department of Health & Human Services, set forth the methodology for
    calculating the “payment adjustment.” 42 C.F.R. § 447.299. In particular, a section
    titled “Total annual uncompensated care costs” provides:
    The total annual uncompensated care cost equals the total cost of care for
    furnishing inpatient hospital and outpatient hospital services to Medicaid
    eligible individuals and to individuals with no source of third party
    coverage for the hospital services they receive less the sum of regular
    Medicaid [fee-for-service] rate payments, Medicaid managed care
    organization payments, supplemental/enhanced Medicaid payments,
    uninsured revenues, and Section 1011 payments for inpatient and outpatient
    hospital services. This should equal the sum of paragraphs (c)(9), (c)(12),
    and (c)(13) subtracted from the sum of paragraphs (c)(10) and (c)(14) of
    this section.
    § 447.299(c)(16). Of particular relevance to this appeal, Section 447.299(c)(10) defines
    the “Total Cost of Care for Medicaid [Inpatient/Outpatient] Services” as “The total
    annual costs incurred by each hospital for furnishing inpatient hospital and outpatient
    hospital services to Medicaid eligible individuals.” And Section 447.299(c)(9) defines
    “Total Medicaid [Inpatient/Outpatient] Payments” as the sum of Medicaid fee-for-service
    payments, Medicaid managed care payments, and supplemental Medicaid payments.
    The dispute between Children’s Hospital and the Secretary turns on whether
    payments by private insurance companies to Children’s Hospital on behalf of Medicaid-
    6
    eligible patients should be accounted for in determining Children’s Hospital DSH
    payment adjustment. In a Frequently Asked Questions document released in 2010, FAQ
    33, which was not promulgated through notice-and-comment rulemaking, CMS took the
    position that
    days, costs, and revenues associated with patients that are eligible for
    Medicaid and also have private insurance should be included in the
    calculation of the hospital-specific DSH limit. As Medicaid should be the
    payer of last resort, hospitals should also offset both Medicaid and third-
    party revenue associated with the Medicaid eligible day against the costs
    for that day to determine any uncompensated amount.
    Children’s 
    Hosp., 258 F. Supp. 3d at 679
    –80 (emphasis added). Until it understood FAQ
    33’s import in October 2016—as a result of an audit by an outside auditor working on
    behalf of Virginia’s Medicaid program—Children’s Hospital did not include payments
    from private insurers in calculating its payment adjustment. The auditor determined that
    Children’s Hospital was obliged to repay $19.1 million to the State Medicaid program as
    a result of DSH overpayments Children’s Hospital received because it failed to include
    private insurance payments in its payment adjustment calculation.
    On March 7, 2017, Children’s Hospital filed a complaint seeking declaratory and
    injunctive relief. Children’s Hospital sought a declaration that FAQ 33’s requirement
    that private insurance payments be included in calculating the payment adjustment is
    contrary to the plain and unambiguous language of Section 1396r-4(g)(1), and therefore
    is unlawful and must be vacated under the Administrative Procedure Act, 5 U.S.C. §
    706(2)(c). Alternatively, Children’s Hospital argued that the FAQ 33 policy constituted a
    substantive amendment to the calculation methodology set forth in the 2008 rule and
    7
    therefore that CMS unlawfully sought to effect a regulatory policy change without
    completing notice-and-comment rulemaking. Children’s Hospital sought an injunction
    barring the Secretary from enforcing FAQ 33’s policy of requiring inclusion of private
    insurance payments in calculating the payment adjustment.
    In an opinion and order entered June 20, 2017, the district court concluded that the
    FAQ 33 policy amounted to a substantive rule that should have been promulgated
    through notice-and-comment rulemaking and that the policy conflicted with the plain and
    unambiguous language of Section 1396r-4(g)(1). Children’s 
    Hosp., 258 F. Supp. 3d at 687
    , 689. The district court preliminarily enjoined the Secretary from enforcing the
    policy set forth in FAQ 33 against Children’s Hospital. 
    Id. at 692.
    At the request of the
    parties, the district court subsequently converted its preliminary injunction opinion and
    order into an award of summary judgment to Children’s Hospital and, therefore, an
    appealable final judgment. The Secretary timely appealed.
    II.
    On appeal, the Secretary makes two arguments: (1) that the FAQ 33 policy
    constitutes an “interpretative”—rather than “legislative”—rule and therefore need not
    have been the product of notice-and-comment rulemaking, and (2) that the policy set
    forth in FAQ 33 amounts to a reasonable administrative construction of the governing
    statutory language and therefore is entitled to judicial deference.     We review both
    questions de novo. Ray Commc’ns, Inc. v. Clear Channel Commc’ns, Inc., 
    673 F.3d 294
    ,
    297 (4th Cir. 2012) (reviewing de novo legal determinations underlying an award of
    summary judgment).
