Peabody Coal Co. v. Director, Office of Workers' Compensation Programs , 746 F.3d 1119 ( 2014 )


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  •                      FOR PUBLICATION
    UNITED STATES COURT OF APPEALS
    FOR THE NINTH CIRCUIT
    PEABODY COAL COMPANY,                             No. 12-70535
    Petitioner,
    BRB No.
    v.                              10-0463
    DIRECTOR, OFFICE OF WORKERS’
    COMPENSATION PROGRAMS; U.S.                         OPINION
    DEPARTMENT OF LABOR; ROBERT
    DALE OPP, Deceased,
    Respondents.
    On Petition for Review of an Order of the
    Benefits Review Board
    Submitted July 11, 2013*
    Portland, Oregon
    Filed April 1, 2014
    Before: Harry Pregerson, Mary H. Murguia,
    and Morgan Christen, Circuit Judges.
    Opinion by Judge Pregerson
    *
    The panel unanimously concludes this case is suitable for decision
    without oral argument. See Fed. R. App. P. 34(a)(2).
    2                   PEABODY COAL V. OWCP
    SUMMARY**
    Black Lung Benefits Act
    The panel denied a petition for review of a decision of the
    Benefits Review Board ordering Peabody Coal Company to
    pay a coal miner’s surviving spouse benefits under the Black
    Lung Benefits Act of 1972.
    The panel held that the administrative law judge did not
    violate the Administrative Procedure Act by considering the
    regulatory preamble to the Black Lung Benefits Act in his
    decision awarding benefits. The panel held that a preamble
    may be used to give an ALJ understanding of a scientific or
    medical issue, and concluded that the ALJ properly
    considered the regulatory preamble to evaluate conflicting
    expert medical opinions. The panel also held that the ALJ’s
    award of benefits was supported by substantial evidence.
    COUNSEL
    Mark E. Solomons and Laura Metcoff Klaus, Greenberg
    Traurig, LLP, Washington, D.C., for Petitioner.
    Jeffrey S. Goldberg, United States Department of Labor,
    Washington, D.C., for Respondent.
    Martin J. Linnet and Jonathan Wilderman, Wilderman and
    Linnet, P.C., Golden, Colorado, for Respondent.
    **
    This summary constitutes no part of the opinion of the court. It has
    been prepared by court staff for the convenience of the reader.
    PEABODY COAL V. OWCP                              3
    OPINION
    PREGERSON, Circuit Judge:
    In 2000, Robert Opp (“Opp”) filed a disability benefits
    claim against Peabody Coal Company (“Peabody”) under the
    Black Lung Benefits Act of 1972. 
    30 U.S.C. § 901
    (a). Opp,
    a coal miner for nearly forty years, smoked for over fifty
    years. In the mid-1990s, Opp began suffering from chronic
    obstructive pulmonary disease (“COPD”). Opp alleged that
    his COPD arose out of his employment as a coal miner.
    When a claimant proves total disability due to either clinical
    pneumoconiosis or legal pneumoconiosis, the claimant is
    eligible for benefits under the Black Lung Benefits Act. See
    
    20 C.F.R. § 718.201
    (a). Opp alleged that his condition
    constituted legal pneumoconiosis and that he was entitled to
    benefits under the Act.1
    Following a number of administrative hearings and
    reviews by the Benefits Review Board, an administrative law
    judge (“ALJ”) ordered Peabody to pay Opp’s surviving
    spouse all the benefits to which Opp was entitled to receive
    between January 1, 2000, and August 31, 2002. The Benefits
    Review Board affirmed the ALJ’s decision and Peabody Coal
    petitions for review of that decision. We have jurisdiction to
    review Peabody’s petition pursuant to 
    33 U.S.C. § 921
    (c),
    and we deny the petition.
    1
    Following Opp’s death in 2002, his widow has pursued his claim.
    4                    PEABODY COAL V. OWCP
    I. BACKGROUND
    A. Factual History
    1. The Statute and Regulations
    The Black Lung Benefits Act awards benefits to coal
    miners suffering from pneumoconiosis, defined as “a chronic
    dust disease of the lung and its sequelae, including respiratory
    and pulmonary impairments, arising out of coal mine
    employment.” 
    30 U.S.C. § 902
    (b). A disease arises out of
    coal mine employment if it is “significantly related to, or
    substantially aggravated by, dust exposure in coal mine
    employment.” 
    20 C.F.R. § 718.201
    (b).
    Before 2001, the Black Lung Benefits Act regulations
    provided that coal miners suffering from clinical
    pneumoconiosis were eligible for benefits under the Act.
    
