W. A. Griffin, MD v. Delta Air Lines, Inc. ( 2021 )


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  •        USCA11 Case: 18-10418    Date Filed: 02/24/2021    Page: 1 of 26
    [PUBLISH]
    IN THE UNITED STATES COURT OF APPEALS
    FOR THE ELEVENTH CIRCUIT
    ________________________
    No. 18-10417
    ________________________
    D.C. Docket No. 1:17-cv-04656-AT
    W. A. GRIFFIN, MD,
    Plaintiff - Appellant,
    versus
    COCA-COLA REFRESHMENTS USA, INC.,
    UNITED HEALTHCARE INSURANCE COMPANY,
    Defendants - Appellees,
    UNITED HEALTHCARE OF GEORGIA, INC.,
    Defendant.
    ________________________
    No. 18-10418
    ________________________
    D.C. Docket No. 1:17-cv-04657-AT
    W. A. GRIFFIN, MD,
    USCA11 Case: 18-10418          Date Filed: 02/24/2021      Page: 2 of 26
    Plaintiff - Appellant,
    versus
    DELTA AIR LINES, INC.,
    UNITED HEALTHCARE INSURANCE COMPANY,
    Defendants - Appellees,
    UNITED HEALTHCARE PLAN OF GEORGIA, INC.,
    Defendant.
    ________________________
    Appeals from the United States District Court
    for the Northern District of Georgia
    ________________________
    (February 24, 2021)
    Before BRANCH and MARCUS, Circuit Judges, and UNGARO,∗ District Judge.
    BRANCH, Circuit Judge:
    Dr. Wakitha Griffin, a dermatologist in Atlanta, Georgia, has filed many
    appeals in this Court in recent years, all of which have involved her attempts to
    receive in-network payments despite being an out-of-network provider. Our other
    opinions have been unpublished; we choose to publish today in hopes of resolving
    this recurring litigation.
    ∗  The Honorable Ursula Ungaro, United States District Court for the Southern District of
    Florida, sitting by designation.
    2
    USCA11 Case: 18-10418        Date Filed: 02/24/2021   Page: 3 of 26
    These consolidated appeals arise from Griffin’s treatment of two patients
    who were insured under two separate employee welfare benefit plans which are
    administered by United Healthcare (“United”). The Employee Retirement Income
    Security Act of 1974 (“ERISA”) covers both plans. Because Griffin does not have
    a contract with United whereby she provides services in exchange for
    reimbursement at a negotiated rate, she is an out-of-network provider under both
    plans. Generally, patients are reimbursed at lower rates when receiving healthcare
    services from out-of-network providers rather than in-network providers.
    Eschewing a contractual relationship with United and payment from her
    patients, Griffin instead requested that the two patients assign their benefits under
    their plans to her. They obliged. Griffin then attempted to collect from United the
    same payment that she would have received had she been an in-network provider.
    When United only paid her the benefits she was entitled to as an out-of-network
    provider, Griffin brought two separate lawsuits—one against Coca-Cola
    Refreshments, Inc. (“Coca-Cola”) and United and the other against Delta Air
    Lines, Inc. (“Delta”) and United (collectively, “Defendants”)—asserting various
    ERISA violations. The district court dismissed both cases for failure to state a
    claim because the plans’ anti-assignment clauses prevented Griffin from obtaining
    statutory standing under ERISA to sue on behalf of her patients. Griffin appealed
    both cases to this Court.
    3
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    These consolidated appeals raise an unsettled issue about whether an ERISA
    plan administrator or its claims agent may waive its right to rely on an anti-
    assignment provision in an ERISA-covered plan. We need not reach that issue,
    however. Even assuming that waiver is available in the ERISA context,
    Defendants did not waive their ability to assert the anti-assignment provisions as a
    defense. And regardless of waiver, Griffin’s lawsuit still fails to state a claim:
    United paid her in full, both under the terms of the patients’ assignments and the
    provisions of the healthcare plans. We therefore affirm the district court’s orders.
    I.     Background
    Although these consolidated appeals implicate two distinct health benefit
    plans, patients, and assignments, the facts giving rise to Griffin’s claims in each
    case are largely the same. A few years ago, Griffin provided medical treatment for
    two patients: Patient J.J., who was insured under the Coca-Cola Plan, and Patient
    G.A., who was insured under the Delta Plan. 1 United is the Coca-Cola Plan’s
    Claims Fiduciary and the Delta Plan’s Claims Administrator. Under the terms of
    both plans, Griffin is an “out of network” physician. Generally, the plans
    reimburse the beneficiary at a higher percentage when he visits an in-network
    physician rather than an out-of-network physician. For example, the Coca-Cola
    1
    The Coca-Cola Company Benefits Committee is the Coca-Cola Plan Administrator and
    the Administrative Committee of Delta Air Line, Inc. is the Delta Plan Administrator.
    4
    USCA11 Case: 18-10418        Date Filed: 02/24/2021   Page: 5 of 26
    Plan provides that when a beneficiary has an office visit with an out-of-network
    physician, the plan pays 60 percent of the cost of service and the beneficiary pays
    40 percent. By contrast, if the beneficiary has an office visit with an in-network
    physician, the plan pays at least 80 percent.
