U.S. Ex Rel. Anita Silingo v. Wellpoint, Inc. , 895 F.3d 619 ( 2018 )


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  •               FOR PUBLICATION
    UNITED STATES COURT OF APPEALS
    FOR THE NINTH CIRCUIT
    UNITED STATES EX REL. ANITA            No. 16-56400
    SILINGO,
    Plaintiff-Appellant,       D.C. No.
    8:13-cv-01348-
    v.                       FMO-JC
    WELLPOINT, INC., an Indiana
    corporation; ANTHEM BLUE CROSS,          OPINION
    business entity, form unknown;
    HEALTH NET, INC.; HEALTH NET OF
    CALIFORNIA, INC., a California
    corporation; HEALTH NET LIFE
    INSURANCE COMPANY, a California
    corporation; VISITING NURSE
    SERVICE CHOICE; MOLINA
    HEALTHCARE, INC., a Delaware
    corporation; MOLINA HEALTHCARE
    OF CALIFORNIA, a California
    corporation; MOLINA HEALTHCARE
    OF CALIFORNIA PARTNER PLAN, INC.,
    a California corporation; ALAMEDA
    ALLIANCE FOR HEALTH, a business
    organization, form unknown;
    ANTHEM BLUE CROSS LIFE AND
    HEALTH INSURANCE COMPANY, a
    California corporation; BLUE CROSS
    OF CALIFORNIA, a California
    corporation,
    Defendants-Appellees.
    2         UNITED STATES EX REL. SILINGO V. WELLPOINT
    Appeal from the United States District Court
    for the Central District of California
    Fernando M. Olguin, District Judge, Presiding
    Argued and Submitted March 8, 2018
    Pasadena, California
    Filed July 9, 2018
    Before: Ronald M. Gould and Mary H. Murguia, Circuit
    Judges, and Jack Zouhary, * District Judge.
    Opinion by Judge Gould
    SUMMARY **
    False Claims Act
    The panel affirmed in part and reversed in part the
    district court’s dismissal of a False Claims Act suit against
    several Medicare Advantage organizations.
    Under Medicare Advantage’s “capitation” system,
    private health insurance organizations provide Medicare
    benefits in exchange for a fixed monthly fee per person
    enrolled in the program. These organizations pocket for
    themselves or pay out to their enrollees’ providers the
    *
    The Honorable Jack Zouhary, United States District Judge for the
    Northern District of Ohio, sitting by designation.
    **
    This summary constitutes no part of the opinion of the court. It
    has been prepared by court staff for the convenience of the reader.
    UNITED STATES EX REL.SILINGO V. WELLPOINT               3
    difference between their capitation revenue and their
    enrollees’ medical expenses. The Centers for Medicare and
    Medicaid Services sets capitation rates based on risk
    adjustment data, including enrollees’ medical diagnoses,
    reported by Medicare Advantage health insurance
    organizations. The plaintiff alleged that the defendant
    Medicare Advantage organizations retained Mobile Medical
    Examination Services, Inc. (MedXM) to fraudulently
    increase, or at least maintain, their capitation payments for
    enrollees whose risk scores were set to expire and revert to
    the unadjusted Medicare beneficiary average.
    The panel held that the district court erred in dismissing
    charges of factually false claims, express false certifications,
    and false records based on the plaintiff’s use of group
    allegations. The panel concluded that the plaintiff satisfied
    Federal Rule of Civil Procedure 9(b), which requires that the
    circumstances constituting fraud be stated with particularity,
    by pleading a wheel conspiracy-like fraud in which MedXM
    was the “hub” and the defendant Medicare Advantage
    organizations were “spokes” that largely engaged in the
    same conduct.
    The panel rejected the defendants’ argument that it
    should affirm the dismissal of the third amended complaint
    on the grounds that (1) the complaint failed to allege a
    sufficient factual basis to link MedXM’s misconduct to
    defendants’ actual submissions of claims or certifications to
    the Centers for Medicare and Medicaid Services; or (2) the
    complaint’s allegations about the Medicare Advantage
    organizations’ knowledge of the alleged fraud did not satisfy
    Rule 8.
    The panel affirmed the dismissal of a reverse false claim
    count that the plaintiff did not defend in response to
    4     UNITED STATES EX REL. SILINGO V. WELLPOINT
    defendants’ motions to dismiss. The panel reversed the
    dismissal on the pleadings of other counts and remanded for
    further proceedings on the plaintiff’s causes of action for
    factually false claims, express false certifications, and false
    records.
    COUNSEL
    Abram Jay Zinberg (argued), The Zinberg Law Firm A.P.C.,
    Huntington Beach, California; William K. Hanagami, The
    Hanagami Law Firm A.P.C., Woodland Hills, California; for
    Plaintiff-Appellant.
    David Jeffrey Leviss (argued) and Amanda M. Santella,
    O’Melveny & Myers LLP, Washington, D.C.; Elizabeth M.
    Bock, Sabrina Strong, and David Deaton, O’Melveny &
    Myers LLP, Los Angeles, California; Poopak Nourafchan
    and Michael M. Maddigan, Hogan Lovells LLP, Los
    Angeles, California; David J. Schindler, Latham & Watkins
    LLP, Los Angeles, California; Anne W. Robinson, Latham
    & Watkins LLP, Washington, D.C.; Paul C. Burkholder and
    David Jacobs, Epstein Becker & Green PC, Los Angeles,
    California; Pamela A. Stone and Michael J. Daponde,
    Daponde Szabo Rowe PC, Sacramento, California; for
    Defendants-Appellees.