    8
    A.
    The APA requires that all “rules” be issued through a statutorily prescribed notice-
    and-comment process. See 5 U.S.C. § 553(a)–(c). “Rules issued through the notice-and-
    comment process are often referred to as ‘legislative rules’ because they have the ‘force
    and effect of law.’” Perez v. Mortg. Bankers Ass’n, 
    135 S. Ct. 1199
    , 1203 (2015)
    (quoting Chrysler Corp. v. Brown, 
    441 U.S. 281
    , 302–03 (1979)). By contrast, “the APA
    provides that, unless another statute states otherwise, the notice-and-comment
    requirement ‘does not apply’ to ‘interpretative rules, general statements of policy, or rules
    of agency organization, procedure, or practice.’” 
    Id. at 1203–04.
    (quoting § 553(b)(A)).
    According to Children’s Hospital, FAQ 33 amounts to a “legislative rule,” and
    therefore should have been issued through the notice-and-comment process prescribed in
    Section 553(a)–(c). On the other hand, the Secretary argues that the rule is “interpretive”
    and therefore did not need to go through the notice-and-comment process.
    The Supreme Court recently acknowledged that the “precise meaning” of the term
    “interpretive rule” in the APA “is the source of much scholarly and judicial debate,” and
    expressly declined to “wade into that debate.” 
    Id. at 1204;
    see also Am. Mining Cong. v.
    Mine Safety & Health Admin., 
    995 F.2d 1106
    , 1108–09 (D.C. Cir. 1993) (describing the
    distinction between interpretive and legislative rules as “enshrouded in considerable
    smog” (internal quotation marks omitted)); Jerri’s Ceramic Arts, Inc. v. Consumer Prod.
    Safety Comm’n, 
    874 F.2d 205
    , 207 (4th Cir. 1989) (recognizing that the “distinction
    between ‘interpretative’ rules and ‘something more,’ i.e., ‘substantive’ or ‘legislative’
    rules, is not always easily made”). Nonetheless, the Perez Court stated that “the critical
    9
    feature of interpretive rules is that they are ‘issued by an agency to advise the public of
    the agency’s construction of the statutes and rules which it administers.’” Perez, 135 S.
    Ct. at 1204 (quoting Shalala v. Guernsey Mem’l Hosp., 
    514 U.S. 87
    , 99 (1995)).
    This Court has recognized that “courts are in general agreement that interpretative
    rules simply state what the administrative agency thinks the statute means, and only
    ‘remind’ affected parties of existing duties.” 
    Jerri’s, 874 F.2d at 207
    . Put differently,
    “[a]n interpretive rule is merely a clarification or explanation of an existing statute or
    rule.” Chen Zhou Chai v. Carroll, 
    48 F.3d 1331
    , 1341 (4th Cir. 1995) (emphasis added)
    (quoting Guardian Fed. Sav. & Loan Ass’n v. Fed. Sav. & Loan Ins. Corp., 
    589 F.2d 658
    ,
    664 (D.C. Cir. 1978)); see also Mendoza v. Perez, 
    754 F.3d 1002
    , 1021 (D.C. Cir. 2014)
    (“Interpretative rules are those that clarify a statutory or regulatory term, remind parties
    of existing statutory duties, or merely track preexisting requirements and explain
    something the statute or regulation already required.” (internal quotation marks omitted)).
    By contrast, “a substantive or legislative rule, pursuant to properly delegated
    authority, has the force of law, and creates new law or imposes new rights or duties.”
    
    Jerri’s, 874 F.3d at 207
    (citations omitted). To that end, “[a] rule is legislative if it
    supplements a statute, adopts a new position inconsistent with existing regulations, or
    otherwise effects a substantive change in existing law or policy.” 
    Mendoza, 754 F.3d at 1021
    (citations omitted). Likewise, a rule is legislative if it “expand[s] the footprint of a
    regulation by imposing new requirements, rather than simply interpreting the legal norms
    Congress or the agency itself has previously created.” Iowa League of Cities v. E.P.A.,
    
    711 F.3d 844
    , 873 (8th Cir. 2013) (citations omitted).