    In exchange for medical treatment and in lieu of payment, the two patients
    executed an assignment of their plan benefits to Griffin. Both assignments are
    identical. By signing, the patient acknowledges that the document is “a direct legal
    assignment of my rights and benefits under this policy and designation of
    authorized representative” and “authorize[s] any plan administrator or fiduciary,
    insurer, and my attorney to release to such provider(s) any and all plan
    documents.” The assignment further provides that the patient has assigned “all
    medical benefits and/or insurance reimbursement, if any, otherwise payable to [the
    patient] for services rendered from such provider(s), regardless of such provider’s
    managed care network participation status.”
    Griffin believed that the assignments entitled her to full payment for her
    services, as if she were an in-network provider. She submitted claims to United,
    which she alleges United only partially paid. Griffin appealed United’s payment
    determinations. In her appeals, Griffin made numerous requests, including: (1)
    that United disclose the plan’s unambiguous anti-assignment provision, should the
    5
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    plan have one; (2) copies of the plan documents; and (3) the identification of the
    Plan Administrator.
    United denied each appeal and responded directly to the patients, copying
    Griffin on the communications. In each appeal denial, United explained that
    Griffin was not reimbursed the full amount of her charges because of the relevant
    plan’s provisions regarding out-of-network coverage and deductibles. United
    therefore upheld the payment determinations and did not address Griffin’s specific
    requests. Undeterred, Griffin submitted second level appeals for both claims and
    reiterated her requests. United again denied the appeals without addressing
    Griffin’s requests.
    After exhausting her administrative remedies, Griffin, proceeding pro se,
    filed two complaints in Georgia state court: one against United and Coca-Cola, for
    her treatment of Patient J.J., and the other against United and Delta, for her
    treatment of Patient G.A. The operative complaints are nearly identical and bring
    the same four claims: failure to pay plan benefits under 
    29 U.S.C. § 1132
     (Count
    1), breach of fiduciary duty under 
    29 U.S.C. § 1104
     (Count 2), failure to provide
    plan documents under 
    29 U.S.C. §§ 1024
    (b), 1104, and 1132(2) (Count 3); and
    breach of co-fiduciary duties under 
    29 U.S.C. § 1105
    (a)(2) (Count 4). Defendants
    removed both lawsuits to the United States District Court for the Northern District
    of Georgia and moved to dismiss Griffin’s complaints for failure to state a claim.
    6
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    Griffin was in familiar territory in the district court. In the last four years,
    Griffin has filed more than two dozen cases either directly in the Northern District
    of Georgia or in state court that were later removed to that district court. 2 All
    involve Griffin seeking reimbursement from health plans through her patients’
    assignment of benefits.
    2
    See Griffin v. Blue Cross and Blue Shield Healthcare Plan of Ga., Inc., et al, No. 1:14-
    cv-1610-AT (N.D. Ga. filed May 28, 2014); Griffin v. S. Co. Servs., Inc., No. 1:15-cv-0115-AT
    (N.D. Ga. filed Jan. 14, 2015); Griffin v. SunTrust Bank, Inc., No. 1:15-cv-0147-AT (N.D. Ga.
    filed Jan. 16, 2015); Griffin v. FOCUS Brands Inc., No. 1:15-cv-0170-AT (N.D. Ga. filed Jan.
    20, 2015); Griffin v. Health Sys. Mgmt., Inc., No. 1:15-cv-0171-AT (N.D. Ga. filed Jan. 20,
    2015); Griffin v. Lockheed Martin Corp., No. 1:15-cv-0267-AT (N.D. Ga. filed Jan. 28, 2015);
    Griffin v. Gen. Mills, Inc., No. 1:15-cv-0268-AT (N.D. Ga. filed Jan. 28, 2015); Griffin v.
    Oldcastle, Inc., No. 1:15-cv-0269-AT (N.D. Ga. filed Jan 28, 2015); Griffin v. Habitat for
    Humanity Int’l, Inc., No. 1:15-cv-0369-AT (N.D. Ga. filed Jan 28, 2015); Griffin v. Verizon
    Commc’ns, Inc., No. 1:15-cv-0569-AT (N.D. Ga. filed Feb. 26, 2015); Griffin v. Humana
    Employers Health Plan of Ga., Inc., No. 1:15-cv-3574-AT (N.D. Ga. filed Oct. 8, 2015); Griffin
    v. Aetna Health Inc., et al., No. 1:15-cv-3750-AT (N.D. Ga. filed Oct. 26, 2015); Griffin v. Gen.
    Elec. Co., No. 1:15-cv-4439-AT (N.D. Ga. filed Dec. 22, 2015); Griffin v. Navistar, Inc., No.
    1:16-cv-0190-AT (N.D. Ga. filed Jan. 21, 2016); Griffin v. Humana Employers Health Plan of
    Ga., Inc., No. 1:16-cv-0245-AT (N.D. Ga. filed Jan. 26, 2016); Griffin v. Coca-Cola Enters.,
    Inc., No. 1:16-cv-0389-AT (N.D. Ga. filed Feb. 9, 2016); Griffin v. Sevatec, Inc., No. 1:16-cv-
    0390-AT (N.D. Ga. filed Feb. 9, 2016); Griffin v. Cassidy Turley Com. Real Estate Servs.s, Inc.,
    No. 1:16-cv-0496-AT (N.D. Ga. filed Feb. 17, 2016); Griffin v. Americold Logistics, LLC, No.