    UNITED STATES EX REL.SILINGO V. WELLPOINT             5
    OPINION
    GOULD, Circuit Judge:
    Qui tam relator Anita Silingo appeals the dismissal of her
    False Claims Act suit against several Medicare Advantage
    organizations. We reverse in part, affirm in part, and
    remand.
    I
    Medicare Advantage is a modern adaptation of the
    momentous 1960s-era program. Traditional Medicare uses
    a fee-for-service payment model, whereby the more services
    physicians perform, the more money they earn. After
    Medicare was enacted, however, experts came to realize that
    this payment structure encourages healthcare providers to
    order more tests and procedures than medically necessary.
    See Thomas L. Greaney, Medicare Advantage, Accountable
    Care Organizations, and Traditional Medicare:
    Synchronization or Collision?, 15 Yale J. Health Pol’y, L. &
    Ethics 37, 38, 41 (2015).
    Medicare Advantage seeks to improve the quality of care
    while safeguarding the public fisc by employing a
    “capitation” payment system. Capitation means an amount
    is paid per person. Capitation, Black’s Law Dictionary
    (10th ed. 2014). Under Medicare Advantage’s capitation
    system, private health insurance organizations provide
    Medicare benefits in exchange for a fixed monthly fee per
    person enrolled in the program—regardless of actual
    healthcare usage. These organizations pocket for themselves
    or pay out to their enrollees’ providers the difference
    between their capitation revenue and their enrollees’ medical
    expenses, creating an incentive for the organizations to rein
    in costs. See Patricia A. Davis et al., Cong. Research Serv.,
    6     UNITED STATES EX REL. SILINGO V. WELLPOINT
    R40425, Medicare Primer 20 (2017), https://fas.org/sgp/crs/
    misc/R40425.pdf.
    Unfortunately, human nature being what it is, Medicare
    Advantage organizations also have some incentive to
    improperly inflate their enrollees’ capitation rates, if these
    organizations fall prey to greed. By design, Medicare
    Advantage is supposed to compensate these organizations
    for expected healthcare costs, paying “less for healthier
    enrollees and more for less healthy enrollees.”
    Establishment of the Medicare Advantage Program, 70 Fed.
    Reg. 4588, 4657 (Jan. 28, 2005). So capitation rates are
    based largely on an individual’s “risk adjustment data,”
    which reflect several factors that can affect healthcare costs.
    See 42 U.S.C. § 1395w-23(a)(1)(C)(i); 42 C.F.R.
    § 422.308(c). Chief among these data are individuals’
    medical diagnoses. See Policy and Technical Changes to the
    Medicare Advantage and the Medicare Prescription Drug
    Benefit Programs, 74 Fed. Reg. 54,634, 54,673 (Oct. 22,
    2009). Medicare Advantage organizations obtain diagnosis
    codes from healthcare providers after these providers have
    had medical visits with plan enrollees. See CMS, Pub. No.
    100-16, Medicare Managed Care Manual, ch. 7, § 40
    (2014), https://www.cms.gov/Regulations-and-Guidance/
    Guidance/Manuals/downloads/mc86c07.pdf.              In turn,
    Medicare Advantage organizations report the diagnosis
    codes that they receive to the Centers for Medicare and
    Medicaid Services (“CMS”) for use in the risk adjustment
    model that is the key to calculation of capitation rates. 
    Id. The risk
    adjustment model deems a Medicare Advantage
    enrollee to be as healthy as the average Medicare beneficiary
    unless CMS receives updated diagnosis codes for the
    enrollee every year. See 
    id. §§ 20,
    70, 70.2.5, 120.2.4.
    UNITED STATES EX REL.SILINGO V. WELLPOINT             7
    With data for millions of people being submitted each
    year, CMS is unable to confirm diagnoses before calculating
    capitation rates. Instead, the agency accepts the diagnoses
    as submitted, and then audits some of the self-reported data
    a few years later to ensure that they are adequately supported
    by medical documentation. See 42 C.F.R. §§ 422.310(e),
    422.311; Contract Year 2015 Policy and Technical Changes
    to the Medicare Advantage and the Medicare Prescription
    Drug Benefit Programs, 79 Fed. Reg. 1918, 2001 (Jan. 10,
    2014). These audits have revealed excess payments for
    unsupported diagnoses steadily increasing over the last
    decade, reaching an estimated $16.2 billion—nearly ten
    cents of every dollar paid to Medicare Advantage
    organizations—in 2016 alone. See James Cosgrove, U.S.
    Gov’t Accountability Office, GAO-17-761T, Medicare
    Advantage Program Integrity: CMS’s Efforts to Ensure
    Proper Payments and Identify and Recover Improper
    Payments 1 (2017), https://www.gao.gov/assets/690/
    685934.pdf; James Cosgrove, U.S. Gov’t Accountability
    Office, GAO-13-206, Medicare Advantage: Substantial
    Excess Payments Underscore Need for CMS to Improve
    Accuracy of Risk Score Adjustments 9–10 (2013),
    https://www.gao.gov/assets/660/651712.pdf.
