United States v. John McLean , 715 F.3d 129 ( 2013 )


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  •                        PUBLISHED
    UNITED STATES COURT OF APPEALS
    FOR THE FOURTH CIRCUIT
    UNITED STATES OF AMERICA,             
    Plaintiff-Appellee,
    v.                          No. 11-5130
    JOHN R. MCLEAN,
    Defendant-Appellant.
    
    Appeal from the United States District Court
    for the District of Maryland, at Baltimore.
    William D. Quarles, Jr., District Judge.
    (1:10-cr-00531-WDQ-1)
    Argued: February 1, 2013
    Decided: April 23, 2013
    Before GREGORY and KEENAN, Circuit Judges, and
    Robert E. PAYNE, Senior United States District Judge for
    the Eastern District of Virginia, sitting by designation.
    Affirmed by published opinion. Judge Gregory wrote the
    opinion, in which Judge Keenan and Senior Judge Payne
    joined.
    2                  UNITED STATES v. MCLEAN
    COUNSEL
    ARGUED: Richard W. Westling, WALLER, LANSDEN,
    DORTCH & DAVIS, Nashville, Tennessee, for Appellant.
    Sandra Wilkinson, OFFICE OF THE UNITED STATES
    ATTORNEY, Baltimore, Maryland, for Appellee. ON
    BRIEF: Mark M. Bell, Jessica R. Sievert, WALLER, LANS-
    DEN, DORTCH & DAVIS, Nashville, Tennessee; Carol M.
    McCarthy, OBER, KALER, GRIMES & SHRIVER, PC, Bal-
    timore, Maryland, for Appellant. Rod J. Rosenstein, United
    States Attorney, Mark W. Crooks, Assistant United States
    Attorney, Thomas F. Corcoran, Assistant United States Attor-
    ney, Michelle Purdy, Law Clerk, OFFICE OF THE UNITED
    STATES ATTORNEY, Baltimore, Maryland, for Appellee.
    OPINION
    GREGORY, Circuit Judge:
    John McLean, an interventional cardiologist, appeals his
    convictions and sentence for health care fraud and making
    false statements in connection with the delivery of or payment
    for health care services. The convictions arise from a scheme
    to defraud insurers by submitting claims for medically unnec-
    essary stent procedures. Among other arguments, McLean
    contends that there is insufficient evidence to support his con-
    victions. Although proof of a physician’s failure to meet med-
    ical standards, by itself, could not sustain a conviction for the
    federal offense of health care fraud, we find that here the evi-
    dence supports the jury’s verdict. Finding no reversible error,
    we affirm.
    I.
    During the relevant time period, McLean was in private
    practice in Salisbury, Maryland, and held privileges at Penin-
    UNITED STATES v. MCLEAN                 3
    sula Regional Medical Center ("PRMC"), where he performed
    cardiac catheterizations and coronary stent procedures. In the
    summer of 2006, PRMC began investigating McLean’s stent-
    ing practices after a quality control review revealed he had
    placed a stent in a coronary artery with no significant block-
    age, or "stenosis." An initial review showed that McLean had
    performed inappropriate stent procedures in 13 cases. After an
    outside contractor confirmed those findings, the hospital
    asked McLean to submit to a concurrent review procedure
    pending further investigation. McLean agreed, but subse-
    quently violated the procedure in three cases. Near the end of
    2006, the outside contractor confirmed that McLean had per-
    formed inappropriate stents in approximately half of 25 ran-
    domly selected cases. Shortly thereafter, McLean resigned his
    hospital privileges after informing PRMC that he had devel-
    oped an eye condition causing vision loss in one eye. In the
    ensuing months, McLean continued to see patients and review
    diagnostic test results in his office.
    In the spring of 2007, the United States subpoenaed 117
    patient files from McLean’s practice. After receiving informa-
    tion that the files were in peril, the government obtained a
    warrant to secure the records. When the FBI agents arrived at
    McLean’s office, they found subpoenaed files stacked on
    McLean’s desk and a shred bin nearby. McLean admitted that
    he was removing documents from the files for shredding.
    Following the conclusion of the government’s investiga-
    tion, McLean was indicted on one count of health care fraud
    in violation of 18 U.S.C. § 1347 (Count 1), and six counts of
    knowingly and willfully making false statements in connec-
    tion with the delivery of and payment for health care services
    in violation of 18 U.S.C. § 1035(a)(2) (Counts 2-7).1 In the
    health care fraud charge, the government alleged that McLean
    executed a scheme to defraud Medicare, Medicaid, and pri-
    vate insurers by submitting claims for medically unnecessary
    1
    Count 6 was dismissed on the government’s motion.
    4                      UNITED STATES v. MCLEAN
    procedures and testing. The false statement charges related to
    specific records in which McLean was alleged to have will-
    fully misrepresented the level of stenosis in patient arteries.
    At trial, the government supported its allegations with testi-
    mony from two expert cardiologists, PRMC staff who worked
    with McLean, and several of his former employees and
    patients. Both experts testified that during the relevant time
    period it was generally accepted in the medical community
    that coronary stents were not medically necessary absent a
    diagnosis of at least 70% stenosis and symptoms of blockage
    such as chest pain or a positive stress test. One of the experts,
    Dr. Ian Gilchrist, explained that although coronary artery dis-
    ease is considered significant when an artery is blocked by
    50%, stents are not medically necessary until the 70% thresh-
    old because that is the point when the body can no longer
    compensate for reduced blood flow to the heart.2 Gilchrist tes-
    tified that McLean had grossly overstated the level of block-
    age in the patient files he reviewed. A summary of 59 cases
    prepared by Gilchrist showed McLean often recorded stenosis
    of 80% to 95% for lesions of no more than 10% to 30%. Gil-
    christ testified specifically about 15 cases, explaining in detail
    how the stenosis shown in the angiograms was overstated in
    McLean’s records. Gilchrist further testified that in at least
    one case, McLean placed an appropriate stent, showing rea-
    sonable technique and "the ability to distinguish what should
    be done."