    1:16-cv-0497-AT (N.D. Ga. filed Feb. 17, 2016); Griffin v. Applied Indus. Techs., Inc., No. 1:16-
    cv-0552-AT (N.D. Ga. filed Feb. 23, 2016); Griffin v. Areva, Inc., No. 1:16-cv-0553-AT (N.D.
    Ga. filed Feb. 23, 2016); Griffin v. FOCUS Brands, Inc., No. 1:16-cv-0791-AT (N.D. Ga. filed
    Mar. 10, 2016); Griffin v. Northside Hosp., Inc., No. 1:16-cv-1934-AT (N.D. Ga. filed June 10,
    2016); Griffin v. Crestline Hotels & Resorts, LLC, No. 1:16-cv-2022-AT (N.D. Ga. filed June 16,
    2016); Griffin v. Verizon Commc’ns, Inc., No. 1:16-cv-2639 (N.D. Ga. filed July 20, 2016);
    Griffin v. RightChoice Managed Care, Inc., et al, No. 1:16-cv-3102 (N.D. Ga. filed Aug. 23,
    2016); Griffin v. Aetna Health Inc., et al, No. 1:17-cv-00077 (N.D. Ga. filed Jan. 6, 2017);
    Griffin v. United Healthcare of Ga., Inc., et al, No. 1:17-cv-4561-AT (N.D. Ga. filed Nov. 13,
    2017); Griffin v.Coca-Cola Refreshments USA, Inc., et al, No. 1:17-cv-4656-AT (N.D. Ga. filed
    Nov. 20, 2017). Griffin v. Delta Air Lines, Inc., et al, No. 1:17-cv-4657-AT (N.D. Ga. Nov. 20,
    2017).
    7
    USCA11 Case: 18-10418        Date Filed: 02/24/2021    Page: 8 of 26
    Similar to her past claims, her allegations here focus on United’s failure to
    disclose to her whether the plans had anti-assignment provisions, even though she
    requested them in her claim appeals. And because Defendants did not provide her
    the plan documents containing those provisions, Griffin’s complaints allege that
    they cannot rely on them in defense of their lawsuit.
    In their motions to dismiss Griffin’s complaints, Defendants asserted that the
    plans’ anti-assignment provisions rendered the assignment of benefits void. The
    plans each contain anti-assignment provisions. 3 The Coca-Cola Plan provides:
    9.02 Assignment. If applicable, an Enrolled Person may authorize the
    Plan to directly pay the service provider or hospital that provided the
    Enrolled Person’s covered care and treatment. Except as provided in
    the foregoing sentence, and subject to Section 9.06 of this Plan
    relating to Qualified Medical Child Support Orders, an Enrolled
    Person may not assign or alienate any payment with respect to any
    Benefit which an Enrolled Person is entitled to receive from the Plan,
    and further, except as may be prescribed by law, no Benefits shall be
    subject to attachment or garnishment of or for an Enrolled Person’s
    debts or contracts, except for recovery of overpayments made on an
    Enrolled Person’s behalf by this Plan.
    Another section of the plan states, “While benefits payable at any time may be
    used to make direct payments to health care providers, no amount payable at any
    3
    The Coca-Cola Plan has two operative plan documents: the Coca-Cola Company Health
    and Welfare Benefits Plan (“Wrap Document”) and the Summary Plan Descriptions and Benefit
    Policies (“SPD”). The SPD is incorporated by reference into the Plan through the Wrap
    Document. We refer to them together as the “Coca-Cola Plan.”
    The Delta Plan also has two operative plan documents: the Account-Based Healthcare
    Plan (“Wrap Document”) and the Summary Plan Descriptions and Benefit Policies (“SPD”).
    The SPD is incorporated by reference into the Plan through the Wrap Document. We refer to
    them together as the “Delta Plan.”
    8
    USCA11 Case: 18-10418        Date Filed: 02/24/2021   Page: 9 of 26
    time shall be subject in any matter to alienation by assignment of any kind. Any
    attempt to assign any such amount shall be void.” The Coca-Cola Plan further
    provides that beneficiaries “may not assign any rights or cause of action that [they]
    may have against a third-party to recover medical expenses without the express
    written consent of the Plan Administrator.”
    Similarly, the Delta Plan provides:
    13.07 Anti-Alienation of Benefits. Except as required by law, no
    benefit, payment or distribution under the Plan shall be subject to the
    claim of any creditor of the Participant, or to any legal process by any
    creditor of the Participant, or to any legal process by any creditor of
    the Participant, and the participant shall not have any right to alienate,
    commute, anticipate or assign (either at law or in equity) all or any
    portion of any benefit, payment or distribution under the Plan except
    to the extent provided herein; provided, however, a Participant may
    make a voluntary and revocable assignment, but only for such
    purposes as the Administrative Committee may from time to time
    specify.
    Another section of the plan states:
    Except as required by law, no benefit, payment or distribution under
    the plans will be subject to the claim of any creditor of a participant,
    or to any legal process by any creditor of the participant, and the
    participant will not have any right to alienate, commute, anticipate or
    assign all or any portion of any benefit, payment or distribution under
    the plans.
    However, a participant may make a voluntary and revocable
    assignment, but only for such purposes as the Plan Administrator may
    specify from time to time.