    To combat the “incentive for [Medicare Advantage]
    organizations to potentially over-report diagnoses,”
    Medicare regulations require risk adjustment data to be
    produced according to certain best practices. Contract Year
    2015 Policy and Technical Changes to the Medicare
    Advantage and the Medicare Prescription Drug Benefit
    Programs, 79 Fed. Reg. 1918, 2001 (Jan. 10, 2014). Every
    diagnosis code submitted to CMS must be based on a “face-
    to-face” visit that is documented in the medical record.
    Medicare Managed Care Manual, ch. 7, §§ 40, 120.1.1.
    Medical records must be validated by qualifying
    8       UNITED STATES EX REL. SILINGO V. WELLPOINT
    “physician/practitioner signatures and credentials.” Policy
    and Technical Changes to the Medicare Advantage and the
    Medicare Prescription Drug Benefit Programs, 75 Fed. Reg.
    19,678, 19,743 (Apr. 15, 2010). Further, electronic medical
    records must meet special signature requirements and use
    software that is “protected against modification.” CMS,
    Pub. No. 100-08, Medicare Program Integrity Manual, ch.
    3, § 3.3.2.4 (2018), https://www.cms.gov/Regulations-and-
    Guidance/Guidance/Manuals/downloads/PIM83c03.pdf. 1
    Medicare regulations also establish several data
    certification requirements. Most important here, it is an
    express condition of payment that a Medicare Advantage
    organization “certify (based on best knowledge,
    information, and belief) that the [risk adjustment] data it
    submits . . . are accurate, complete, and truthful.” 42 C.F.R.
    § 422.504(l)(2). We have explained that a certification is
    thus false “when the Medicare Advantage organization has
    actual knowledge of the falsity of the risk adjustment data or
    demonstrates either ‘reckless disregard’ or ‘deliberate
    ignorance’ of the truth or falsity of the data.” United States
    ex rel. Swoben v. United Healthcare Ins. Co., 
    848 F.3d 1161
    ,
    1169 (9th Cir. 2016) (citing Medicare+Choice Program,
    65 Fed. Reg. 40,170, 40,268 (June 29, 2000)). The
    organization also is required to “[a]dopt and implement
    an effective compliance program, which must include
    measures that prevent, detect, and correct non-compliance
    with CMS’ program requirements,” such as written
    standards of conduct, the designation of a compliance
    1
    Though this chapter was recently updated, the relevant section has
    existed in the same form for several years. See, e.g., CMS, Pub. No. 100-
    08, Medicare Program Integrity Manual, ch. 3, § 3.3.2.4 (2012),
    https://web.archive.org/web/20120410201053/https://www.cms.gov/Re
    gulations-and-Guidance/Guidance/Manuals/downloads/PIM83c03.pdf.
    UNITED STATES EX REL.SILINGO V. WELLPOINT           9
    officer, and other listed minimum requirements. 42 C.F.R.
    § 422.503(b)(4)(vi). The importance of accurate data
    certifications and effective compliance programs is obvious:
    if enrollee diagnoses are overstated, then the capitation
    payments to Medicare Advantage organizations will be
    improperly inflated.
    The Medicare Advantage capitation payment system is
    subject to the False Claims Act. Originally enacted during
    the Civil War, the False Claims Act was intended to
    “forfend[] widespread fraud by government contractors.”
    United States ex rel. Hopper v. Anton, 
    91 F.3d 1261
    , 1265
    (9th Cir. 1996). The Act’s qui tam provisions allow a
    person—called a “relator”—to bring suit on the federal
    government’s behalf, and then share the recovered damages
    and civil penalties with the government. See United States
    ex rel. Kelly v. Boeing Co., 
    9 F.3d 743
    , 745–47 (9th Cir.
    1993). Liability attaches upon proof that a false claim for
    payment was made, regardless of whether the government
    suffered actual damage. United States ex rel. Aflatooni v.
    Kitsap Physicians Serv., 
    314 F.3d 995
    , 1002 (9th Cir. 2002).
    II
    Anita Silingo is a former Compliance Officer and
    Director of Provider Relations for Mobile Medical
    Examination Services, Inc. (“MedXM”). MedXM employs
    physicians, nurse practitioners, and physician assistants to
    conduct in-home health assessments of Medicare
    beneficiaries. Silingo alleges that from 2010 to 2014,
    MedXM contracted with the defendant Medicare Advantage
    organizations to provide up-to-date diagnosis codes and
    medical documentation for enrollees who otherwise may not
    have had an eligible medical encounter during a calendar
    year.
    10    UNITED STATES EX REL. SILINGO V. WELLPOINT
    In August 2013, Silingo filed an initial complaint against
    MedXM and the defendant Medicare Advantage
    organizations under the False Claims Act. In May 2014,
    Silingo filed her first amended complaint. The United States
    then declined to intervene, and in January 2015 Silingo filed
    a second amended complaint.
    The crux of the complaint is that the defendant Medicare
    Advantage organizations retained MedXM to fraudulently
    increase, or at least maintain, their capitation payments for
    enrollees whose risk scores were set to expire and revert to
    the unadjusted Medicare beneficiary average.
