RAG American Coal Company v. OWCP ( 2009 )


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  •                           In the
    United States Court of Appeals
    For the Seventh Circuit
    No. 08-1653
    RAG A MERICAN C OAL C OMPANY,
    Petitioner,
    v.
    O FFICE OF W ORKERS’ C OMPENSATION P ROGRAMS,
    Respondent,
    and
    JIMMIE D. B UCHANAN,
    Intervening Respondent.
    Petition for Review of an Order of
    the Benefits Review Board.
    No. 06-BLA-0967
    A RGUED JANUARY 14, 2009— D ECIDED A UGUST 5, 2009
    Before C UDAHY, K ANNE, and T INDER, Circuit Judges.
    T INDER, Circuit Judge. Jimmie D. Buchanan worked in
    Indiana coal strip mines for 20 years, enduring the
    constant exposure to dust customary for that line of work.
    He now suffers from substantial pulmonary/respiratory
    2                                               No. 08-1653
    problems. He filed two claims for benefits under the
    Black Lung Benefits Act, 
    30 U.S.C. §§ 901-945
    . His first
    claim was denied. On his second claim, he was awarded
    benefits. RAG American Coal Company (RAG) petitions
    for review of the order of the Benefits Review Board
    (Board), affirming the award. RAG contends that res
    judicata bars his second claim. We affirm.
    I. Background
    In 1993, Jimmie D. Buchanan filed an application for
    black lung benefits. He claimed that he had lung disease
    caused by inhalation of coal dust. He had worked in
    coal mines for 20 years. He also smoked cigarettes for
    36 years, averaging about one pack per day until cutting
    back during his last year as a miner, quitting entirely
    in 1994. In defending the claim, the employer contested
    that Buchanan had pneumoconiosis, that he was totally
    disabled, and that his disability was due to pneumoconio-
    sis.1
    On July 27, 1996, Administrative Law Judge (ALJ) J.
    Michael O’Neill issued his decision and order, denying
    benefits. He concluded that the record established that
    Buchanan stopped working because of his back condition
    1
    AMAX Coal Company originally was identified as the
    employer. As in most industries, coal mining has undergone
    a series of mergers and acquisitions in recent years and the
    employer is now identified as RAG American Coal Company.
    We will refer to the employer as RAG in this opinion.
    No. 08-1653                                                 3
    and he was totally disabled due to his back injury. He also
    found that Buchanan had a pulmonary impairment
    which precluded him from working. The ALJ determined
    that Buchanan did not have pneumoconiosis, however. In
    so doing, he gave greater weight to the opinions of
    Drs. Peter Tuteur and Frank Taylor that Buchanan’s
    emphysema and bronchitis were caused by cigarette
    smoking than to the opinions of Drs. Dan Combs and
    William Houser that exposure to coal mine dust was a
    significant factor in Buchanan’s lung impairment. ALJ
    O’Neill found that “[e]xposure to coal mine dust was
    neither a sufficient nor necessary cause of [Buchanan’s]
    pulmonary disability” and that “pneumoconiosis is not a
    necessary cause of his disability.” He concluded: “[E]ven
    if the claimant had never worked in surface coal mines . . . ,
    he would be disabled today because of cigarette-smoke-
    induced emphysema and bronchitis, together with
    chronic back pain and somewhat limited range of mo-
    tion.” The ALJ thus determined that Buchanan failed to
    establish that he was totally disabled due to pneumoconio-
    sis. On July 18, 1997, the Board affirmed the ALJ’s deci-
    sion. Buchanan took no further action on his first claim.