    The district court dismissed both of Griffin’s complaints for failure to state a
    claim. Regarding her suit against Delta and United, the district court found the
    9
    USCA11 Case: 18-10418       Date Filed: 02/24/2021   Page: 10 of 26
    Delta Plan’s anti-assignment provisions barred all of Griffin’s claims. In its order
    dismissing the suit against Coca-Cola and United, the district court similarly found
    the Coca-Cola Plan’s anti-assignment provisions indisputably barred Griffin’s
    claim for payment under the plan (Count 1). The court also found that, even if the
    language of the anti-assignment provisions did not bar the remaining non-payment
    claims (Counts 2, 3, and 4), the assignment itself did not include the right to bring
    those non-payment claims. Accordingly, she lacked derivative statutory standing
    to bring those claims as well. The district court did not address Griffin’s waiver
    arguments. Griffin appealed the district court’s orders to this Court.
    Griffin presents three issues on appeal. First, did the patients legally assign
    Griffin the right to bring the breach of fiduciary duty and statutory penalties claims
    (the “non-payment-related claims”) as well as benefit claims? Second, do the anti-
    assignment provisions apply to Griffin’s claims for underpayment of benefits
    and/or the non-payment claims? Third, if they do apply to some or all of the
    claims, are Defendants estopped from relying on the anti-assignment provisions or
    have they otherwise waived the right to assert them?
    We appointed Griffin counsel sua sponte and set this case for oral argument.
    After reviewing the record, the parties’ briefs, and oral argument, we affirm the
    lower court’s decisions.
    II.    Standard of Review and ERISA
    10
    USCA11 Case: 18-10418        Date Filed: 02/24/2021    Page: 11 of 26
    The Court of Appeals reviews “de novo the district court’s grant of a motion
    to dismiss under [Federal Rule of Civil Procedure] 12(b)(6) for failure to state a
    claim, accepting the allegations in the complaint as true and construing them in the
    light most favorable to the plaintiff.” Lanfear v. Home Depot, Inc., 
    679 F.3d 1267
    ,
    1275 (11th Cir. 2012) (quoting Ironworkers Local Union 68 v. AstraZeneca
    Pharm., LP, 
    634 F.3d 1352
    , 1359 (11th Cir. 2011)).
    ERISA, which governs this case, sets the minimum standards for employee
    benefit plans, such as the healthcare plans at issue here. See 
    29 U.S.C. §§ 1001
    ,
    1002. Section 502(a) of ERISA creates federal causes of action for recovery of
    benefits under such plans. See 
    29 U.S.C. § 1132
    (a)(1)(B) (“A civil action may be
    brought . . . by a participant or beneficiary . . . to recover benefits due to him under
    the terms of his plan, to enforce his rights under the terms of the plan, or to clarify
    his rights to future benefits under the terms of the plan[.]”). ERISA also allows
    participants to bring actions under section 502(a) against plan fiduciaries for
    breach of fiduciary duty. 
    29 U.S.C. § 1104
    . In addition, section 405(a) of ERISA
    imposes co-fiduciary liability on all plan fiduciaries in certain circumstances. Id..
    § 1105. Finally, ERISA requires plan administrators, upon request, to provide plan
    information to participants and allows for participants to seek statutory penalties
    for a plan’s failure to do so. Id. § 1132(c)(1). Critically, to maintain an action
    under ERISA, a plaintiff must have standing to sue under the statute. Physicians
    11
    USCA11 Case: 18-10418            Date Filed: 02/24/2021         Page: 12 of 26
    Multispecialty Grp. v. Health Care Plan of Horton Homes, Inc., 
    371 F.3d 1291
    ,
    1293–94 (11th Cir. 2004).4
    In enacting ERISA, Congress broadly preempted state law relating to
    employee benefit plans. Mackey v. Lanier Collection Agency & Serv., Inc., 
    486 U.S. 825
    , 829 (1988); see generally Pilot Life Ins. Co. v. Dedeaux, 
    481 U.S. 41
    (1987). Where ERISA is silent on an issue, Congress intended for courts to
    fashion a federal common law governing employee benefit plans. Glass v. United
    of Omaha Life Ins. Co., 
    33 F.3d 1341
    , 1347 (11th Cir. 1994). We have explained
    the process for determining federal common law under ERISA:
    To decide whether a particular rule should become part of ERISA’s
    common law, courts must examine whether the rule, if adopted, would
    further ERISA’s scheme and goals . . . ERISA has two central goals:
    (1) protection of the interests of employees and their beneficiaries in
    employee benefit plans; and (2) uniformity in the administration of
    employee benefit plans.
    Horton v. Reliance Standard Life Ins. Co., 
    141 F.3d 1038
    , 1041 (11th Cir. 1998).
    When tasked with shaping federal common law in the ERISA context, this Court
    has explicitly relied on rules found in the Restatement of Contracts, see, e.g.,
    Turner v. Am. Fed’n of Teachers Local 1565, 
    138 F.3d 878
    , 882 (11th Cir. 1998),
    4
    As used in this context, standing is not jurisdictional, Article III standing, but rather the
    right to make a claim under the statute. Physicians Multispecialty Grp. v. Health Care Plan of
    Horton Homes, Inc., 
    371 F.3d 1291
    , 1293–94 (11th Cir. 2004).
    12
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    and state law, see, e.g., Tippit v. Reliance Standard Life Ins. Co., 
    457 F.3d 1227
    ,
    1235 (11th Cir. 2006) (using Georgia law to interpret ambiguous plan).