    10
    We conclude that the policy set forth in FAQ 33 falls on the legislative end of the
    “spectrum,” N.H. Hosp. Ass’n v. Azar, 
    887 F.3d 62
    , 70 (1st Cir. 2018), because (1) the
    policy of requiring DSHs to account for private insurance payments in calculating a
    DSH’s uncompensated care costs does not derive from the statute or the 2008 rule and (2)
    the agency relied on—and continues to rely on—the Secretary’s statutorily delegated
    authority to “determine[]” what constitutes “costs incurred” for purposes of calculating a
    DSH’s payment adjustment as the legal basis supporting the policy. See 42 U.S.C. §
    1396r-4(g)(1)(A).
    As to the first reason—that the policy in FAQ 33 does not derive from the statute
    or 2008 rule—the statute provides that a qualifying hospital’s payment adjustment shall
    not exceed the hospital’s “costs incurred” in providing services to Medicaid-eligible and
    uninsured patients. 
    Id. The amount
    of “costs incurred” are to be “determined by the
    Secretary and net of payments [by Medicaid] and by uninsured patients.” 
    Id. Payments by
    private insurers are not, therefore, one of the two types of “payments” that the statute
    explicitly requires a DSH to “net” out in determining its “costs incurred.” Likewise, the
    2008 rule’s formula for calculating “total annual uncompensated care” expressly requires
    hospitals to subtract only Medicaid payments and payments by uninsured individuals. 42
    C.F.R. § 447.299(c)(16). Payments by private insurers, therefore, are not among the
    “payments” that the 2008 rule expressly requires DSHs to account for in determining
    their “total annual uncompensated care.”
    The Secretary concedes “[t]he regulatory formula does not specifically address
    payments by Medicare or private insurers, and offers no explicit instructions to States or
    11
    hospitals as to how to account for Medicaid-eligible patients who have additional
    insurance.” Appellant’s Br. 26. Nevertheless, the Secretary argues that the policy in
    FAQ 33 has its genesis in the 2008 rule and its preamble because those provisions
    characterize the calculation as determining a DSH’s “uncompensated care costs.” See 42
    C.F.R. § 447.299(c)(16) (emphasis added); 73 Fed. Reg. at 77,910-11. According to the
    Secretary, because care provided by a DSH that is reimbursed by a private insurer is
    “compensated,” the policy set forth in FAQ 33 derives from the 2008 rule and its
    preamble.
    We disagree. The calculation methodology in the rule itself does not mention—let
    alone     specifically   address—payments     by   private    insurers.   §   447.299(c)(16).
    Additionally, the preamble defines “uncompensated care costs” as “the costs incurred by
    that hospital in furnishing services during the year to Medicaid patients and the
    uninsured, less other Medicaid payments made to the hospital, and payments made by
    uninsured patients.” 73 Fed. Reg. at 77,904 (emphasis added). Again, that definition
    does not mention private insurance payments, and conspicuously omits payments by
    private insurers from the two types of “payments” that DSHs must deduct when
    calculating “uncompensated care costs.” And the preamble to the 2008 rule refers to data
    fields in a form for calculating and reporting “total uncompensated care costs.” 73 Fed.
    Reg. at 77,921. Once again, none of those data fields addresses payments by private
    insurers. 
    Id. The Secretary
    also emphasizes that the preamble to the 2008 rule directs DSHs to
    include     payments     by   Medicare   in   calculating    their   hospital-specific   limit,
    12
    notwithstanding that the statute does not explicitly address whether Medicare payments
    should be netted out. See 73 Fed. Reg. at 77,912. The Secretary maintains that this
    language indicated that CMS intended for non-Medicaid payments to be accounted for in
    calculating a DSH’s “costs incurred.” But again, neither that specific provision in the
    preamble nor the preamble in general mentions payments by private insurers, much less
    addresses whether such payments must be deducted. Accordingly, FAQ 33’s policy of
    requiring DSHs to deduct payments by private insurers in calculating their “costs
    incurred” does not derive “from an existing [statute or regulation] whose meaning
    compels or logically justifies the proposition,” thereby weighing in favor of treating the
    FAQ 33 policy as a legislative rule. 
    Mendoza, 754 F.3d at 1021
    (citation omitted).
    The second consideration supporting our conclusion that the policy in FAQ 33
    amounts to a legislative rule—that the agency relies on the Secretary’s statutorily
    delegated authority to “determine[]” what constitute “costs incurred” for purposes of
    calculating a DSH’s uncompensated care costs as the legal basis supporting the policy—
    is closely connected to the statute’s and 2008 rule’s silence as to whether DSHs must net
    out private insurance payments in calculating their “costs incurred.” As the First Circuit
    explained in concluding that FAQ 33 constituted a legislative rule, “[t]his textual silence
    on whether to offset [private insurance] payment[s] leads us to believe that any authority
    that the Secretary may have to adopt the rule at issue would most likely flow from
    Congress’s delegation of a power to make a decision that Congress chose not to make
    itself.” N.H. 