    In August 1998, Buchanan filed a second claim for
    benefits. In defending the claim, RAG argued that Bu-
    chanan was not totally disabled by pneumoconiosis. On
    May 20, 2002, ALJ Rudolf L. Jansen issued his decision
    and order, awarding benefits. He considered the evidence
    developed after the Board’s decision on Buchanan’s first
    claim to determine whether Buchanan had shown that
    his condition had substantially worsened so as to entitle
    him to benefits. This included ten additional x-rays with
    4                                              No. 08-1653
    numerous interpretations, two of which were positive
    for pneumoconiosis; five additional pulmonary function
    studies; and four additional arterial blood gas studies. It
    also included a report of an examination of Buchanan
    by internist Dr. Reynoldo Carandang from December 2,
    1998; a consulting report and supplement by Dr. Robert
    Cohen, dated April 28, 1999, and November 6, 2000,
    respectively; a June 17, 1999 examination and opinion by
    Dr. Jeff W. Selby; progress notes from Dr. Stephen Shoe-
    maker, Buchanan’s family physician; hospital records
    from 2000; several progress reports dated from 1999 to
    October 2000, from Dr. Houser, Buchanan’s treating
    pulmonologist; and consulting reports completed by Drs.
    Gregory Fino and Tuteur, board-certified pulmonologists,
    Dr. Joseph Renn, a pulmonary specialist, and Dr. David
    Hinkamp, board-certified in preventative medicine and
    occupational disease. Both Drs. Carandang and Houser
    opined that Buchanan suffered from a pulmonary
    disease that had arisen, in part, from his past coal dust
    exposure. In contrast, Drs. Selby, Fino, Tuteur, and Renn
    concluded that Buchanan’s disabling pulmonary impair-
    ment was unrelated to his coal mine employment.
    Giving greater weight to the opinions of Drs. Houser,
    Carandang, and Cohen and less weight to the opinions of
    Drs. Renn, Tuteur and Fino, ALJ Jansen found that Bu-
    chanan had established the existence of pneumoconiosis,
    thus showing a material change in his condition. The ALJ
    assigned the greatest weight to Dr. Houser’s opinion
    based on his specialty in pulmonology, his familiarity
    with Buchanan’s pulmonary condition due to his treat-
    ment of Buchanan since 1992, and the recency of his
    No. 08-1653                                             5
    examination and report. In addition, he explained that
    Dr. Houser’s reports and Dr. Cohen’s opinions were well-
    documented and well-reasoned. The ALJ weighed
    Dr. Carandang’s opinion favorably, in part, because he
    had examined Buchanan since the denial of his earlier
    claim, and the ALJ found the opinions of Drs. Cohen,
    Shoemaker, and Hinkamp supportive of Dr. Houser’s
    diagnosis and conclusions.
    The reports and opinions of Drs. Fino, Tuteur, and Renn
    were assigned less weight for two reasons. First, they
    relied on medical studies and literature which indicated
    that pneumoconiosis seldom arose in an obstructive
    disease and that in miners who were long-term smokers,
    any obstructive disease resulted from only tobacco
    smoke, not coal dust exposure. The ALJ found that this
    view had been rejected by this court as contrary to the
    prevailing view of the medical community and sub-
    stantial weight of the medical and scientific literature,
    citing Freeman United Coal Mining Co. v. Summers, 
    272 F.3d 473
    , 483 n.7 (7th Cir. 2001). The second reason for
    giving these consultants’ opinions less weight was that
    they were less familiar with Buchanan’s pulmonary
    condition than Dr. Houser.
    ALJ Jansen determined, based on Dr. Shoemaker’s
    reports and opinions and Dr. Houser’s and Dr. Cohen’s
    opinions, that Buchanan’s pulmonary condition had
    progressively and substantially worsened over the last
    four or five years. The ALJ relied, in part, on Dr. Shoe-
    maker’s notations of Buchanan’s frequent, recent hospital-
    izations, which showed he had several “acute” exacerba-
    6                                              No. 08-1653
    tions of his chronic pulmonary disease. ALJ Jansen
    found that Buchanan had established total disability due
    to pneumoconiosis and thus awarded him benefits com-
    mencing August 1, 1998.
    RAG petitioned the Board for review, and the Board
    affirmed in part, vacated in part, and remanded. On
    July 22, 2004, ALJ Jansen again issued an order awarding
    benefits. RAG sought reconsideration. On reconsidera-
    tion, ALJ Jansen reiterated that ALJ O’Neill had deter-
    mined that the evidence failed to establish pneumoconiosis
    and that Buchanan had demonstrated a material change
    in condition by showing that he had pneumoconiosis. ALJ
    Jansen also found a material change in Buchanan’s proof
    of total disability, indicating that Buchanan’s respiratory
    impairment had worsened in recent years. RAG appealed.