    III.   Analysis
    a. The Scope of the Patients’ Assignments
    We first determine the scope of the patients’ assignments to Griffin—
    whether they purport to give her the right to bring both payment and non-payment
    (breach of fiduciary duties and statutory penalties) claims.
    To maintain an action under ERISA, a plaintiff must have statutory standing.
    ERISA limits the right to sue for plan participants, plan beneficiaries, plan
    fiduciaries, and the Secretary of Labor. 
    29 U.S.C. § 1132
    (a). “Healthcare
    providers . . . are generally not ‘participants’ or ‘beneficiaries’ under ERISA.”
    Physicians Multispecialty Grp., 
    371 F.3d at 1294
    . Still, an assignee may obtain
    derivative standing for payment of medical benefits through a written assignment
    from a plan participant or beneficiary. See Gables Ins. Recovery, Inc. v. Blue
    Cross & Blue Shield of Fla., Inc., 
    813 F.3d 1333
    , 1339 (11th Cir. 2015).5
    In this case, no party doubts that the assignments’ language purports to
    convey to Griffin a right to bring the claim for unpaid benefits. But Griffin argues
    that the patients assigned all their rights—including the right to bring fiduciary and
    5
    For the reasons discussed herein, we need not decide whether the assignment of nonpayment
    claims provides derivative standing.
    13
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    statutory penalty claims—under the plans because the assignments state: “This is a
    direct legal assignment of my rights and benefits under the policy.” That sentence,
    Griffin claims, is enough to transfer the participant’s right to bring claims both for
    unpaid payments and non-payment related claims.
    In numerous unpublished decisions, we have rejected similar claims (all
    made by Griffin) regarding the assignment of the right to bring non-payment
    claims like those in Counts 2, 3, and 4. See, e.g., Griffin v. SunTrust Bank Inc.,
    648 F. App’x 962, 967 (11th Cir. 2016) (“Nothing in an assignment of benefits
    transfers the patient’s right to bring a cause of action” for similar non-payment-
    related claims.); Griffin v. Health Sys. Mgmt. Inc, 635 F. App’x 768, 772 n.4 (11th
    Cir. 2015). Griffin argues that these prior decisions only examine particular lines
    in the assignment, and we have not considered the exact language she points to in
    this appeal. Because the language Griffin relies on in this appeal assigns both
    “rights and benefits under the policy,” Griffin claims, it expressly assigns the right
    to bring both payment and non-payment-related claims.
    Even assuming this “rights and benefits” language evinces the assignment of
    two distinct rights—the right to bring claims for both payment and non-payment—
    the assignments themselves contradict Griffin’s argument. The general form
    assignments on which Griffin relies contain 10 separately listed paragraphs
    outlining the scope of the assignments. The patients checked the box next to each
    14
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    one. None of the paragraphs mention breach of fiduciary duty or statutory penalty
    claims. Rather, they provide the details of Griffin’s “right” to receive the patients’
    “medical information” and “payment of benefits” under the Plan. Therefore, the
    assignments make clear that the patients only assigned their right to bring claims
    for payment pursuant to 
    29 U.S.C. § 1132
    . Accordingly, the district court was
    correct to dismiss Griffin’s non-payment claims.
    b. The Plans’ Anti-Assignment Provisions
    i. Applicability to Griffin’s Payment Claim
    We next turn to whether Griffin’s payment claim survives the language of
    the plans’ anti-assignment provisions. We find that her payment claim does not.
    We have held that “an unambiguous anti-assignment provision in an ERISA-
    governed welfare benefit plan is valid and enforceable” against healthcare
    providers. Physicians Multispecialty Grp., 
    371 F.3d at 1296
    . The anti-assignment
    language in the plans at issue is unambiguous and thus enforceable. The Coca-
    Cola Plan says a participant “may not assign or alienate any payment with respect
    to any Benefit,” and “no amount payable at any time shall be subject in any matter
    to alienation by assignment of any kind. Any attempt to assign any such amount
    shall be void.” Similarly, the Delta Plan provides that “the participant shall not
    have any right to alienate, commute, anticipate or assign (either at law or in equity)
    all or any portion of any benefit, payment or distribution under the Plan.” And
    15
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    another provision similarly states: “the participant will not have any right to
    alienate, commute, anticipate or assign all or any portion of any benefit, payment
    or distribution under the plans.” On their face, these provisions restrict a patient’s
    ability to assign his rights and therefore bar Griffin’s claims.
    In fact, Griffin “recognizes the weight of authority from this Court affirming
    the dismissals of several cases filed by Dr. Griffin based on the application of anti-
    assignment provisions to similar claims brought by Dr. Griffin under ERISA for
    unpaid benefits.” But she urges this Court to reverse course and follow the Fifth
    Circuit’s lead in its 1992 opinion in Hermann Hospital v. MEBA Medical and
    Benefits Plan, 
    959 F.2d 569
     (5th Cir. 1992), overruled in part on other grounds by
    Access Mediquip, L.L.C. v. United Healthcare Insurance Co., 
    698 F.3d 229
    , 230
    (5th Cir. 2012) (en banc).
    In Hermann, the Fifth Circuit held that the defendant plan’s anti-assignment
    provisions were unenforceable against a healthcare provider. The patient in that
    case assigned “all rights, title and interest in the benefits payable for services
    rendered by the [healthcare provider]” to the provider-plaintiff. 