    The other expert, Dr. Joseph Cinderella, Director of the
    PRMC Cardiac Catheterization Laboratory, testified that he
    had reviewed the stent procedures McLean performed
    between 2003 and 2006 and ranked each procedure on a scale
    of one to five, where one meant medically appropriate and
    five meant inappropriate. Cinderella testified that the fours
    2
    The exception to that rule, Gilchrist testified, is the left main coronary
    artery, for which stenosis of 50% could justify a stent. None of the stent
    procedures at issue in this case involved the left main coronary artery.
    UNITED STATES v. MCLEAN                    5
    and fives were "pretty black and white"; four meant "most
    physicians would not proceed," and five meant "the consensus
    for pretty much anyone would be not . . . [to] proceed." Out
    of the 707 procedures he reviewed, Cinderella categorized
    101 procedures as fives and 108 as fours. Nonetheless, the
    evidence showed that McLean certified to insurers that these
    procedures were reasonable and medically necessary in order
    to obtain reimbursement.
    In addition, the jury heard testimony from PRMC staff who
    had seen McLean overstate the stenosis shown in angiograms.
    Nurse Paul Kenlon testified that on multiple occasions he dis-
    agreed with the percentage McLean recorded and that he
    remembered a couple of times when McLean said there were
    90% blockages and Kenlon "just simply could not see a lesion
    in the vessel." According to Kenlon, hospital staff used to sar-
    castically refer to healthy lesions that did not need interven-
    tion as "McLean 90 percenter[s]." Another nurse, Charlene
    Shellenberger, testified that McLean had placed stents in
    patients she had "a very difficult time being able to say . . .
    [had] a lesion that needed to be stented." In one case, after
    McLean stated that an artery had 99% stenosis, Shellenberger
    turned to his assistant and asked, "How can you ethically
    write that when you and I both know that is not a 99%
    lesion?"
    The jury also heard testimony from patients who had
    received medically unnecessary stents from McLean. Patient
    F.M. testified that he never experienced the chest discomfort
    McLean recorded in his medical records. Another patient,
    L.H., testified that McLean gave her a before-and-after pic-
    ture of her artery, which purported to show 97% blockage
    cleared by the stent. L.H. later learned that she never had any
    blockage. Her angiogram, which Gilchrist played for the jury,
    showed that the apparent blockage was actually a spasm of
    the artery, which subsided after McLean injected nitroglyc-
    erin.
    6                  UNITED STATES v. MCLEAN
    Witnesses also testified about McLean’s reaction to the
    investigation. In an early letter to PRMC, McLean acknowl-
    edged that although "[t]here is subjectivity reading the degree
    of stenosis, . . . standard practice is a lesion above 70% is felt
    to be significant and does receive intervention," but objected
    to the hospital’s review, quoting another doctor’s comment
    that "you do not second-guess the cardiologist who makes a
    decision in the cath lab at the time of the procedure." Accord-
    ing to Dr. Thomas Lawrence, Vice President of Medical
    Affairs at PRMC, McLean later called the investigation a
    "joke" and a "witch hunt." Carol Hales, a former employee of
    McLean, testified that McLean had blamed the investigation
    on other cardiologists at the hospital who were "[o]ut to get
    him." Another former employee, Candace Klopp, testified
    that McLean told his employees the hospital "held a gun to
    [his] head" to force him to resign his privileges. Patient C.L.
    testified that when she confronted McLean and asked him
    why he placed a stent in an artery with no blockage, McLean
    responded, "[B]ecause it was easy, why not?" And an FBI
    agent who executed the warrant at McLean’s office provided
    detail about his attempt to shred subpoenaed records.
    In addition, Dr. Jeffrey Weiland, Chief of the Division of
    Cardiology at PRMC, testified that prior to resigning from
    PRMC, McLean told him that the issues he was having may
    have been caused by his vision problems. However, Dr. Neil
    Miller, an expert neuro-ophthalmologist, testified that
    McLean’s vision loss in one eye was caused by a stroke of the
    optic nerve that occurred in October 2006 and would not have
    affected his vision prior to that time. Miller also testified that
    although McLean had another condition called drusen, which
    caused a minimal defect in his field vision, it was highly
    unlikely to have significantly impacted his ability to see
    because his central vision was normal. At the same time,
    numerous witnesses testified that McLean had claimed to
    have no trouble seeing. For instance, patient C.L. testified that
    McLean told her his eye condition didn’t affect what he did
    to her, and he could see "just fine," and Klopp testified that
    UNITED STATES v. MCLEAN                             7
    in spring 2007 McLean said to another employee, "I sit and
    watch and look at the cardio scans with you . . . have [I] ever
    read a scan wrong?"
    The government also offered peer comparison data, which
    showed that although a smaller proportion of McLean’s Medi-
    care patients received stents as compared to his peers, the
    patients McLean chose to stent received nearly twice as many
    stents on average as the patients of his peers.3 The evidence
    also showed that the number of stent reimbursement claims
    McLean submitted to Medicare increased dramatically in
    2004, around the same time he purchased a $1.7 million condo-
    minium.4 In addition, the government introduced a document
    from McLean’s office showing that patients generally were
    scheduled for stress tests every four to six weeks, three
    months, six months, and 12-18 months after stent interven-
    tions, a pattern confirmed by McLean’s billing data and testi-
    mony from his former employees and patients. Dr. Gilchrist
    testified that regular diagnostic testing of this kind is not med-
    ically necessary after a stent and that stress tests should only
    be ordered when a patient has symptoms such as chest pain.