    The Board affirmed in part, reversed in part, and re-
    manded so the ALJ could reassess the medical opinions
    of Drs. Fino and Tuteur.
    On August 25, 2006, ALJ Jansen issued his decision and
    order on remand, again awarding benefits. The ALJ
    weighed the medical opinions, assigning less weight to
    the opinions of Drs. Fino and Tuteur because he found
    them not well-reasoned and in tension with the Depart-
    ment of Labors’s (DOL) findings regarding coal dust
    exposure and obstructive lung disease. ALJ Jansen
    found that Buchanan had pneumoconiosis and had estab-
    lished a material change in conditions. The ALJ also
    found that Buchanan demonstrated that he was totally
    disabled due to pneumoconiosis arising out of coal mine
    employment. RAG appealed to the Board, which affirmed.
    No. 08-1653                                                   7
    RAG moved for reconsideration; the motion was denied
    on January 18, 2008, and RAG petitioned this court for
    review.
    II. Discussion
    In challenging the award of benefits, RAG makes three
    arguments. RAG first contends that Buchanan’s second
    claim is barred by res judicata. RAG next challenges ALJ
    Jansen’s finding that Buchanan established a “material
    change in conditions.” And, third, RAG suggests that the
    refusal to apply ordinary principles of finality denied it
    due process of law. We review questions of law de novo.
    Midland Coal Co. v. Dir., Office of Workers’ Comp. Programs,
    
    358 F.3d 486
    , 489 (7th Cir. 2004). We review the ALJ’s
    decision to determine if it is rational, supported by sub-
    stantial evidence, and consistent with controlling law.
    Consolidation Coal Co. v. Dir., Office of Workers’ Comp.
    Programs, 
    521 F.3d 723
    , 725 (7th Cir. 2008). In doing so,
    we accept the ALJ’s factual findings if supported by
    substantial evidence in the record as a whole. 
    Id.
    Buchanan may avoid the res judicata effect of the denial
    of his earlier claim, if he establishes “that there has been a
    material change in conditions.” 
    20 C.F.R. § 725.309
    (c)
    (1999);2 see also Peabody Coal Co. v. Spese, 
    117 F.3d 1001
    , 1007
    (7th Cir. 1997) (en banc) (“By requiring denial of a second
    2
    Though § 725.309 has been revised, we refer to the version in
    effect when Buchanan filed his second claim for benefits and
    which applies to his claim.
    8                                                No. 08-1653
    application unless there has been a material change in
    conditions, the regulation gives res judicata effect to the
    first decision.”); Midland Coal, 
    358 F.3d at 489-90
     (stating
    that “traditional principles of res judicata do not bar a
    subsequent application for black lung benefits where a
    miner demonstrates a material change in at least one of
    the conditions of entitlement”). To show a material
    change, the claimant cannot merely present new evidence
    regarding his condition at the time of the earlier denial.
    
    Id. at 491
    ; Spese, 
    117 F.3d at 1008
    . Rather, he “must
    show that something capable of making a difference has
    changed since the record closed on the first application.”
    Spese, 
    117 F.3d at 1008
    . Thus, “[i]f the earlier denial
    listed both a failure to show pneumoconiosis and a
    failure to show total disability, the claimant can avoid
    automatic denial of his claim on res judicata grounds
    by showing a material change in either of those elements.”
    
    Id. at 1009
    . Accordingly, traditional principles of res
    judicata do not bar Buchanan’s second claim, as long as
    he has demonstrated a material change in his condition.
    That brings us to the next issue: whether Buchanan
    established a material change in his condition. ALJ Jansen
    found that he did. RAG challenges that finding. A claimant
    can establish a material change by establishing either
    (1) that he “did not have black lung disease at the time
    of the first application but has since contracted it and
    become totally disabled by it” or (2) that “his disease has
    progressed to the point of becoming totally disabling
    although it was not at the time of the first application.” 