    Id. at 571
    . The
    anti-assignment provision at issue stated:
    No employee, dependent or beneficiary shall have the right to assign,
    alienate, transfer, sell, hypothecate, mortgage, encumber, pledge,
    commute, or anticipate any benefit payment hereunder, and any such
    payment shall not be subject to any legal process to levy execution
    upon or attachment or garnishment proceedings against for the
    payment of any claims.
    16
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    Id. at 574
    . The Fifth Circuit held that the anti-assignment clause did not, by its
    terms, void the assignment to the provider because it did not explicitly cover
    healthcare providers. 
    Id. at 575
    . The court found it would be inequitable to
    prevent providers from recovering for the services they rendered unless the
    participants first sued the plan and the provider then sued the participants. 
    Id.
    Thus, Griffin claims that this Court should find the Coca-Cola Plan’s and Delta
    Plan’s anti-assignment provisions do not bar the assignments because she received
    the assignment in her capacity as a healthcare provider.
    But Griffin effectively asks this Court to invalidate an unambiguous contract
    provision which is valid and enforceable under our precedent based on the policy
    preferences of another circuit. We cannot depart from our precedent. See Wilson
    v. Taylor, 
    658 F.2d 1021
    , 1034 (5th Cir. May 1, 1981) (“It is the firm rule of this
    circuit that we cannot disregard the precedent set by a prior panel, even though we
    perceive error in the precedent. Absent an intervening Supreme Court decision
    which changes the law, only the en banc court can make the change.”). Thus, if
    nothing else prevents Defendants from relying on the anti-assignment provisions in
    this litigation, the provisions bar Griffin’s claims for unpaid benefits.
    ii. Void v. Voidable
    Before we turn to Griffin’s remaining arguments as to why Defendants
    either waived or are estopped from relying on these anti-assignment provisions, we
    17
    USCA11 Case: 18-10418         Date Filed: 02/24/2021       Page: 18 of 26
    must address an often-overlooked threshold issue: whether the anti-assignment
    provisions make the assignments void or voidable. 6 If the assignments are void ab
    initio then there is no need to proceed to the equitable claims because each
    assignment is inherently null. On the other hand, if the assignments are merely
    voidable, then they are effective unless and until they are challenged. See, e.g.,
    Pitts ex rel. Pitts v. Am. Sec. Life Ins. Co., 
    931 F.2d 351
    , 356 (5th Cir. 1991)
    (discussing consequences of determining whether insurance policy was void rather
    than voidable). Estoppel and waiver would only be available defenses to a
    voidable anti-assignment clause.
    As discussed above, federal courts fill in the gaps Congress left in ERISA
    with federal common law. Glass, 
    33 F.3d at 1347
    . ERISA itself does not give an
    answer to the issue of void versus voidable. Nor have the parties addressed it.
    And federal courts have not discussed the distinction between void and voidable in
    the ERISA context. Courts sometimes even use these concepts interchangeably. 7
    6
    Black’s Law Dictionary defines “void” as “[o]f no legal effect; to null.” Void, Black’s
    Law Dictionary (11th ed. 2019). Something that is “void ab initio” is “[n]ull from the beginning,
    as from the first moment when a contract is entered into. A contract is void ab initio if it
    seriously offends law or public policy, in contrast to a contract that is merely voidable at the
    election of one party to the contract.” 
    Id.
     The term “voidable” is defined as “[v]alid until
    annulled,” that is, “capable of being affirmed or rejected at the option of one of the parties.”
    Voidable, Black’s Law Dictionary (11th ed. 2019).
    7
    “[C]ourts have lamented that ‘[t]he distinction between void and voidable is not as
    distinctly defined as could be wished.’ As a result, ‘[c]ourts have used the words “void,”
    “voidable,” “invalid,” and “unenforceable” imprecisely’ or even interchangeably.” Jesse A.
    Schaefer, Beyond a Definition: Understanding the Nature of Void and Voidable Contracts, 33
    CAMPBELL L. REV. 193, 194 (2010) (quoting Arnold v. Fuller’s Heirs, 
    1 Ohio 458
    , 467 (Ohio
    18
    USCA11 Case: 18-10418          Date Filed: 02/24/2021       Page: 19 of 26
    Absent other guidance, we may look to the applicable state law to fill in
    ERISA’s gaps. Glass, 
    33 F.3d at 1347
    . The Georgia Code renders as void: (1)
    contracts to do immoral or illegal things, (2) contracts against public policy, and
    (3) gambling contracts. O.C.G.A. §§ 13-8-1, 13-8-2, 13-8-3. This definition
    comports with our century-old precedent: in 1906, the former Fifth Circuit
    explained:
    The distinction between ‘void’ and ‘voidable’ in their application to
    contracts is sometimes one of practical importance. A transaction
    may be void as to one party, and not as to another. When entire
    technical accuracy is desired, the term ‘void’ can only be properly
    applied to those contracts that are of no effect whatsoever, . . . or in
    contravention of that which the law requires, and therefore incapable
    of confirmation or ratification.