    In his defense, McLean argued that the medical standard
    for coronary stents alleged by the government was incorrect,
    that the process of evaluating angiograms is highly subjective,
    3
    Specifically, between 2004 and 2006, 16 out of every 100 Medicare
    patients in McLean’s practice received a stent, a rate 67% below the aver-
    age in his peer group (defined as the top 25% of physicians billing for cor-
    onary stents in Maryland during that time period). However, while on
    average McLean’s peers placed 1.15 stents in each patient, McLean’s
    average per patient was 2.03.
    4
    According to the government’s data, McLean submitted Medicare
    claims for 92 stents placed in 63 patients in 2000; 85 stents placed in 57
    patients in 2003; 304 stents placed in 184 patients in 2004; 351 stents
    placed in 171 patients in 2005; and 175 stents placed in 97 patients in
    2006. On cross-examination, the government’s witness admitted that she
    did no work to determine whether the increase in 2004 was attributable to
    an increase in McLean’s patient load after two doctors left his practice.
    8                  UNITED STATES v. MCLEAN
    that McLean’s alleged error rate was not much higher than the
    rate shown in a recent study, and that McLean’s attempt to
    shred documents was not inculpatory because the documents
    in the shred bin—including records from other physicians, fax
    cover sheets, prescription refills, and test results—were not
    material to the investigation. The defense’s expert witness,
    Dr. Jonathan Marmur, testified that between 2003 and 2006
    elective stents were considered medically appropriate if a
    patient had at least 50% stenosis and evidence of ischemia or
    angina. Marmur testified that 4 out of the 5 cases named in
    the indictment met that standard of care. Further, although
    Marmur did not agree with the percentage of stenosis McLean
    recorded, he testified that some of the angiogram slides in
    those cases could support a higher percentage. The defense
    also offered testimony from former patients, including several
    named in the indictment, that McLean’s treatments relieved
    their symptoms, as well as testimony from former employees
    that McLean was an attentive doctor who cared about his
    patients.
    Following ten days of trial, the jury convicted McLean on
    all counts. McLean subsequently moved for a judgment of
    acquittal and a new trial, which the district court denied. Dur-
    ing sentencing, the district court applied a 16-level enhance-
    ment under United States Sentencing Guidelines
    § 2B.1.1(b)(1)(I) after calculating the total losses to be more
    than $1 million. The district court sentenced McLean to 97
    months imprisonment and three years supervised release, and
    entered forfeiture and restitution orders of $579,070.
    On appeal, McLean challenges his convictions on several
    grounds, arguing that the health care fraud statute is unconsti-
    tutionally vague as applied to him; that the evidence was
    insufficient to support his convictions on all counts; and that
    his trial was prejudiced by the government’s failure to dis-
    close impeachment evidence and certain erroneous evidenti-
    ary rulings committed by the district court. He also contends
    UNITED STATES v. MCLEAN                      9
    that the case should be remanded for resentencing because his
    sentence is procedurally unreasonable.
    II.
    McLean first argues that the health care fraud statute, 18
    U.S.C. § 1347, is unconstitutionally vague as applied to him
    because no clear standard of medical necessity governed the
    use of coronary artery stents during the relevant time period.
    We review the constitutionality of a statute de novo. United
    States v. Williams, 
    364 F.3d 556
    , 559 (4th Cir. 2004).
    A statute is unconstitutionally vague if it fails to provide
    people of ordinary intelligence a reasonable opportunity to
    understand what conduct it prohibits, or if it authorizes or
    encourages arbitrary and discriminatory enforcement. Hill v.
    Colorado, 
    530 U.S. 703
    , 732 (2000). Here, we ask whether an
    ordinary person would understand that the health care fraud
    statute prohibited McLean’s charged conduct. See United
    States v. Passaro, 
    577 F.3d 207
    , 218 (4th Cir. 2009) (explain-
    ing that vagueness challenges that lie outside of the First
    Amendment context must be evaluated based on the facts of
    the defendant’s case).
    The health care fraud statute makes it a crime to "know-
    ingly and willfully execute[ ] . . . a scheme . . . (1) to defraud
    any health care benefit program; or (2) to obtain, by means of
    false or fraudulent . . . representations . . . any of the money
    . . . [of] any health care benefit program . . . in connection
    with the delivery of or payment for health care benefits, items,
    or services." 18 U.S.C. § 1347. McLean argues that the statute
    is unconstitutionally vague as applied because no government
    standard or professional guideline defined the stenosis level
    needed to justify a coronary stent during the relevant time
    period, and the reading of angiograms is inherently subjective.
    As such, he claims he had no way of knowing in advance
    whether his conduct was prohibited. We disagree.
    10                     UNITED STATES v. MCLEAN
    The health care fraud statute is not a medical malpractice
    statute, it is a simple fraud statute. As applied here, it prohib-
    ited McLean from knowingly and willfully defrauding insur-
    ers by falsely certifying that the stents he placed in arteries
    with little to no blockage were reasonable and medically nec-
    essary in order to obtain reimbursement. Although the statute
    does not enumerate every possible fraud scheme, an average
    person would understand that this kind of conduct is prohib-
    ited. See United States v. Franklin-El, 
    554 F.3d 903
    , 910-11
    (10th Cir. 2009) (rejecting an analogous vagueness challenge
    to § 1347 premised on complexity in Medicaid regulations
    because the statute is simply a fraud statute).5 Further, the
    statute’s mens rea requirement mitigates any ambiguity aris-
    ing from the lack of clear medical guidance McLean alleges.