    Id. at 1107
     (quoting Sahara Coal Co. v. Office of Workers’ Comp.
    Programs, 
    946 F.2d 554
    , 556 (7th Cir. 1991)); see also Midland
    No. 08-1653                                              9
    Coal, 
    358 F.3d at 493
    . The ALJ’s finding of a material
    change in condition is a factual determination that we
    review only for substantial evidence. See Midland Coal,
    
    358 F.3d at 493
    .
    ALJ Jansen’s finding that Buchanan showed a material
    change in his condition was supported by substantial
    evidence in the record. The ALJ found that Buchanan
    proved that he had pneumoconiosis. He also found that
    Buchanan’s pulmonary disease had progressively and
    substantially worsened since the denial of his first claim,
    such that he established total disability due to pneumoco-
    niosis.
    The finding of pneumoconiosis was based on the well-
    documented and well-reasoned medical opinions of
    Dr. Houser, Buchanan’s treating pulmonologist,
    Dr. Carandang, board certified in internal medicine, and
    Dr. Cohen, board certified pulmonary specialist. Both
    Drs. Carandang and Houser, who examined Buchanan
    since the denial of his first claim, opined that Buchanan
    suffered from a pulmonary disease, including pneumoconi-
    osis, that had arisen, in part, from his past coal dust
    exposure. Specifically, in November 2000, Dr. Houser
    reviewed Buchanan’s medical records going back to
    August 1998, including office visits, hospitalizations,
    pulmonary function tests, and arterial blood gas studies.
    Dr. Houser concluded that Buchanan had a disabling
    respiratory impairment which included coal workers’
    pneumoconiosis, category 1, chronic obstructive pulmo-
    nary disease (severe), chronic bronchitis, and emphysema.
    He also stated that Buchanan’s chest radiograph showed
    10                                                No. 08-1653
    category 1 pneumoconiosis and that his pneumoconiosis
    was related to his coal mine employment. Similarly,
    Dr. Carandang believed that Buchanan suffered from coal
    workers’ pneumoconiosis and severe obstructive lung
    disease caused by his tobacco use and coal mine employ-
    ment. He also believed that Buchanan would be unable
    to work in coal mine employment because of his im-
    paired lung function. And Dr. Cohen, board certified in
    pulmonology, gave a consulting opinion in which he
    opined that Buchanan suffered from coal workers’ pneu-
    moconiosis as well as severe chronic obstructive pulmo-
    nary disease which resulted from both his coal dust
    exposure and cigarette smoking. In Dr. Cohen’s judg-
    ment, Buchanan did not have the pulmonary capacity to
    perform his last coal mine job.
    Both Dr. Houser’s and Dr. Shoemaker’s records
    support a finding that Buchanan’s pulmonary disease
    progressively worsened since the denial of his first claim.
    In early 1999, Dr. Houser noted that Buchanan’s respira-
    tory condition was “fairly stable” and “essentially un-
    changed,” but in May 1999, he also noted Buchanan’s
    complaints of dyspnea 3 at night. Then, in January 2000,
    Dr. Houser noted that Buchanan was having “some
    exacerbation of respiratory symptoms,” with “increased
    cough and shortness of breath, plus some sputum produc-
    3
    Dyspnea is difficulty in breathing or shortness of
    breath. MedicineNet.com, Definition of Dyspnea, http://www.
    medterms.com/ script/main/art.asp?articlekey=3145 (last visited
    July 17, 2009).
    No. 08-1653                                          11
    tion.” On February 13, 2000, Dr. Shoemaker admitted
    Buchanan to the hospital for an “[a]cute exacerbation of
    chronic obstructive pulmonary disease” and bronchopneu-
    monia. Buchanan was experiencing shortness of breath
    with wheezing and some crackles throughout his lungs.