    First, Silingo claims that MedXM used inappropriate
    software so that it could edit health records to exaggerate
    medical diagnoses. Silingo alleges that MedXM’s in-home
    health assessment reports were prepared in Microsoft Word
    templates that are not “protected against modification,” and
    were signed by merely typing in the medical examiner’s
    name, which is not an acceptable electronic signature.
    Medicare Program Integrity Manual, ch. 3, § 3.3.2.4. Once
    in the hands of MedXM’s coders, these reports were
    allegedly modified to delete information showing little risk
    and insert new information to support diagnoses with higher
    risk scores. According to Silingo, MedXM then saved these
    reports as PDF files and submitted them to Medicare
    Advantage organizations as support for inflated risk
    adjustment data. Silingo asserts that all of MedXM’s health
    assessment reports violated CMS’s requirements for
    electronic medical records, and that more than half of them
    had been tampered with in this manner.
    Next, Silingo claims that MedXM’s fleet of mostly nurse
    practitioners and physician assistants were not legally
    authorized to make conclusive medical diagnoses, so their
    UNITED STATES EX REL.SILINGO V. WELLPOINT            11
    examinations could not support the risk adjustment data that
    was submitted. Before 2012, MedXM allegedly contracted
    directly with these healthcare providers without ensuring
    that they practiced under the supervision of licensed
    physicians. From 2012 to 2014, MedXM allegedly had
    contract physicians fraudulently sign standard care
    agreements with these non-physician providers without
    properly supervising their work.
    Silingo also claims MedXM systematically fabricated
    complex diagnoses that its medical examiners could not have
    possibly confirmed during an in-home assessment. The
    complaint identifies a variety of ailments—such as chronic
    obstructive pulmonary disease, hepatitis, and inflammatory
    bowel disease—that allegedly cannot be diagnosed without
    a spirometry test, biopsy, follow-up blood test, or other
    invasive procedure that MedXM’s examiners were
    unequipped and unauthorized to perform in a person’s home.
    Instead, Silingo alleges, MedXM’s medical examiners and
    coders simply recycled prior diagnoses and medical histories
    in the updated health assessment reports.
    Further, Silingo claims that MedXM regularly produced
    diagnostic information that was not the result of face-to-face
    medical encounters. By her estimation, in-home health
    assessments took about 45 minutes plus travel time and
    could be performed only within an 11-hour window, so
    MedXM’s medical examiners realistically could not perform
    more than 13 in-home health assessments per day. But
    Silingo alleges that many examiners consistently reported
    more than 15 assessments per day, with some reporting as
    many as 25. Silingo contends that these examiners boosted
    their assessment numbers by sometimes submitting identical
    vital statistics (age, weight, sex, and so on) for hundreds of
    enrollees, and only “correcting” these suspicious data entries
    12    UNITED STATES EX REL. SILINGO V. WELLPOINT
    when requested by Medicare Advantage organizations, by
    collecting information over the phone or having MedXM’s
    coders forge new data.
    A company offering in-home health assessment services
    has no intrinsic reason to overstate its findings. Rather, as
    Silingo alleges, MedXM went to the trouble of editing and
    forging medical records to provide its clients with more
    lucrative diagnosis codes—earning the Medicare Advantage
    organizations higher than warranted capitation payments.
    Silingo contends that the defendant Medicare Advantage
    organizations made false claims for payment by submitting
    MedXM’s risk adjustment data to CMS for several years,
    either with actual knowledge that the data were invalid or
    with reckless disregard or deliberate ignorance as to their
    validity. In doing so, the organizations allegedly violated the
    certification requirements of 42 C.F.R. § 422.504(l)(2),
    which is an express condition of payment. And Silingo
    contends that the failure to catch MedXM’s widespread
    fraud is evidence that these organizations did not have the
    effective compliance programs required by 42 C.F.R.
    § 422.503(b)(4)(vi), which is not an express condition of
    payment.
    Silingo advanced six theories of liability under the False
    Claims Act. She first charged that defendants violated
    31 U.S.C. § 3729(a)(1)(A) by making, or causing to be
    made, a claim for payment that is “factually false.” Mikes v.
    Straus, 
    274 F.3d 687
    , 697 (2d Cir. 2001), abrogated on other
    grounds by Universal Health Servs., Inc. v. United States ex
    rel. Escobar, 
    136 S. Ct. 1989
    (2016). A factually false claim
    is one in which “the claim for payment is itself literally false
    or fraudulent,” United States ex rel. Hendow v. Univ. of
    Phoenix, 
    461 F.3d 1166
    , 1170 (9th Cir. 2006), such as when
    UNITED STATES EX REL.SILINGO V. WELLPOINT             13
    the claim “involves an incorrect description of goods or
    services provided or a request for reimbursement for goods
    or services never provided,” 
    Mikes, 274 F.3d at 697
    .
    In addition, Silingo contended that defendants violated
    § 3729(a)(1)(A) by making claims that were “legally false.”
    
    Id. There are
    two cognizable theories of liability for legally
    false claims: express false certification and implied false
    certification. Express false certification involves an entity’s
    representation of compliance with the law as part of the
    process for submitting a claim when it is actually not
    compliant. United States ex rel. Ebeid v. Lungwitz, 
    616 F.3d 993
    , 998 (9th Cir. 2010). By contrast, “[i]mplied false
    certification occurs when an entity has previously
    undertaken to expressly comply with a law, rule, or
    regulation, and that obligation is implicated by submitting a
    claim for payment even though a certification of compliance
    is not required in the process of submitting the claim.” Id.;
    see also Escobar, 
    136 S. Ct. 1989
    (validating the implied
    false certification theory).