    See United States v. Jaensch, 
    665 F.3d 83
    , 90 (4th Cir. 2011)
    (rejecting vagueness challenge to federal statute prohibiting
    the production of false government identification documents
    based on statute’s scienter requirement). McLean could only
    be convicted if the government proved beyond a reasonable
    doubt that he acted "knowingly and willfully" to defraud
    insurers, which necessarily entails proof that he knew the
    stent procedures were unnecessary. This requirement of proof
    eliminates the fair notice concerns he raises. As a result, the
    health care fraud statute is not unconstitutionally vague as
    applied to McLean.6
    5
    Our reasoning is also consistent with an unpublished opinion of this
    Court, which we find persuasive. See United States v. Janati, 237 F.
    App’x 843, 846-47 (4th Cir. 2007) (unpublished) (rejecting vagueness
    challenge to health care fraud statute as applied to prohibit overbilling, and
    holding that the statute provides fair notice that overbilling is prohibited
    even though the billing manual may lack clarity).
    6
    In urging otherwise, McLean cites an unpublished decision of the Fifth
    Circuit, which dealt with a similar vagueness challenge to the health care
    fraud statute based on subjectivity in the standard of medical necessity for
    coronary artery stents. See United States v. Patel, 485 Fed. App’x 702,
    707 (5th Cir. 2012) (unpublished). This case does not provide much sup-
    port for McLean. Although the Patel court recognized that the defendant’s
    vagueness concerns were not "insubstantial," the court ultimately rejected
    his arguments because the evidence showed that the concept of medical
    necessity meant something concrete to the defendant. 
    Id. The same can
    be
    said of this case, as McLean’s letter to the hospital indicates he was aware
    of the 70% threshold.
    UNITED STATES v. MCLEAN                   11
    III.
    McLean next argues that his convictions on all counts are
    unsupported by sufficient evidence. We review the suffi-
    ciency of the evidence de novo. United States v. Ryan-
    Webster, 
    353 F.3d 353
    , 359 (4th Cir. 2003). "A defendant
    bringing a sufficiency challenge must overcome a heavy bur-
    den, and reversal for insufficiency must be confined to cases
    where the prosecution’s failure is clear." United States v.
    Engle, 
    676 F.3d 405
    , 419 (4th Cir. 2012) (internal quotation
    marks and citations omitted). Our review is limited to deter-
    mining whether, viewing the evidence in the light most favor-
    able to the government, the jury’s verdict is supported by
    "substantial evidence," that is, "evidence that a reasonable
    finder of fact could accept as adequate and sufficient to sup-
    port a conclusion of a defendant’s guilt beyond a reasonable
    doubt." United States v. Burgos, 
    94 F.3d 849
    , 862 (4th Cir.
    1996) (en banc). We are mindful that "the jury, not the
    reviewing court, weighs the credibility of the evidence and
    resolves any conflicts in the evidence presented, and if the
    evidence supports different, reasonable interpretations, the
    jury decides which interpretation to believe." 
    Id. (internal quotation marks,
    alterations, and citation omitted).
    A.
    McLean first challenges the sufficiency of the evidence as
    to the health care fraud charge (Count 1). To sustain a convic-
    tion under 18 U.S.C. § 1347, the government was required to
    prove beyond a reasonable doubt that McLean knowingly and
    willfully executed a scheme to defraud insurers by billing for
    medically unnecessary procedures. "[T]he specific intent to
    defraud may be inferred from the totality of the circumstances
    and need not be proven by direct evidence." United States v.
    Harvey, 
    532 F.3d 326
    , 334 (4th Cir. 2008) (internal quotation
    marks, alteration, and citation omitted). After carefully
    reviewing the record, we conclude that substantial evidence
    supports McLean’s conviction.
    12                    UNITED STATES v. MCLEAN
    To begin, McLean’s pattern of overstating blockage by a
    wide margin and placing unnecessary stents in a large number
    of cases was direct evidence of a fraudulent scheme. Accord-
    ing to Dr. Cinderella, over 100 of McLean’s cases involved
    blockage of 25% or less. And Dr. Gilchrist testified that
    McLean grossly overstated blockage in the 59 procedures he
    reviewed. For example, patient AW had 0% blockage, and
    McLean recorded it as 80% to 90%. Similarly, patient DD had
    10% blockage, and McLean recorded it as 80%. McLean sub-
    sequently sought reimbursement from insurers, certifying that
    the procedures were reasonable and medically necessary
    based on the falsely recorded stenosis levels. The stark dispar-
    ity between what McLean recorded and what the angiogram
    showed strongly suggests he intentionally committed fraud.
    There was also sufficient evidence to rule out non-criminal
    explanations for McLean’s overstatements. Gilchrist testified
    that the skill McLean displayed in an appropriate stent proce-
    dure demonstrated reasonable technique and the ability to dis-
    cern appropriate treatment, undermining the possibility that
    McLean was simply a negligent physician. Dr. Miller, the
    expert neuro-ophthalmologist, testified that the optic stroke
    McLean suffered in his left eye in October 2006 would not
    have affected his vision in years prior and that his preexisting
    drusen was highly unlikely to have significantly affected his
    ability to see because it caused only a minor field defect and
    did not affect his central vision.7 Based on his testimony, a
    rational juror could exclude McLean’s eye conditions as an
    explanation for his blockage overstatements. Finally, although
    Gilchrist admitted that angiogram reading is subjective, he
    testified that physicians should be in the same ballpark and
    inter-reviewer variability should not exceed 10% to 20%.
    Both Gilchrist and Cinderella testified that the cases at issue
    were not borderline cases where inter-reviewer variability
    7
    Although Miller could not test the effect of the drusen on McLean’s
    left eye due to the optic stroke, his opinion was based on the effect of the
    drusen on his right eye because the drusen was symmetrical in both eyes.
    UNITED STATES v. MCLEAN                   13
    would come into play. And the jury viewed many of the
    angiograms themselves, providing them an opportunity to
    determine whether they were within the borderline area where
    subjectivity could account for McLean’s overstatements.
    Based on this evidence, the jury could reasonably exclude the
    phenomenon of inter-reviewer variability as an explanation
    for McLean’s conduct.