    His lungs were tight and he had poor air exchange. Bu-
    chanan was given steroids, oxygen, and aerosol treat-
    ments and was discharged one week later in an improved
    condition. In early May 2000, Dr. Houser indicated that
    Buchanan was having problems with increasing dyspnea,
    that pulmonary function tests and a spirometry showed
    “severe airway obstruction with no response to
    bronchodilator administration” and that Buchanan’s FEV1
    had decreased from 30% to 27% since November 1998.
    The doctor recommended pulmonary rehabilitation,
    including an inpatient program. On May 18, Dr. Shoe-
    maker admitted Buchanan to the hospital for shortness of
    breath and diagnosed him with pneumonia and acute
    exacerbation of chronic obstructive pulmonary disease.
    Buchanan was again treated with steroids and breathing
    treatments. On May 29, 2000, Buchanan was admitted to an
    inpatient pulmonary rehabilitation program. He was
    discharged on June 6, 2000, in an improved condition.
    Later that month, Dr. Houser observed that Buchanan
    seemed to be doing “fairly well” and in October 2000,
    noted that Buchanan said he was feeling better and had
    improved since the rehab program. Nonetheless, at that
    time, Buchanan’s chest exam showed diminished breath
    sounds, a prolonged expiratory phase, and his oxygen
    saturation on room air was only 90%.
    Dr. Houser’s and Dr. Cohen’s opinions further sup-
    port the conclusion that Buchanan’s pulmonary condi-
    12                                                No. 08-1653
    tion had worsened. Dr. Houser reviewed Buchanan’s
    pulmonary function tests from 1997, 1998, and 2000, all
    of which showed severe airway obstruction. He also
    reviewed arterial blood gas studies from June 17, 1999, and
    indicated that they showed “severe hypoxemia,” with a
    PO2 of 54 on exercise and oxygen saturation of 87.6%,
    below the 88% level which would qualify a person for
    home oxygen under Medicare guidelines. According to
    Dr. Houser, these values indicated that Buchanan needed
    supplemental oxygen on exercise. Dr. Cohen noted that
    1999 arterial blood gas tests showed a worsening of Bu-
    chanan’s lowered gas exchange with exercise and that
    those tests were stopped due to “extreme dyspnea.” He
    also indicated that Buchanan developed hypoxemia
    with exercise,4 which progressively worsened from Decem-
    ber 1998 to June 1999, when he described severe
    hypoxemia on exercise.
    We note as well that in comparing Buchanan’s pulmo-
    nary function test results from December 1998 to
    December 1993, Dr. Carandang noted a “marked decrease”
    in the DLCO—“the diffusing capacity of the lung
    for carbon monoxide.” MedlinePlus, Medical Encyclo-
    pedia, http://www.nlm.nih.gov/medlineplus/ency/article/
    4
    Hypoxemia is a low level of oxygen in the blood, the main
    symptom of which is shortness of breath. An arterial blood test
    measures blood oxygen. Normal values are between 95 and 100
    percent at sea level. Values under 90 are low; severe hypoxemia
    occurs when saturation is below 80 percent. MayoClinic.com,
    Hypoxemia, http://www.mayoclinic.com /health/
    hypoxemia/MY00219 (last visited July 17, 2009).
    No. 08-1653                                              13
    003854.htm (last visited July 17, 2009). He also observed a
    decline in Buchanan’s arterial blood gas test results from
    December 1993 to December 1998. And Dr. Hinkamp
    agreed that “[t]here is no doubt that [Buchanan’s] gas
    exchange abnormalities worsened over the years.” Dr.
    Renn likewise noted that the arterial blood gas studies
    showed a worsening of Buchanan’s condition from 1993
    to August 1997 and December 1998. He also indicated a
    decline in Buchanan’s condition demonstrated by pulmo-
    nary function studies, from 1982 (normal), 1990 (showing
    a “severe, significantly bronchoreversible obstructive
    ventilatory defect”), and 1997 and 1998 (showing a
    “very severe, significantly bronchoreversible obstructive
    ventilatory defect”). ALJ Jansen did not specifically rely
    on these opinions in finding that Buchanan’s
    pulmonary condition had progressively worsened. We
    mention them here only to show that the ALJ’s conclusion
    is supported by even more evidence than he actually cited.