    Silingo next raised a false records claim under the
    following subparagraph, § 3729(a)(1)(B). Such a claim
    imposes liability where a party “knowingly makes, uses, or
    causes to be made or used, a false record or statement
    material to a false or fraudulent claim.” 31 U.S.C.
    § 3729(a)(1)(B).
    Silingo also alleged a violation of the False Claims Act’s
    “reverse false claim” provision, § 3729(a)(1)(G). That
    provision “is designed to cover Government money or
    property that is knowingly retained by a person even though
    they have no right to it.” S. Rep. No. 111-10, at 13–14
    (2009), reprinted in 2009 U.S.C.C.A.N. 430, 441.
    14    UNITED STATES EX REL. SILINGO V. WELLPOINT
    Finally, Silingo accused defendants of conspiring to
    violate the False Claims Act. See 31 U.S.C. § 3729(a)(1)(C).
    In February 2015, defendants separately moved to
    dismiss Silingo’s claims. Silingo opposed defendants’
    motions, but did not defend her count for reverse false
    claims. The district court held that the factually false claim
    cause of action against MedXM was well-pleaded under
    Federal Rules of Civil Procedure 8 and 9(b) because Silingo
    sufficiently alleged that MedXM caused false claims to be
    submitted to CMS. But the court dismissed Silingo’s
    abandoned reverse false claim count and conspiracy claim
    with prejudice, and dismissed her four remaining claims
    against the defendant Medicare Advantage organizations
    without prejudice. In the district court’s view, the latter
    claims were defective for using an impermissible “group-
    pleading.”
    Silingo filed a third amended complaint in October 2015.
    This time, Silingo separately pleaded her allegations against
    the Medicare Advantage organizations seriatim. Defendants
    promptly moved to dismiss the new complaint, and while
    these motions were pending, MedXM settled out of the case.
    The district court then dismissed Silingo’s claims against the
    Medicare Advantage organizations with prejudice on the
    ground that the allegations “remain undifferentiated.”
    Silingo timely appealed the dismissal of her causes of action
    for factually false claims, express false certifications, false
    records, and reverse false claims.
    III
    We review de novo a district court’s dismissal of a
    complaint under Federal Rule of Civil Procedure 12(b)(6),
    “accepting as true all well-pleaded allegations of fact in the
    complaint and construing them in the light most favorable to
    UNITED STATES EX REL.SILINGO V. WELLPOINT            15
    the Relator[].” United States v. Corinthian Colleges,
    
    655 F.3d 984
    , 991 (9th Cir. 2011) (citation and alterations
    omitted). We review for abuse of discretion a district court’s
    denial of leave to amend a complaint. 
    Id. at 995.
    In the usual case involving dismissal of a complaint, we
    must evaluate whether the factual allegations, together with
    all reasonable inferences, state a plausible claim to relief.
    Ashcroft v. Iqbal, 
    556 U.S. 662
    , 678 (2009).
    Rule 9(b), however, requires that “[i]n alleging fraud or
    mistake, a party must state with particularity the
    circumstances constituting fraud or mistake.” Fed. R. Civ.
    P. 9(b). To satisfy this requirement, a pleading must identify
    “the who, what, when, where, and how of the misconduct
    charged,” as well as “what is false or misleading about [the
    purportedly fraudulent] statement, and why it is false.”
    United States ex rel. Cafasso v. Gen. Dynamics C4 Sys., Inc.,
    
    637 F.3d 1047
    , 1055 (9th Cir. 2011) (quoting 
    Ebeid, 616 F.3d at 998
    ). This heightened pleading standard serves
    two main purposes. First, allegations of fraud “must be
    specific enough to give defendants notice of the particular
    misconduct which is alleged to constitute the fraud charged
    so that they can defend against the charge and not just deny
    that they have done anything wrong.” Bly-Magee v.
    California, 
    236 F.3d 1014
    , 1019 (9th Cir. 2001) (quotation
    marks and citation omitted). Second, the rule serves “to
    deter the filing of complaints as a pretext for the discovery
    of unknown wrongs, to protect [defendants] from the harm
    that comes from being subject to fraud charges, and to
    prohibit plaintiffs from unilaterally imposing upon the court,
    the parties and society enormous social and economic costs
    absent some factual basis.” 
    Id. at 1018
    (quotation marks and
    citation omitted).
    16    UNITED STATES EX REL. SILINGO V. WELLPOINT
    IV
    To satisfy Rule 9(b), a fraud suit against differently
    situated defendants must “identify the role of each defendant
    in the alleged fraudulent scheme.” Swartz v. KPMG LLP,
    
    476 F.3d 756
    , 765 (9th Cir. 2007) (citation and alterations
    omitted). In other words, when defendants engage in
    different wrongful conduct, plaintiffs must likewise
    “differentiate their allegations.” 
    Id. at 764
    (citation omitted).
    This rule is illustrated by Destfino v. Reiswig, 
    630 F.3d 952
    (9th Cir. 2011).          There, plaintiffs alleged that
    29 individuals, 10 businesses, and a church formed an
    intricate tax avoidance scheme, but the complaint did not
    “set out which of the defendants made which of the
    fraudulent statements/conduct.” 