    McLean nonetheless argues that the government’s pattern
    evidence is not probative of fraud because a 2009 – 2010
    study published in the Journal of the American Medical Asso-
    ciation found that 12% of stents performed nationwide were
    medically unnecessary. He argues that his own error rate was
    not much higher, as the Cinderella fives constituted only 15%
    of the total stent procedures he performed between 2003 and
    2006. We are not persuaded that this study undermines the
    government’s pattern evidence. First, if the Cinderella fours
    are included, McLean’s error rate was approximately 30%,
    not 15%. But more importantly, the import of the pattern evi-
    dence is not simply that McLean repeatedly performed medi-
    cally unnecessary stents, but rather that he repeatedly
    overstated blockage by a wide margin. Indeed, we do not
    believe that pattern evidence showing that a physician placed
    more unnecessary stents than the national average necessarily
    would be probative of fraud, for such a pattern might only
    suggest negligence. The distinction here is that McLean
    repeatedly overstated blockage by a margin well beyond the
    normal variation between observers. McLean cites nothing
    from the study showing that his pattern of misrepresentation
    was comparable to the conduct of other physicians nation-
    wide. As a result, the study does not undermine the weight of
    the pattern evidence described above.
    Moreover, even assuming the study McLean cites calls into
    question the strength of the government’s pattern evidence,
    separate evidence of fraud provided a substantial basis for the
    conviction. Tellingly, McLean told patient C.L. that he placed
    a stent in an artery with no blockage "because it was easy,"
    14                 UNITED STATES v. MCLEAN
    not because he saw blockage. That statement implies he knew
    the stent was unnecessary and the blockage he recorded was
    false. Additionally, the evidence indicates McLean made
    other misrepresentations to create the illusion of medical
    necessity. He gave patients misleading pictures purporting to
    show cleared blockage when the angiogram, viewed in full,
    showed no significant blockage. In L.H.’s case, the apparent
    blockage was actually a spasm of the artery, which McLean
    knew occurred because he treated it. McLean also recorded
    symptoms patients did not experience. For instance, patient
    F.M. testified that he never experienced the chest discomfort
    McLean recorded. And in two of the cases named in the
    indictment, medical records showed that patients had previ-
    ously denied symptoms, such as chest pain, which McLean
    nevertheless recorded after the stent procedures were com-
    pleted. McLean also gave inconsistent explanations for his
    conduct, suggesting on at least one occasion to Dr. Weiland
    that his eye condition had caused the inappropriate stents, but
    insisting on many other occasions to patients and employees
    that his vision was fine. These inconsistencies reasonably sug-
    gest that McLean falsely blamed his conduct on his eye condi-
    tion to cover up his true fraudulent intent. See United States
    v. Hughes, 
    716 F.2d 234
    , 240-41 (4th Cir. 1983) (noting that
    a defendant’s inconsistent alibi statements can be probative of
    illicit intent). Finally, McLean attempted to shred patient files
    subpoenaed by the United States. McLean argues that this
    incident was not probative of fraud because he was honest
    about what he was doing, and the documents found in the
    shred bin were not material to the investigation. However,
    viewing the evidence in the light most favorable to the gov-
    ernment, as we must, a reasonable juror could conclude
    McLean had something to hide, even if his motives for select-
    ing particular documents are unclear.
    There was also sufficient evidence to prove McLean had a
    financial motive for the fraudulent scheme. McLean received
    reimbursement for each stent procedure he performed, as well
    as for a series of regularly scheduled diagnostic tests after the
    UNITED STATES v. MCLEAN                          15
    procedure, which were administered to patients at his office
    pursuant to standing orders.8 This evidence showed that stent-
    ing provided a significant source of reimbursement for
    McLean’s private practice, and thus, that he had a financial
    motive for executing the fraudulent scheme.
    Based on the direct evidence that McLean overstated block-
    age in numerous cases, his pattern of misleading patients and
    making other misrepresentations in patient files, his admission
    to C.L. that he placed an unnecessary stent "because it was
    easy," his inconsistent explanations for his conduct, his
    attempt to shred patient files, and the circumstantial evidence
    of a financial motive, we hold that McLean’s health care
    fraud conviction is supported by substantial evidence.
    McLean’s two remaining challenges to the evidence do not
    persuade us otherwise. First, McLean argues that the govern-
    ment’s peer comparison evidence was actually exculpatory.
    The government used the evidence to show that McLean
    placed twice as many stents on average in each patient he
    chose to stent as his peers. As McLean notes, however, the
    evidence also showed that McLean only stented 16 out of 100
    patients in his practice, a rate 67% lower than the average of
    his peers. We are not persuaded that this evidence is exculpa-
    tory. The peer comparison evidence simply compared the
    number of stent procedures McLean performed to the average
    of his peers; it said nothing about the necessity of those proce-
    dures. As such, its probative value was marginal at best. Even
    construing the evidence as McLean urges, proof that he
    stented less patients on average than his peers does not under-
    mine the other evidence of fraud outlined above.
    Second, McLean argues that the evidence of his condomin-
    8
    McLean argues that the government failed to prove beyond a reason-
    able doubt that standing orders existed. However, billing data and testi-
    mony from patients and staff provided a sufficient basis for the jury to
    make this finding.
    16                 UNITED STATES v. MCLEAN
    ium purchase was not adequate to prove a financial motive
    because the funds he received from stent procedures consti-
    tuted a small fraction of the purchase price. We agree with
    McLean that this evidence is not particularly probative. A
    condominium purchase is hardly evidence of a financial
    motive to commit fraud; it is a personal financial decision that
    falls well within the bounds of law-abiding conduct. How-
    ever, as explained above, there was separate evidence show-
    ing that McLean benefitted financially from the unnecessary
    stent procedures and follow-up diagnostic tests he performed.