    Furthermore, the record supports the finding that Bu-
    chanan’s back condition, though once totally disabling,
    had improved to the point at which it was no longer
    the source of his total disability. Subsequent to the denial
    of his first claim, Buchanan underwent two surgeries on
    his back, after which his back condition improved. After
    the second surgery, Dr. Houser indicated that most of
    Buchanan’s physical limitations, except those related to
    sitting, were due primarily to chronic obstructive pulmo-
    nary disease and that there was no indication that his
    treadmill exercise performance was affected by his back
    problem. The record contains not a single medical
    opinion that after the second surgery, Buchanan was
    totally disabled by his back condition.
    14                                                No. 08-1653
    Buchanan has demonstrated that “something capable of
    making a difference has changed since the record closed on
    the first application,” Spese, 
    117 F.3d at 1008
    . That some-
    thing is that he now has pneumoconiosis and his chronic
    pulmonary disease has progressively and substantially
    worsened to the point that he is now totally disabled
    by pneumoconiosis.
    None of RAG’s arguments lead us to a different con-
    clusion. RAG claims that Buchanan was totally disabled
    due to emphysema and bronchitis 5 when he litigated and
    lost his first claim for benefits. However, in the first claim,
    RAG maintained that Buchanan was totally disabled
    because of his lower back condition and wasn’t disabled on
    a pulmonary or respiratory basis. Buchanan and the
    Director argue that RAG should be judicially estopped
    from arguing that Buchanan was totally disabled by his
    respiratory impairment at the time of his first claim. We
    could hold that judicial estoppel bars any argument by
    RAG that Buchanan was totally disabled by emphysema
    and bronchitis at the time of his first claim. See Pakovich v.
    Broadspire Servs., Inc., 
    535 F.3d 601
    , 606 n.2 (7th Cir. 2008)
    (“[J]udicial estoppel provides that when a party prevails
    on one legal or factual ground in a lawsuit, that party
    cannot later repudiate that ground in subsequent litiga-
    tion based on the underlying facts.” (quotation omitted,
    emphasis in Pakovich)). RAG did argue in Buchanan’s
    5
    RAG uses COPD (chronic obstructive pulmonary disease),
    emphysema and bronchitis, and respiratory disease some-
    what interchangeably.
    No. 08-1653                                                 15
    first claim that he was not totally disabled due to his
    pulmonary/respiratory impairment—and ALJ O’Neill
    agreed, finding him totally disabled due to his back injury.
    But RAG’s res judicata argument really rests on its view
    that Buchanan should not be allowed to relitigate the cause
    of his pulmonary/respiratory impairment. See, e.g., Pet’r’s
    Br. at 15 (“This appeal seeks to restore principles of finality
    as a bar to a successive black lung claim where the
    dispositive issue raised in the litigation—the source of a
    claimant’s pulmonary or respiratory impairment—is not
    subject to change and has already been adjudicated . . . .”).
    Whether or not Buchanan was totally disabled due to a
    pulmonary/respiratory impairment at the time of his
    first claim is somewhat beside the point of RAG’s argu-
    ment here. Even if judicial estoppel were applied, Bu-
    chanan need not rely on this bar to prevail given the
    substantial evidence of a material change in his condi-
    tion, including that he had developed pneumoconiosis,
    which ALJ O’Neill found Buchanan had not established
    in deciding the first claim.
    As RAG asserts, ALJ O’Neill concluded that Buchanan’s
    emphysema and bronchitis were caused solely by
    cigarette smoking, not coal dust exposure. RAG argues
    that Buchanan was allowed to relitigate the cause of his
    emphysema and bronchitis. This leads right into RAG’s
    sideswipe at the conclusion (both the DOL’s and ours) that
    pneumoconiosis is progressive and latent. See Zeigler Coal
    Co. v. Office of Workers’ Comp. Programs, 
    490 F.3d 609
    , 618-19
    (7th Cir. 2007) (“We previously have held that both the
    latency and progressivity of coal workers’ pneumoconiosis
    16                                                No. 08-1653
    are legislative facts.”); Spese, 
    117 F.3d at 1010
     (stating that
    “the question whether simple pneumoconiosis can prog-
    ress in the absence of further exposure to coal dust is
    a question of legislative fact” and noting that the
    Benefits Review Board found “it has long been held that
    pneumoconiosis is a progressive and irreversible disease”
    (quotation omitted)). RAG gives us no good reason
    to revisit that view here.