    Hosp., 887 F.3d at 71
    . The Secretary concedes as much, asserting that the
    13
    policy set forth in FAQ 33 reflects a “reasonable exercise of the Secretary’s expressly
    delegated authority to determine how to calculate ‘costs incurred.’” Appellant’s Br. 40.
    When an agency relies on expressly delegated authority to establish policy—as the
    Secretary does with regard to FAQ 33—courts generally treat the agency action as
    legislative, rather than interpretive, rulemaking. Iowa League of 
    Cities, 711 F.3d at 873
    (“When an agency creates a new ‘legal norm based on the agency’s own authority’ to
    engage in supplementary lawmaking, as delegated from Congress, the agency creates a
    legislative rule.” (quoting Syncor Int’l Corp. v. Shalala, 
    127 F.3d 90
    , 95 (D.C. Cir.
    1997))); Walton v. Greenbrier Ford, Inc., 
    370 F.3d 446
    , 452 (4th Cir. 2004) (“Legislative
    regulations are those in which ‘Congress has explicitly left a gap for the agency to fill,
    [thus] there is an express delegation of authority to the agency to elucidate the specific
    provision of the statute by regulation.’” (alteration in original) (quoting Chevron U.S.A.,
    Inc. v. NRDC, Inc., 
    467 U.S. 837
    , 843–44 (1984)). As the First Circuit correctly held
    with regard to the policy in FAQ 33, in particular, even if we were to “accept arguendo
    the Secretary’s stated position that Congress granted the Secretary the ‘latitude’ to decide
    what, if any, other sources of payments made in connection with Medicaid-covered costs
    need be offset from the total costs of providing such services, . . . when Congress leaves
    such a policy choice to the agency, we should lean toward finding that the agency’s
    making of that choice requires notice and comment.” N.H. 
    Hosp., 887 F.3d at 70
    –71
    (citations omitted). “Otherwise, it would be ‘difficult to imagine what regulations would
    require notice and comment procedures.’” Id. (quoting 
    Mendoza, 754 F.3d at 1021
    ). Put
    differently, even if Congress authorized the Secretary to require DSHs to account for
    14
    private insurance payments in exercising his statutorily delegated discretion to define
    “costs incurred,” the absence of statutory or regulatory language compelling—or even
    suggesting such a policy—required the agency to promulgate its FAQ 33 policy through
    notice-and-comment rulemaking.
    The statute’s and 2008 rule’s silence as to private insurance payments—and the
    Secretary’s reliance on his delegated authority to determine what constitute “costs
    incurred”—also sets this case apart from the principal case relied on by the Secretary,
    Shalala v. Guernsey Memorial Hospital, 
    514 U.S. 87
    (1995). Guernsey involved a
    provision in the Medicare statute that provides for hospital reimbursement based on
    “reasonable costs,” defined as the “costs actually incurred” for providing services to
    
    beneficiaries. 514 U.S. at 91
    (quoting 42 U.S.C. § 1395x(v)(1)(A)). The statute further
    authorized the Secretary to promulgate regulations establishing the methodology to be
    used for determining “reasonable costs,” directing the Secretary to “consider, among
    other things, the principles generally applied by national organizations.” 
    Id. (quoting 42
    U.S.C. § 1395x(v)(1)(A)). Pursuant to that authority, on an annual basis, the Secretary
    promulgated regulations establishing methods for determining reasonable cost
    reimbursement. 
    Id. at 92.
    Those regulations required hospitals to follow “[s]tandardized
    definitions, accounting, statistics, and reporting practices that are widely accepted in the
    hospital and related fields.” 
    Id. (quoting 42
    C.F.R. § 413.20(a)). After promulgating an
    annual regulation, the agency distributed an informal Medicare reimbursement
    guideline—which was not promulgated through notice-and-comment rulemaking—
    15
    stating that, in determining “reasonable costs” incurred, hospitals must amortize the cost
    of refinancing bonds over the life of the old bonds. 
    Id. at 90-91.
    Emphasizing that generally accepted accounting practices did not require
    amortizing the cost of the bond refinancing, the hospital argued that the amortization
    requirement was inconsistent with the regulation and therefore should have been
    promulgated through notice-and-comment rulemaking. The Supreme Court disagreed,
    concluding that the informal reimbursement guideline constituted a “prototypical”
    interpretive rule. 
    Id. at 99.