    Haggart v. Wilczinski, 
    143 F. 22
    , 27 (5th Cir. 1906). The assignments here are not
    illegal. Nor do they contravene public policy. See Cagle v. Bruner, 
    112 F.3d 1510
    , 1515 (11th Cir. 1997) (“[N]either § 1132(a) nor any other ERISA provision
    prevents derivative standing based upon an assignment of rights[.]”). And they
    have nothing to do with gambling. Accordingly, the assignments here are merely
    voidable rather than void ab initio and thus are enforceable unless and until
    Defendants raise the anti-assignment provisions. To put it another way, the
    1824) and Daugherty v. Kessler, 
    286 A.2d 95
    , 97 (Md. 1972)). This confusion is noted in
    Black’s Law Dictionary: “the word [void] is often used and construed as bearing the more liberal
    meaning of ‘voidable.’” Void, Black’s Law Dictionary (11th ed. 2019).
    19
    USCA11 Case: 18-10418       Date Filed: 02/24/2021   Page: 20 of 26
    existence of those provisions did not automatically nullify the assignments, and
    thus equitable doctrines are available. Having said all that, we can turn to Griffin’s
    waiver and estoppel arguments.
    c. Waiver
    Griffin argues that Defendants waived their right to rely on the anti-
    assignment provisions because they did not alert her to their existence prior to
    litigation. We disagree.
    “Waiver is the voluntary, intentional relinquishment of a known right.”
    Glass, 
    33 F.3d at 1347
    ; see also Pitts, 
    931 F.2d at 357
    ; Appleman, Insurance Law
    and Practice, § 9251, at 488–89 (1981). Waiver can be express or implied from
    conduct. In re Garfinkle, 
    672 F.2d 1340
    , 1347 (11th Cir. 1982). “Where a party
    alleges an implied waiver, ‘the acts, conduct, or circumstances relied upon to show
    waiver must make out a clear case’” of intentional relinquishment. Witt v. Metro
    Life Ins. Co., 
    772 F.3d 1269
    , 1279 (11th Cir. 2014) (quoting In re Garfinkle, 
    672 F.2d at 1347
    ).
    Because ERISA does not address waiver, courts have fashioned federal
    common law to address cases where a defendant relies on a contractual provision
    to defeat a claim. But various circuits have approached the problem differently.
    For example, the Fourth Circuit considers waiver to be a “prohibited concept” with
    respect to ERISA. Gagliano v. Reliance Standard Life Ins. Co., 
    547 F.3d 230
    , 239
    20
    USCA11 Case: 18-10418       Date Filed: 02/24/2021    Page: 21 of 26
    (4th Cir. 2008). Other circuits have reached the opposite conclusion. See, e.g.
    Glista v. Unum Life Ins. Co. of America, 
    378 F.3d 113
    , 132 (1st Cir. 2004)
    (insurance company waived its right to raise a policy’s clause for the first time in
    litigation). This circuit has “left open the question of whether waiver principles
    might apply under the federal common law in the ERISA context,” Witt, 772 F.3d
    at 1279, and we do so again today because we need not decide it.
    Even if the doctrine applies in the ERISA context, waiver would not be
    available under the facts of this case. None of the Defendants expressly
    relinquished its right to assert the anti-assignment clauses in litigation. And Griffin
    does not allege any acts that would indicate they intentionally did so. Boiled
    down, Griffin alleges that defendants ignored her pre-litigation requests for plan
    documents and any anti-assignment provisions, if they existed. Evidence that an
    insurance plan’s claims administrator ignored a third party’s pre-litigation request
    for information about a contract with another party, without more, is insufficient to
    show that the claims administrator or provider voluntarily or intentionally
    abandoned a contractual defense to litigation. Thus, even if waiver applied,
    Griffin’s allegations are insufficient to establish that the Defendants waived the
    anti-assignment provisions.
    d.    Estoppel
    21
    USCA11 Case: 18-10418       Date Filed: 02/24/2021   Page: 22 of 26
    As an alternative to her waiver claim, Griffin argues that Defendants are
    equitably estopped from relying on the anti-assignment provisions because they
    did not respond to her pre-litigation inquiries as to whether the Coca-Cola Plan and
    the Delta Plan contained such provisions.
    In the ERISA context, equitable estoppel applies when “the plaintiff can
    show that (1) the relevant provisions of the plan at issue are ambiguous, and (2) the
    plan provider or administrator has made representations to the plaintiff that
    constitute an informal interpretation of ambiguity.” Jones v. Am. Gen. Life & Acc.
    Ins. Co., 
    370 F.3d 1065
    , 1069 (11th Cir. 2004). Equitable estoppel in the ERISA
    context is “very narrow.” 
    Id.
    The anti-assignments provisions in the two plans at issue here are not
    ambiguous. Even if they were, Griffin does not submit any evidence, or even
    allege, that Coca-Cola, Delta, or United made any representation to Griffin that
    informally interpreted the provision. A straightforward application of the narrow
    ERISA estoppel doctrine compels this Court to find that Griffin cannot turn to it
    here.
    Griffin asks this Court to rely on the Fifth Circuit’s decision in Hermann and
    the Sixth Circuit’s dicta in Sprague v. Gen. Motors Corp., 
    133 F.3d 388
    , 404 (6th
    Cir. 1998) to find that equitable estoppel’s ambiguity requirement does not apply
    to Griffin. We are unpersuaded. In Hermann, the Fifth Circuit held that the
    22
    USCA11 Case: 18-10418        Date Filed: 02/24/2021    Page: 23 of 26
    defendant was estopped from asserting that the anti-assignment clause applied
    because Hermann, the medical provider, “was not privy to” the plan documents
    and it was the defendant plan’s “responsibility to notify Hermann” of the anti-
    assignment clause. 