    We note, however, that a report of the Surgeon General
    indicates that “simple” pneumoconiosis “does not progress
    in the absence of further exposure.” Surgeon General, U.S.
    Dep’t of Health & Human Servs., The Health Conse-
    quences of Smoking: Cancer and Chronic Lung Disease in
    the Workplace 294 (1985). For support, the report cites
    articles from 1961, 1955, and 1974. On the other hand, in
    support of its conclusion that pneumoconiosis is progres-
    sive, the DOL cites numerous authorities created after
    1985. See Regulations Implementing the Federal Coal Mine
    Health and Safety Act of 1969, as amended, 
    65 Fed. Reg. 79920
    , 79971 (Dec. 20, 2000); 
    64 Fed. Reg. 54966
    ,
    54978-79 (Oct. 8, 1999); 
    62 Fed. Reg. 3338
    , 3343-44 (Jan. 22,
    1997). Obviously, the Surgeon General could not have
    considered these more recent authorities back in 1985.
    Besides, none of the enumerated “summary and conclu-
    sions” in the Surgeon General’s report addresses whether
    pneumoconiosis is latent or progressive. RAG argues that
    the 1985 report is not outdated, directing us to a more
    recent report in which the Surgeon General updated the
    conclusions reached in prior reports. Ctrs for Disease
    Control & Prevention, U.S. Dep’t of Health & Human
    Servs., The Health Consequences of Smoking: A Report of
    No. 08-1653                                             17
    the Surgeon General (2004), http://www.cdc.gov/tobacco/
    data_statistics/sgr/2004/index.htm. None of the conclusions
    from the 1985 report summarized in the 2004 report
    concern the latency or progressivity of pneumoconiosis,
    however. See 
    id. at 465-66
    .
    The fact that pneumoconiosis may be progressive and
    latent justifies allowing a subsequent claim even
    without additional coal dust exposure since the denial of
    the earlier claim. Regulations Implementing the Federal
    Coal Mine Health and Safety Act of 1969, as amended, 
    62 Fed. Reg. 3338
    , 3343-44 (Jan. 22, 1997). Because pneumoco-
    niosis can be progressive and latent, ALJ Jansen’s deter-
    mination that Buchanan’s pneumoconiosis was caused in
    part by coal dust exposure did not necessarily revisit the
    earlier determination of the cause of Buchanan’s pulmo-
    nary impairment. Because ALJ O’Neill found that Bu-
    chanan did not have pneumoconiosis, he did not decide
    what caused the alleged pneumoconiosis. Thus, Bu-
    chanan’s second claim did not seek to relitigate the
    cause of his pneumoconiosis.
    RAG’s assertion that ALJ Jansen’s decision was not based
    on a change in Buchanan’s condition, but merely reflects
    disagreement with ALJ O’Neill’s decision concerning
    the source of Buchanan’s lung disease is not supported by
    the record. RAG identifies Drs. Houser, Cohen, Hinkamp,
    and Carandang as having opinions about Buchanan’s
    lung disease that did not change over time. It is not
    surprising that the doctors who believed that Buchanan’s
    lung disease was due to coal dust exposure in the first
    claim still believed that it was caused by coal dust expo-
    18                                               No. 08-1653
    sure in the second claim. But this does not require that
    ALJ Jansen reject their opinions. See Midland Coal, 
    358 F.3d at 493
     (stating that the physician’s opinion that
    claimant had some degree of pneumoconiosis all along
    was not necessarily dispositive where there was sub-
    stantial evidence to show a material change in the total
    disability element).
    In Spese, we clarified that a claimant need not negate
    every alternative ground on which an earlier denial was
    based. 