    Thus, even setting aside the condominium purchase, there was
    sufficient evidence to show McLean had a financial motive to
    commit fraud.
    For these reasons, we hold that McLean’s health care fraud
    conviction is supported by substantial evidence.
    B.
    McLean next challenges the sufficiency of the evidence as
    to the false statement charges (Counts 2-5, 7). To sustain a
    conviction under 18 U.S.C. § 1035, the government was
    required to prove beyond a reasonable doubt that McLean
    "knowingly and willfully . . . ma[de] . . . materially false . . .
    or fraudulent statements . . . in connection with the delivery
    of or payment for health care benefits, items, or services." 18
    U.S.C. § 1035. The specific intent to defraud may be inferred
    from the totality of the circumstances, and need not be proven
    by direct evidence. 
    Harvey, 532 F.3d at 334
    .
    Dr. Gilchrist testified about the cases cited in the indict-
    ment and explained to the jury how McLean overstated the
    level of stenosis in each case. Even McLean’s own expert, Dr.
    Marmur, disagreed with the stenosis diagnoses McLean
    recorded, although he testified that some slides could support
    a higher reading. Given the sheer disparity between the steno-
    sis McLean recorded and what the angiograms showed, and
    the other evidence of fraud outlined above, there was suffi-
    UNITED STATES v. MCLEAN                    17
    cient evidence for the jury to conclude that McLean intention-
    ally overstated stenosis levels in the patient files named in the
    indictment. Further, the evidence showed that these misrepre-
    sentations were material insofar as they were necessary for
    McLean to justify the stents and obtain reimbursement from
    insurers.
    McLean’s challenge to the sufficiency of the evidence on
    these counts is based on the same arguments he raises with
    respect to the health care fraud charge. He argues that the
    government failed to prove that his misrepresentations were
    intentional and that he was not simply a negligent physician,
    and that the phenomenon of inter-reviewer variability and his
    vision problems could explain his overstatements. As dis-
    cussed above, however, there was sufficient evidence from
    which the jury could rule out these non-criminal explanations
    for his conduct.
    For these reasons, we hold that there is substantial evidence
    to support the false statement convictions.
    C.
    Lastly, McLean argues that the evidence was insufficient as
    to all counts because the government failed to prove beyond
    a reasonable doubt that an objective standard of medical
    necessity existed. There was ample evidence, however, that a
    standard existed. Both government experts testified that stents
    are not justified unless there is 70% or more stenosis in an
    artery and the patient suffers from symptoms of blockage.
    McLean was aware of this standard because he referenced it
    in a letter to the hospital. Although Dr. Marmur disagreed
    with the minimum threshold of stenosis required to justify a
    stent, he agreed with the government’s experts that stents are
    contraindicated in cases of less than 50% stenosis. At a mini-
    18                     UNITED STATES v. MCLEAN
    mum, the evidence clearly showed that stents are objectively
    unnecessary in cases of less than 50% stenosis.9
    IV.
    McLean next argues that his trial was prejudiced by the
    government’s failure to disclose impeachment evidence and
    by certain evidentiary and discovery rulings committed by the
    district court. We do not believe a new trial is warranted
    based on these assertions of error for the reasons stated below.
    A.
    Shortly after McLean’s trial, the government issued a press
    release stating that it had reached an agreement with PRMC
    to settle a civil fraud investigation of the hospital for being
    aware of and failing to take action to prevent McLean’s medi-
    cally unnecessary procedures. Subsequent disclosures
    revealed that the parties had reached a handshake settlement
    months before. McLean argues that the government’s failure
    to disclose this information to him before trial violated his due
    process rights because he could have used the information to
    impeach the PRMC witnesses. In particular, he argues that the
    evidence would have allowed him to explore Dr. Cinderella’s
    motivations for testifying and to probe bias, thereby under-
    mining the credibility of a key witness.
    The due process clause of the Fifth Amendment requires
    the government to disclose favorable impeachment evidence
    to the defendant. See Brady v. Maryland, 
    373 U.S. 83
    , 87
    (1963) (holding that due process requires the disclosure of
    9
    McLean points out that Dr. Gilchrist sometimes referred to 50% steno-
    sis when explaining why a particular stent was inappropriate, arguing that
    his reference to something other than the 70% threshold highlights the
    inadequacy of proof on this issue. Dr. Gilchrist, however, testified that
    stents are contraindicated at stenosis less than 50%, and we do not find his
    reference to that threshold in individual cases inconsistent with his opinion
    that stents are generally necessary only after stenosis reaches 70%.
    UNITED STATES v. MCLEAN                    19
    evidence favorable to the accused and material to guilt or pun-
    ishment); Giglio v. United States, 
    405 U.S. 150
    , 154-55
    (1972) (including impeachment evidence within the scope of
    materials that Brady requires prosecutors to disclose). A due
    process violation occurs when (1) the evidence is favorable to
    the accused because it is exculpatory or impeaching; (2) the
    evidence was suppressed by the government, either willfully
    or inadvertently; and (3) the evidence is material. United
    States v. Moussaoui, 
    591 F.3d 263
    , 285 (4th Cir. 2010). To be
    material, there must be a reasonable probability that disclo-
    sure of the evidence would have produced a different out-
    come. Kyles v. Whitley, 
    514 U.S. 419
    , 434 (1995).
    We find no due process violation here because the settle-
    ment information had little impeachment value, and there was
    no reasonable probability it would have affected the jury’s
    verdict. Neither Cinderella nor any other PRMC witness was
    a party to the settlement, and they did not agree to testify in
    exchange for the release of the government’s claims against
    the hospital—the impeachment value of the information was
    therefore minimal. If anything, disclosure of the settlement to
    the jury likely would have bolstered the government’s case,
    for the hospital’s liability was based entirely on its failure to
    prevent McLean’s misconduct. Finally, even assuming the
    settlement had some impeachment value, the jury’s verdict
    could have rested on the testimony from Dr. Gilchrist and the
    many other former employees and patients who testified at
    trial. We cannot say there is a reasonable probability that dis-
    closure of the settlement would have altered the jury’s verdict.