    Id. at 954,
    958. We
    explained that in a situation like that in Destfino, with
    different actors playing different parts, it is not enough to
    “lump” together the dissimilar defendants and assert that
    “everyone did everything.” 
    Id. at 958
    (quoting 
    Swartz, 476 F.3d at 764
    –65). More is required to plead the
    circumstances of a fraud with particularity.
    On the other hand, a complaint need not distinguish
    between defendants that had the exact same role in a fraud.
    We recently addressed this issue in United States ex rel.
    Swoben v. United Healthcare Ins. Co., 
    848 F.3d 1161
    (9th
    Cir. 2016), which we decided a few months after the district
    court dismissed Silingo’s complaint. Swoben involved
    allegations of Medicare Advantage organizations—
    including several of the defendant organizations here—
    submitting false certifications of the accuracy,
    completeness, and truthfulness of the risk adjustment data
    they provided to CMS. 
    Id. at 1166–67.
    In a bit of deja vu,
    these Medicare Advantage organizations faulted the
    UNITED STATES EX REL.SILINGO V. WELLPOINT             17
    complaint there for using “collective allegations to refer to
    the defendants rather than differentiating among them.” 
    Id. at 1184.
    We dispensed with this argument, holding: “There
    is no flaw in a pleading . . . where collective allegations are
    used to describe the actions of multiple defendants who are
    alleged to have engaged in precisely the same conduct.” 
    Id. A good
    claim against one defendant did not become
    inadequate simply because a co-defendant was alleged to
    have committed the same wrongful acts.
    To better understand Swoben’s ruling, consider an
    analogy. In the taxonomy of conspiracy theories, a “chain
    conspiracy” is one in which “each person is responsible for
    a distinct act within the overall plan,” while a “wheel
    conspiracy” involves “a single member or group (the ‘hub’)
    separately agree[ing] with two or more other members or
    groups (the ‘spokes’).” Conspiracy, Black’s Law Dictionary
    (10th ed. 2014). Broadly speaking, if a fraudulent scheme
    resembles a chain conspiracy, then a complaint must
    separately identify which defendant was responsible for
    what distinct part of the plan. By contrast, if a fraudulent
    scheme resembles a wheel conspiracy, then any parallel
    actions of the “spokes” can be addressed by collective
    allegations.
    Applying Swoben here in light of these related
    principles, we observe that Silingo has pleaded a wheel
    conspiracy-like fraud in which MedXM was the “hub” and
    the defendant Medicare Advantage organizations were the
    “spokes.” Each of the defendant organizations allegedly had
    separate contracts with MedXM, and each of them allegedly
    passed on MedXM’s inflated diagnosis information in the
    same way. These organizations thus miss the mark when
    they implore us to consider that they are “unrelated,
    dissimilar defendants with no relevant business connections
    18       UNITED STATES EX REL. SILINGO V. WELLPOINT
    to one another and that [they] differ in size, geography, and
    member populations.” Because the Medicare Advantage
    organizations are largely “alleged to have engaged in
    precisely the same conduct,” there was no reason (and no
    way) for Silingo to differentiate among those allegations that
    are common to the group. 
    Swoben, 848 F.3d at 1184
    .
    Silingo’s charges of factually false claims, express false
    certifications, and false records should not have been
    dismissed due to her use of group allegations.
    V
    The defendant Medicare Advantage organizations
    contend that we should nevertheless affirm the dismissal of
    the third amended complaint based on arguments that the
    district court did not reach. We may affirm the dismissal on
    any ground supported by the record, even if the district court
    did not rely on that ground. Corinthian 
    Colleges, 655 F.3d at 992
    . The defendant organizations offer two such grounds:
    (1) that the complaint did not allege a sufficient factual basis
    to link MedXM’s misconduct to their actual submission of
    claims or certifications to CMS; and (2) that Silingo’s
    allegations about their knowledge of the fraud did not satisfy
    Rule 8. 2 We address these points in turn.
    2
    The defendant Medicare Advantage organizations also argue that
    as to the implied false certification claim, Silingo did not plead facts with
    the requisite particularity to show that the organizations lacked the
    compliance programs required by 42 C.F.R. § 422.503(b)(4)(vi). We
    need not address this argument, however, because Silingo has abandoned
    this claim on appeal by not challenging its dismissal “clearly and
    distinctly in the opening brief.” McKay v. Ingleson, 
    558 F.3d 888
    , 891
    n.5 (9th Cir. 2009).
    UNITED STATES EX REL.SILINGO V. WELLPOINT             19
    A
    The defendant Medicare Advantage organizations first
    contend that the complaint provides inadequate detail of
    their submission of false claims. When alleging a scheme to
    submit false claims, a plaintiff must provide “reliable indicia
    that lead to a strong inference that claims were actually
    submitted.” 
    Ebeid, 616 F.3d at 998
    –99 (quoting United
    States ex rel. Grubbs v. Ravikumar Kanneganti, 
    565 F.3d 180
    , 190 (5th Cir. 2009)). We do not require the complaint
    to identify representative examples of actual false claims,
    though that is one way to satisfy the heightened pleading
    requirement. 