    In reaching this conclusion, the Court explained that the
    policy set forth in the guideline was required both by a statutory provision prohibiting the
    Medicare program from cross-subsidizing other health insurance programs and vice versa
    and by a regulation providing “that only the actual cost of services rendered to
    beneficiaries during a given year [could] be reimbursed.”            
    Id. (emphasis added).
    Accordingly, unlike the policy set forth in FAQ 33—in which the Secretary purports to
    exercise his delegated authority to define “costs incurred” in a manner not specifically
    addressed in the statute or regulation—the policy at issue in Guernsey derived “from an
    existing document whose meaning compels or logically justifies the proposition,”
    
    Mendoza, 754 F.3d at 1021
    —namely both the statute and its implementing regulation.
    In sum, we conclude that the policy set forth in FAQ 33 constitutes a legislative,
    rather than interpretive, rule. Because that policy amounts to a legislative rule, the APA
    required that agency promulgate the policy through notice-and-comment rulemaking. 5
    U.S.C. § 553(a)-(c). The Secretary failed to do so, and Children’s Hospital faces the
    prejudicial result of being obliged to repay at least $19.1 million to the State Medicaid
    16
    program. See Nat’l Ass’n of Home Builders v. Defs. of Wildlife, 
    551 U.S. 644
    , 659–60
    (2007) (“In administrative law, . . . there is a harmless error rule.”); Utility Solid Waste
    Activities Grp. v. EPA, 
    236 F.3d 749
    , 755 (D.C. Cir. 2001) (noting prejudice can arise
    from a party’s inability to comment on a rule before an agency promulgates it);
    Children’s 
    Hosp., 258 F. Supp. 3d at 689
    –91. Therefore, the district court properly
    enjoined the Secretary from enforcing the FAQ 33 policy against Children’s Hospital.
    B.
    In addition to concluding that the policy in FAQ 33 violated the APA’s procedural
    requirements, the district court further held that the policy conflicts with the plain and
    unambiguous language of Section 1396r-4(g)(1). 
    Children’s, 258 F. Supp. 3d at 689
    . In
    particular, the district court concluded that the statutory language does not authorize “the
    Secretary [to] define ‘costs’ to include private insurance payments.” 
    Id. at 686-87.
    Courts have recognized that there is no bright-line rule as to whether a court that
    has decided to vacate an agency action on procedural grounds should nonetheless address
    a substantive claim. See NRDC v. EPA, 
    643 F.3d 311
    , 321 (D.C. Cir. 2011) (noting that
    case law provides “little direction on whether, having determined to vacate on procedural
    grounds, we should nonetheless address substantive claims”). Given this absence of
    authority, we do not fault the district court for addressing Children’s Hospital’s
    substantive claim.
    Nevertheless, because it is unnecessary for us to address that claim to affirm the
    district court’s judgment, we decline to address Children’s Hospital’s substantive
    17
    challenge and, for the same reason, vacate the district court’s decision as to that claim. 1
    However, our decision to vacate the district court’s ruling as to Children’s Hospital
    substantive claim should not be read as expressing or implying any view on the merits of
    that claim or the validity of any amendment to the 2008 rule.
    III.
    For the foregoing reasons, we affirm the judgment of the district court enjoining
    the Secretary from enforcing the policy set forth in FAQ 33 against Children’s Hospital,
    and vacate the district court’s opinion to the extent it concludes that that policy conflicts
    with the language of Section 1396r-4(g), but without prejudice to Children’s Hospital’s
    right to raise that argument in another proceeding.
    AFFIRMED IN PART AND VACATED IN PART
    1
    This approach also is consistent with the approach taken by other courts that
    have invalidated the policy in FAQ 33 on procedural grounds. See N.H. 
    Hosp., 887 F.3d at 77
    ; Children’s Health Care v. Centers for Medicare & Medicaid Servs., No. 16-cv-
    4064, 
    2017 WL 3668758
    , at *9 (D. Minn. June 26, 2017) (declining to reach substantive
    challenge after vacating FAQ 33 on procedural grounds because “it would be merely
    advisory for this Court to decide whether Defendants would exceed their statutory
    authority if they attempted to promulgate the rule expressed in FAQ 33 by following the
    required procedures”); Texas Children’s Hosp. v. Burwell, 
    76 F. Supp. 3d 224
    , 240 n.5
    (D.D.C. 2014) (“Considerations of judicial economy and restraint counsel against
    deciding whether 42 U.S.C. § 1396r–4(g)(1)(A) could support a validly promulgated rule
    that codified [FAQ 33’s] policy in the future.”).
    18