    B.
    The day before McLean’s expert was scheduled to testify,
    the district court allowed the government to conduct voir dire
    on him to remedy McLean’s failure to provide adequate dis-
    closures under Federal Rule of Criminal Procedure 16.
    McLean argues that the court’s ruling was erroneous and that
    it deprived him of a fair trial.
    20                 UNITED STATES v. MCLEAN
    We review the district court’s decision as to the appropriate
    remedy for a violation of Rule 16 for abuse of discretion.
    United States v. Barile, 
    286 F.3d 749
    , 759 (4th Cir. 2002). A
    court abuses its discretion if its decision is "guided by errone-
    ous legal principles" or "rests upon a clearly erroneous factual
    finding." United States v. Johnson, 
    617 F.3d 286
    , 292 (4th
    Cir. 2010) (internal quotation marks and citation omitted).
    Rule 16 imposes mutual obligations on the prosecution and
    the defendant to disclose, at the other party’s request, a writ-
    ten summary of any expert testimony that will be used at trial.
    The summary must describe the expert’s opinions and "the
    bases and reasons for those opinions." Fed. R. Crim. P.
    16(b)(1)(C); 
    id. 16(a)(1)(G). If a
    party fails to comply with
    this rule, the court may "prohibit that party from introducing
    the undisclosed evidence" or "enter any other order that is just
    under the circumstances." 
    Id. 16(d)(2)(C). On June
    24, 2011, three weeks before trial, McLean
    informed the government that Dr. Marmur would be testifying
    at trial and provided a Rule 16 disclosure describing his testi-
    mony. The disclosure stated that Marmur would testify that in
    five cases he had reviewed, McLean’s stent treatment met the
    "interventional cardiology standard of care." Four days later,
    the government asked McLean to clarify the definition of the
    "interventional cardiology standard of care" and the bases and
    reasons for Marmur’s opinions. McLean did not respond. As
    a result, on July 17, 2011, the government moved the court to
    exclude Marmur’s testimony regarding the five cases. On July
    20, 2011, the day the defense case began, the court considered
    the government’s motion. Rather than excluding Marmur’s
    testimony, the court gave the government the option to con-
    duct voir dire of Marmur the next morning.
    We see no abuse of discretion in this ruling. Because
    McLean’s Rule 16 disclosure did not describe Marmur’s opin-
    ions "beyond stating the conclusion he had reached and did
    not give the reasons for those opinions as required under Rule
    UNITED STATES v. MCLEAN                    21
    16(b)(1)(C)," the disclosure did not satisfy the rule. 
    Barile, 286 F.3d at 758
    . It was not an abuse of discretion to allow the
    government voir dire, especially given the fact that Marmur
    was scheduled to testify the following day. See 
    id. ("Upon finding a
    violation of Rule 16, the district court has discretion
    under the Federal Rules of Criminal Procedure to determine
    the proper remedy.") (citing Fed. R. Crim. P. 16(d)(2); United
    States v. Muse, 
    83 F.3d 672
    , 675 (4th Cir. 1996)). By that
    point, the government’s need to discover the bases and rea-
    sons for his opinions was pressing, and there was no excuse
    for McLean’s delay.
    C.
    McLean also argues that the district court erroneously sus-
    tained the government’s objection to several aspects of Dr.
    Marmur’s testimony. Specifically, McLean argues that the
    district court erred in excluding Marmur’s testimony on: (1)
    the medical necessity of follow-up tests post-stent interven-
    tion; (2) the treatment McLean gave other patients beyond
    those named in the Rule 16 disclosure; (3) the Journal of
    American Medicine Association article showing a national
    error rate of 12% in stent procedures; and (4) that four of the
    five cases named in the indictment met the interventional car-
    diology standard of care, in part, because Marmur had seen
    other doctors perform similar stents. We review the district
    court’s evidentiary rulings for abuse of discretion. United
    States v. Basham, 
    561 F.3d 302
    , 325 (4th Cir. 2009). Eviden-
    tiary rulings are subject to harmless error review under Fed-
    eral Rule of Criminal Procedure 52. United States v. Heater,
    
    63 F.3d 311
    , 325 (4th Cir. 1995). To find a district court’s
    error harmless, we need only say "with fair assurance, after
    pondering all that happened without stripping the erroneous
    action from the whole, that the judgment was not substantially
    swayed by the error." 
    Id. (internal quotation marks
    and cita-
    tion omitted).
    With respect to the first two topics, we find no abuse of dis-
    cretion because McLean did not provide notice that Marmur
    22                 UNITED STATES v. MCLEAN
    planned to testify on these subjects as required by Rule 16.
    See Fed. R. Crim. P. 16(d)(2)(C) (allowing courts to exclude
    undisclosed evidence to remedy a Rule 16 violation); 
    Barile, 286 F.3d at 758
    -59 (finding no abuse of discretion in district
    court’s decision to exclude part of expert’s testimony based
    on defendant’s failure to provide adequate notice of the testi-
    mony under Rule 16).
    As for the journal article, assuming without deciding that
    the court abused its discretion, any error was harmless.
    McLean introduced the study during his cross-examination of
    Dr. Gilchrist, and defense counsel relied on it during closing
    argument, emphasizing that the error rate discovered was
    12%. Because the pertinent evidence from the study was
    introduced through other means, we can say with fair assur-
    ance that the jury’s verdict was not swayed by the district
    court’s ruling.