    Id. We agree
    with the district court, in its analysis of the
    claims against MedXM, that Silingo has carried her burden
    here. The complaint asserts that the defendant Medicare
    Advantage organizations contracted with MedXM to
    provide health assessment reports and diagnosis codes for at
    least four years. Silingo details “first-hand experience of the
    scheme unfolding,” describing MedXM’s in-home
    assessments targeting Medicare Advantage enrollees who
    would otherwise lack risk adjustment data for a given year.
    
    Grubbs, 565 F.3d at 192
    . For this population, the Medicare
    Advantage organizations would face lower capitation
    payments if they did not procure and submit updated data.
    See Medicare Managed Care Manual, ch. 7, §§ 20, 70,
    70.2.5. Conversely, if they submitted data that overstated
    health problems in the diagnosis codes given, that would
    result in higher capitated payments to them. And as part of
    their requests for payment, Medicare Advantage
    organizations must certify that the data they submit are
    “accurate, complete, and truthful.”               42 C.F.R.
    § 422.504(l)(2). Taking Silingo’s allegations as true, as we
    must, we see ample circumstantial evidence from which to
    20    UNITED STATES EX REL. SILINGO V. WELLPOINT
    infer that the defendant organizations submitted MedXM’s
    risk adjustment data and certified the data’s validity to CMS.
    Indeed, “[i]t would stretch the imagination to infer the
    inverse.” 
    Grubbs, 565 F.3d at 192
    . Perhaps it would be
    possible that some Medicare Advantage organization, after
    paying for MedXM’s services, might have discovered the
    fraud and then cut ties with the company and thrown out its
    data. But the organizations here are alleged to have had
    multi-year relationships with MedXM, apparently
    encompassing thousands of examinations. There is no
    reason to believe that these companies consistently paid
    MedXM for data that they desperately needed but, time after
    time, did not actually use.
    The defendant Medicare Advantage organizations
    counter that Silingo did not sufficiently plead the “who,
    what, when, where, why” of their false claims, omitting
    allegations about their “claims filtering, verification, or
    submission processes or outcomes.” But these omissions do
    not justify dismissing the complaint for inadequate pleading.
    Rule 9(b) does not require a plaintiff to explain why a
    defendant committed fraud; the complaint simply must
    allege “the who, what, when, where, and how of the
    misconduct charged.” 
    Cafasso, 637 F.3d at 1055
    (quoting
    
    Ebeid, 616 F.3d at 998
    ) (emphasis added). Whatever their
    internal processes, Silingo alleges, the defendant
    organizations ultimately did submit false claims and
    certifications.
    B
    The next argument of the defendant Medicare Advantage
    organizations is that Silingo’s allegations about their
    knowledge of the alleged fraud are not plausible under
    Rule 8.
    UNITED STATES EX REL.SILINGO V. WELLPOINT             21
    To plead the element of knowledge under the False
    Claims Act, a relator must allege that a defendant knew a
    claim for payment was false, or that it acted with reckless
    disregard or deliberate indifference as to the truth or falsity
    of the claim. Corinthian 
    Colleges, 655 F.3d at 996
    ; see also
    31 U.S.C. § 3729(b)(1) (defining the terms “knowing” and
    “knowingly”). Although the circumstances of a fraud must
    be pleaded with particularity, knowledge may be pleaded
    generally. Fed. R. Civ. P. 9(b); see also Corinthian
    
    Colleges, 655 F.3d at 996
    . A complaint therefore must set
    out sufficient factual matter from which a defendant’s
    knowledge of a fraud might reasonably be inferred. See
    
    Iqbal, 556 U.S. at 678
    .
    Here, Silingo plausibly pleads that the defendant
    Medicare Advantage organizations submitted false claims
    and certifications and used false records with actual
    knowledge, reckless disregard, or deliberate ignorance of
    their falsity. The complaint details a variety of ways in
    which the defendant organizations knew, or reasonably
    should have known, that MedXM’s risk adjustment data
    were invalid.
    For one thing, Silingo claims that every health
    assessment report contained a typewritten signature only,
    violating the requirements for medical records underlying
    risk adjustment data. See Medicare Program Integrity
    Manual, ch. 3, § 3.3.2.4 (describing requirements for
    handwritten and electronic signatures); see also Policy and
    Technical Changes, 75 Fed. Reg. at 19,742 (“Medical
    records with missing signatures or credentials are scored as
    errors under [risk adjustment data validation] audit
    procedures.”). Similarly, Silingo contends that these errant
    signatures should have tipped off the defendant
    22    UNITED STATES EX REL. SILINGO V. WELLPOINT
    organizations that MedXM was editing its examiners’
    unsecured reports.
    For another, Silingo alleges that other parts of MedXM’s
    health assessment reports provided additional reasons for
    suspicion. According to the complaint, MedXM’s frequent
    use of nurse practitioners and physician assistants as
    examiners was a “serious red flag” because these
    practitioners are commonly known to be limited by law in
    their ability to make diagnoses. MedXM’s diagnosis codes
    themselves could have revealed the fraud because, as Silingo
    alleges, many complex diagnoses cannot be confirmed
    during brief and non-invasive in-home assessments. And
    Silingo claims that duplicative patient data were sometimes
    sent to the defendant organizations before being “corrected,”
    which would suggest that something was amiss.