    959 F.2d at 574
    . Similarly, in Sprague, the Sixth Circuit
    observed that the party asserting estoppel’s reliance “can seldom, if ever, be
    reasonable or justifiable if it is inconsistent with the clear and unambiguous terms
    of the plan documents available to or furnished to the party.” 
    133 F.3d at 404
    (emphasis added). But the facts of Hermann differ from the facts here. In that
    case, the payor repeatedly made false representations to the provider. See
    Hermann, 
    959 F.2d at 574
    . And in Sprague, the Sixth Circuit clarified that in
    order to assert an estoppel claim, “there must be conduct or language amounting to
    a representation of a material fact.” 
    133 F.3d at 403
    . Here, none of the Defendants
    made any representations directly to the provider: they communicated with the
    beneficiaries and copied Griffin on the communications. And while United did not
    provide Griffin with the requested information, neither did it lie to her.
    Further, Griffin’s estoppel argument is foreclosed by our precedent. In the
    years following Herman and Sprague, this Court has never disregarded the
    ambiguity requirement. See, e.g., Jones, 
    370 F.3d at 1070
     (“[W]hether proceeding
    on a breach of contract or equitable estoppel theory, an ERISA plaintiff can only
    succeed . . . if he can establish that the plan at issue is at least ambiguous with
    23
    USCA11 Case: 18-10418      Date Filed: 02/24/2021    Page: 24 of 26
    respect to the relevant benefits for which he claims entitlement.”). And, in the past
    five years, we have addressed Griffin’s estoppel argument in a series of
    unpublished decisions relating to similar claims based on similar facts. Each time,
    we held that equitable estoppel does not apply. See Griffin v. United Healthcare of
    Ga., Inc., 754 F. App’x 793, 797 (11th Cir. 2018) (“[E]quitable estoppel cannot
    apply” where plan documents were not provided); Griffin v. Coca-Cola Enters.,
    Inc., 686 F. App’x 820, 822 (11th Cir. 2017) (same); Griffin v. Habitat for
    Humanity Int’l, Inc., 641 F. App’x 927, 932 (11th Cir. 2016) (same); Griffin v.
    Verizon Commc’ns, Inc., 641 F. App’x 869, 874 (11th Cir. 2016) (same); Griffin v.
    S. Co. Servs., 635 F. App’x 789, 795 (11th Cir. 2015) (same); Griffin v. Focus
    Brands, Inc., 635 F. App’x 796, 801 (11th Cir. 2015) (same); Griffin v. Health Sys.
    Mgmt., Inc., 635 F. App’x 768, 773 (11th Cir. 2015) (same). A decades-old case
    from another circuit does not disturb that conclusion. Equitable estoppel does not
    prevent plan administrators or claims fiduciaries from relying on anti-assignment
    provisions simply because they did not alert the provider of such provisions.
    In sum, although the assignments gave Griffin statutory standing pursuant to
    ERISA to bring claims for payment for the services she provided, the Defendants’
    anti-assignment provisions made the assignments voidable. Even assuming waiver
    is available in the ERISA context, Defendants did not waive their ability to assert
    the anti-assignment provisions when Griffin filed claims against them. Neither
    24
    USCA11 Case: 18-10418      Date Filed: 02/24/2021    Page: 25 of 26
    does estoppel aid Griffin in avoiding the effect of the anti-assignment provisions.
    Therefore, the anti-assignment provisions deprived Griffin of her ability to bring
    these ERISA claims.
    e. Failure to State a Claim
    We make a final observation about Griffin’s claims before concluding.
    Assuming, arguendo, that Defendants’ plans did not have enforceable anti-
    assignment provisions and Griffin had statutory standing to bring claims for
    payment pursuant to ERISA, Griffin would still fail to state a claim because she is
    not entitled to any more compensation than she already received.
    Recall that each assignment at issue is “a direct legal assignment of [the
    patient’s] rights and benefits under this policy and designation of authorized
    representative.” They also state:
    In considering the amount of medical expenses to be incurred, I, [the
    patient], have insurance and/or employee health care benefits
    coverage, and hereby assign and convey directly to the above named
    healthcare provider(s), as my designated Authorized
    Representative(s), all medical benefits and/or insurance
    reimbursement, if any, otherwise payable to me for services rendered
    from such provider(s), regardless of such provider’s managed care
    network participation status.
    Griffin’s “managed care network participation status” is critical. The patients
    visited an out-of-network provider—Griffin. Had they paid Griffin out of pocket
    and filed a claim for reimbursement with United, United would have been
    obligated to reimburse the patients according to their policies for out of network
    25
    USCA11 Case: 18-10418           Date Filed: 02/24/2021        Page: 26 of 26
    providers. That analysis does not change simply because the patient assigned the
    payments to Griffin. 8 Because the patients have no right to full reimbursement for
    the charged services, neither does Griffin. The assignment changes nothing.
    Either way, Griffin does not have a claim against Defendants.
    We therefore AFFIRM the district court’s orders.
    8
    For example, Griffin charged Patient J.J. $129.96 for the office visit. Patient J.J.’s plan
    covered 60 percent of that charge. Therefore, United directly paid Griffin $77.98. United paid
    Griffin exactly what it would have paid the Patient J.J. if that patient had followed the process
    above.
    26