    As for the last topic, the government’s voir dire revealed
    that there were two bases for Marmur’s opinion that the stan-
    dard of care was met in four of the five cases he reviewed: (1)
    that the patients had at least 50% stenosis and symptoms or
    evidence of ischemia; and (2) that he had seen other doctors
    perform similar stents. The district court sustained the govern-
    ment’s objection to the latter basis for Marmur’s opinion, rea-
    soning that Marmur’s personal observations were not
    sufficiently reliable to be admissible under Federal Rule of
    Evidence 702. See Fed. R. Ev. 702 (providing that admissible
    expert testimony must be "the product of reliable principles
    and methods"); Daubert v. Merrell Dow Pharmaceuticals,
    Inc., 
    509 U.S. 579
    , 592-93 (1993) (holding that district courts
    must make a preliminary assessment of whether the reasoning
    or methodology underlying an expert’s testimony is scientifi-
    cally valid and can be applied to the facts in issue).
    McLean argues that this ruling was an abuse of discretion
    because medical standards of care are defined, in part, by the
    behavior of physicians in the relevant medical community.
    UNITED STATES v. MCLEAN                    23
    We need not decide whether the court’s ruling was an abuse
    of discretion because even assuming it was erroneous, any
    error was harmless. The court allowed Marmur to testify that
    the standard of care was met in the four cases because the
    objective criteria he referenced (50% stenosis plus symptoms
    or evidence of ischemia) were satisfied. That an additional
    explanation for his opinion was excluded did not detract from
    the ultimate point of his testimony, which was that in his
    opinion, the stents were within the standard of care. We see
    no prejudice resulting from the district court’s decision.
    V.
    Finally, McLean argues that his sentence is procedurally
    unreasonable because the district court erred in calculating the
    loss amount. We review the sentence imposed by the district
    court under "a deferential abuse-of-discretion standard," Gall
    v. United States, 
    552 U.S. 38
    , 41 (2007), applying clear error
    review to the district court’s finding of fraud loss, United
    States v. Pierce, 
    409 F.3d 228
    , 234 (4th Cir. 2005).
    In calculating the appropriate sentence, the Sentencing
    Guidelines allow the district court to consider as relevant con-
    duct the acts of the defendant, as well as the acts "willfully
    caused by the defendant" and "all harm that resulted from the
    acts and omissions." U.S.S.G. § 1B1.3. In deciding whether to
    apply an enhancement under Guidelines § 2B.1.1, the district
    court "need only make a reasonable estimate of the loss,"
    U.S.S.G. § 2B1.1, cmt. n.3(C), based on a preponderance of
    the evidence, see United States v. Mehta, 
    594 F.3d 277
    , 282
    (4th Cir. 2010). Because the traditional rules of evidence are
    not applicable to sentencing proceedings, Fed. R. Evid.
    1101(d)(3), the sentencing court may consider any "relevant
    information . . . [that] has sufficient indicia of reliability to
    support its probable accuracy," U.S.S.G. § 6A1.3(a).
    To establish the amount of loss, the government submitted
    evidence showing that from 2003 to 2006, McLean received
    24                    UNITED STATES v. MCLEAN
    $579,070 in reimbursement from Medicare and private insur-
    ers for the unnecessary stent procedures and related follow-up
    tests. Mary Hammond, an auditor from the U.S. Attorney’s
    Office, testified that the number of unnecessary stent proce-
    dures was calculated as the sum of procedures Dr. Cinderella
    categorized as fours and fives. Hammond also testified the
    hospital repaid $1.3 million to federal programs in connection
    with the settlement, which corresponded to reimbursement it
    received for hospital facilities used in McLean’s unnecessary
    stent procedures. For purposes of the settlement, Hammond
    testified that the unnecessary stents were defined as the Cin-
    derella fives, fours, and a few threes. Based on these figures,
    the district court found that "with the 579,000 clear stent-
    related loss and the hospital’s reimbursement . . . there cer-
    tainly is a loss in excess of a million dollars, and the 16-level
    enhancement should apply."10
    McLean argues that loss was not established by the prepon-
    derance of the evidence because Cinderella’s analysis was
    unreliable, the government failed to prove that any specific
    follow-up test was inappropriate, and the hospital’s losses
    were not caused by "relevant conduct." We are not persuaded.
    Neither the follow-up tests nor the hospital’s losses would
    have occurred but for the medically unnecessary stents
    McLean performed; as such, they were properly included as
    losses from relevant conduct. See U.S.S.G. § 1B1.3(a)(3)
    (permitting sentencing courts to consider "all harm that
    resulted from the acts and omissions" of the defendant).
    Moreover, the district court did not clearly err in relying on
    Cinderella’s analysis. McLean contends that Cinderella was
    biased and his opinions were not grounded in objective
    criteria. However, the district court had the opportunity to
    10
    McLean argues that the case should be remanded for resentencing
    because the district court did not specify the amount of loss. We disagree.
    Although the district court did not do the math in open court, the court
    clearly found that the total loss equaled the sum of $579,000 and the hos-
    pital’s $1.3 million settlement figure, as the above statements demonstrate.
    UNITED STATES v. MCLEAN                           25
    evaluate Cinderella’s credibility and the strength of his opin-
    ions at trial, and we cannot say it was unreasonable to credit
    his testimony. In sum, we find no clear error in the district
    court’s loss calculations.11
    VI.
    For the reasons explained above, the convictions and sen-
    tence are affirmed.
    AFFIRMED
    11
    McLean also argues that the hospital’s repayments for Cinderella
    threes should have been excluded because the government never
    attempted to prove that these cases were fraudulent. We disagree.
    Although Cinderella classified these cases as "judgment call[s]," the judg-
    ment that they were inappropriate was made when the hospital agreed to
    repayment. Based on that judgment, it was not clear error to find that the
    procedures were more likely than not part of McLean’s fraudulent scheme.