    Taking all reasonable inferences in Silingo’s favor, see
    
    Iqbal, 566 U.S. at 678
    , there are still further grounds for
    concluding that the allegations of the defendant
    organizations’ knowledge, reckless disregard, or deliberate
    ignorance of the fraud is plausible. Even without the
    concrete signs detailed above, one would expect that a
    sophisticated company would notice when its contractor’s
    work is too good to be true. MedXM was allegedly
    obtaining worse-than-average diagnostic information from
    enrollees who did not otherwise visit a healthcare provider
    during a calendar year, and thus would not seem to be in such
    dire health. The defendant organizations’ materials show
    that the use of in-home assessments is controversial, with
    CMS repeatedly expressing interest in forbidding their use
    on the ground that they “contribute[] to increased risk scores
    and differences in coding patterns” between Medicare
    UNITED STATES EX REL.SILINGO V. WELLPOINT                23
    Advantage and traditional Medicare. 3 And all of these
    organizations had an incentive to pass along fraudulent data
    because, by overstating diagnoses, they could yield more
    revenue and profit under the capitated payment system—and
    it was not certain that they would get caught. That may not
    have been what was going on here, but the third amended
    complaint certainly states a plausible claim for knowingly
    participating in fraud, even as to the well-respected
    companies who are defending here.
    It is no defense that Silingo’s core allegations against the
    defendant Medicare Advantage organizations are all alike.
    If a group pleading against similarly situated defendants can
    satisfy Rule 9(b), then it can also satisfy the lesser notice
    pleading standard of Rule 8. See 
    Swoben, 848 F.3d at 1184
    .
    Silingo simply claims that all of the defendant organizations
    were equally put on notice by the warning signs that
    allegedly infected MedXM’s health assessment reports.
    These allegations, if true, give rise to the reasonable
    inference that the defendant organizations knowingly
    submitted false claims and used false records, or else acted
    3
    CMS, Advance Notice of Methodological Changes for Calendar
    Year (CY) 2015 for Medicare Advantage (MA) Capitation Rates, Part C
    and Part D Payment Policies and 2015 Call Letter 20 (Feb. 21, 2014),
    https://www.cms.gov/Medicare/Health-Plans/MedicareAdvtgSpecRate
    Stats/downloads/Advance2015.pdf; see also CMS, Advance Notice of
    Methodological Changes for Calendar Year (CY) 2014 for Medicare
    Advantage (MA) Capitation Rates, Part C and Part D Payment
    Policies and 2014 Call Letter 22–23 (Feb. 15, 2013),
    https://www.cms.gov/Medicare/Health-Plans/MedicareAdvtgSpecRate
    Stats/Downloads/Advance2014.pdf; CMS, Announcement of Calendar
    Year (CY) 2016 Medicare Advantage Capitation Rates and Medicare
    Advantage and Part D Payment Policies and Final Call Letter 144–45
    (Apr.     6,  2015),    https://www.cms.gov/Medicare/Health-Plans/
    MedicareAdvtgSpecRateStats/Downloads/Announcement2016.pdf.
    24     UNITED STATES EX REL. SILINGO V. WELLPOINT
    with reckless disregard or deliberate indifference of the
    falsity of these claims and records. See Corinthian 
    Colleges, 655 F.3d at 996
    . Because each Medicare Advantage
    organization must certify the validity of its data “based on
    best knowledge, information, and belief,” these same
    allegations also support Silingo’s express false certification
    claim. 42 C.F.R. § 422.504(l)(2); 
    Swoben, 848 F.3d at 1169
    .
    VI
    Silingo also appeals the dismissal of her second amended
    complaint’s count for a reverse false claim. But she did not
    defend this claim in response to the motions to dismiss, so
    she may not revive it on appeal. See Carvalho v. Equifax
    Info. Servs., LLC, 
    629 F.3d 876
    , 888 (9th Cir. 2010). And
    the district court did not abuse its discretion in denying leave
    to amend here because amendment could not have revived
    this abandoned claim. See Corinthian 
    Colleges, 655 F.3d at 995
    .
    VII
    For the reasons set forth above, we conclude that this
    case was mistakenly dismissed on the pleadings. Our
    decision rests on Silingo’s group pleadings, the primary
    focus of the district court decision and the parties’ appellate
    briefing and oral arguments. Although the defendant
    organizations also challenge Silingo’s additional allegations
    that are specific to each defendant, we see nothing to
    undermine our conclusion that the group pleadings alone are
    adequate. 4
    4
    At most, the defendant organizations contend that the allegations
    specific to Molina Healthcare, Inc. “contradicted [Silingo’s] more
    UNITED STATES EX REL.SILINGO V. WELLPOINT                      25
    Some discovery appears to have already taken place, but
    Silingo is entitled to continue taking discovery before her
    claims are resolved on summary judgment or at trial. We
    assuredly do not hold now that Silingo showed enough to get
    to trial, but rather only that her complaint is adequate to
    proceed to discovery. Accordingly, we REVERSE in part,
    AFFIRM in part, and REMAND for further proceedings on
    Silingo’s causes of action for factually false claims, express
    false certifications, and false records.
    general allegations elsewhere . . . for lack of oversight.” But the alleged
    contradiction concerns Silingo’s implied false certification claim, which
    is not at issue on appeal. See supra, note 2.