    117 F.3d at 1008
    . This, we said, was “consistent
    with general principles of issue preclusion, under which
    holdings in the alternative, either of which would inde-
    pendently be sufficient to support a result, are not con-
    clusive in subsequent litigation with respect to either
    issue standing alone.” Id.; see also Midland Coal, 
    358 F.3d at 493
    ; Regulations Implementing the Federal Coal Mine
    Health and Safety Act of 1969, as amended, 
    65 Fed. Reg. 79920
    , 79973 (Dec. 20, 2000) (“Where [a] finding was not
    essential to the original denial of benefits, because the
    ALJ ultimately denied benefits on another basis, or used
    alternative bases, issue preclusion would not prevent
    a second factfinder from making a different finding,
    based on his independent weighing of the evidence, in
    connection with an additional claim.”). ALJ O’Neill
    denied Buchanan’s earlier claim both because he found
    Buchanan had not shown pneumoconiosis and because he
    found that Buchanan was not totally disabled due to
    pneumoconiosis. Because ALJ O’Neill’s denial was based
    on these alternative holdings, neither is conclusive in
    Buchanan’s second claim with respect to the other
    standing alone. Thus, ALJ Jansen could, consistent with
    No. 08-1653                                                 19
    principles of issue preclusion, independently consider and
    weigh the opinions of Drs. Houser, Cohen, Hinkamp, and
    Carandang to determine such matters as the cause of
    Buchanan’s pulmonary condition, whether he has
    shown pneumoconiosis, and whether he is now totally
    disabled due to pneumoconiosis.
    And ALJ Jansen did consider and weigh the medical
    opinions. As we have said, “weighing conflicting medical
    evidence is precisely the function of the ALJ as fact-finder.”
    Consolidation Coal Co., 
    521 F.3d at 726
     (quotation omitted).
    ALJ Jansen gave greater weight to the opinions of Drs.
    Houser, Carandang, and Cohen and less weight to the
    opinions of Drs. Renn, Tuteur and Fino, and he gave
    good reasons for doing so. It is not up to us to reweigh
    the medical evidence. And ALJ Jansen had medical find-
    ings subsequent to the earlier denial to consider along
    with the prior medical history. We are asked to decide
    whether the ALJ’s decision is supported by substantial
    evidence in the record. Having considered the record,
    we conclude that ALJ Jansen’s determination that Bu-
    chanan has shown a material change in his condition is
    supported by substantial evidence.6
    Having decided that the ALJ’s decision regarding a
    material change in conditions is supported by substantial
    evidence, we move on to consider Buchanan’s entitlement
    6
    RAG’s claim that the refusal to apply ordinary principles of
    finality denies it due process of law is nothing more than a
    variation of its res judicata argument which we have already
    addressed.
    20                                               No. 08-1653
    to black lung benefits. In addition to demonstrating a
    material change in conditions, Buchanan must also estab-
    lish three elements to prove entitlement to benefits: that (1)
    he is totally disabled (2) by pneumoconiosis (3) arising at
    least in part out of coal mine employment. 
    Id. at 725
    . RAG
    has not challenged ALJ Jansen’s findings that Buchanan
    proved these elements. Therefore, it waived any challenge
    to these findings. Capitol Indem. Corp. v. Elston Self Serv.
    Wholesale Groceries, Inc., 
    559 F.3d 616
    , 619 (7th Cir. 2009)
    (failure to develop argument to dispute finding made
    below results in waiver of argument on appeal).
    Even if RAG had challenged these findings, its efforts
    would fail because these findings are supported by sub-
    stantial evidence in the record as a whole. The opinions of
    Drs. Houser, Carandang, Cohen, and Shoemaker sup-
    port ALJ Jansen’s finding that Buchanan is totally
    disabled by pneumoconiosis caused at least in part by
    coal mine employment. While there are other medical
    opinions that differ, ALJ Jansen gave a reasoned explana-
    tion for crediting the opinions that he did. We see no
    reason to disturb his weighing of the evidence.
    III.
    The decision awarding benefits is AFFIRMED.
    8-5-09