    20 C.F.R. § 718.201
    (a) (2000). Clinical pneumoconiosis
    refers to a cluster of typically chronic restrictive pulmonary
    diseases recognized by the medical community as fibrotic
    reactions to “permanent deposition of substantial amounts of
    particulate matter in the lungs.” 
    20 C.F.R. § 718.201
    (a)(1).
    In 2001, the regulations were amended to clarify that coal
    miners suffering from legal pneumoconiosis may also receive
    benefits under the Act. Legal pneumoconiosis refers to “any
    chronic lung disease or impairment,” including “chronic
    restrictive or obstructive pulmonary disease arising out of
    coal mine employment.”2 
    20 C.F.R. § 718.201
    (a)(2)
    2
    Restrictive lung disease, or interstitial lung disease, makes it difficult
    to fill the lungs with air, and for the body to get enough oxygen. National
    Institutes of Health, Interstitial Lung Diseases, MedlinePlus,
    http://www.nlm.nih.gov/medlineplus/interstitiallungdiseases.html (last
    PEABODY COAL V. OWCP                              5
    (emphasis added). Before Opp’s death, he suffered from
    COPD, which he alleged was a form of legal
    pneumoconiosis.
    2. The Regulatory Preamble
    The preamble to the 2001 amendments that clarify the
    regulatory definition of pneumoconiosis explains that the
    amendments were intended to “conform [the regulatory
    definition] to the statute,” which defines pneumoconiosis
    broadly. 65 Fed. Reg. at 79937. “The Department [of Labor]
    . . . received both favorable and unfavorable comments on its
    proposed revision to the definition of pneumoconiosis.” Id.
    During the notice and comment period, several of the
    unfavorable comments referred to a review of the available
    medical literature on obstructive lung disease and pulmonary
    dysfunction in coal miners, written by Dr. Gregory Fino, a
    Board-certified physician in pulmonary diseases, and Dr.
    Barbara Bahl, a doctor in nursing and biostatistics. Id. at
    79938. Dr. Fino’s and Dr. Bahl’s “review of the literature . . .
    led them to conclude that virtually all of the articles they
    reviewed [were] flawed, and that there [was] no evidence of
    a clinically significant reduction in lung function resulting
    from coal mine dust exposure.” Id.
    updated July 22, 2013). Obstructive lung disease includes three disease
    processes that make it difficult to empty the lungs of air: (1) chronic
    bronchitis, (2) emphysema, and (3) asthma. Regulations Implementing the
    Federal Coal Mine Health and Safety Act of 1969, as Amended, 
    65 Fed. Reg. 79920
    , 79939 (Dec. 20, 2000); National Institutes of Health, What
    is COPD?, National Heart, Lung, and Blood Institute,
    http://www.nhlbi.nih.gov/health/health-topics/topics/copd/ (last updated
    July 31, 2013).
    6                PEABODY COAL V. OWCP
    In the preamble, the Department of Labor observed that
    Dr. Fino’s and Dr. Bahl’s “opinions [were] not in accord with
    the prevailing view of the medical community or the
    substantial weight of the medical and scientific literature.”
    
    Id. at 79939
    . The preamble addressed several studies in the
    medical record that “contain overwhelming scientific and
    medical evidence demonstrating that coal mine dust exposure
    can cause obstructive lung disease.” 
    Id. at 79944
    ; see 
    id.
     at
    79941–44.
    The preamble first evaluated the medical and scientific
    literature on chronic bronchitis. The Oxman study, for
    instance, “found a statistically significant association between
    cumulative dust exposure and decline in lung function.” 
    Id.
    at 79939 (citing A.D. Oxman et al., Occupational Dust
    Exposure and Chronic Obstructive Pulmonary Disease: A
    Systematic Overview of the Evidence, 148 Am. Rev.
    Respiratory Disease 38 (1993)). The Oxman study likely
    “underestimates the association between inhalation of coal
    mine dust and loss of lung function” because unhealthy
    workers tend to exit the workforce. 
    Id.
     (emphasis omitted).
    Likewise, the Marine study found that “[e]ven in the absence
    of smoking, coal mine dust exposure is clearly associated
    with clinically significant airways obstruction and chronic
    bronchitis.” 
    Id.
     at 77940 (citing W.M. Marine et al.,
    Clinically Important Respiratory Effects of Dust Exposure
    and Smoking in British Coal Miners, 137 Am. Rev.
    Respiratory Disease 106 (1988)). The Marine study found
    that “[t]he risk [of airways obstruction resulting from coal
    mine dust exposure] is additive with cigarette smoking.” 
    Id.
    Studies similar to the Marine study, such as the Attfield and
    Hodous study, “demonstrated a clear relationship between
    dust exposure and a decline in pulmonary function [in coal
    miners] of about 5 to 9 milliliters a year.” 
    Id.
     (citing M.D.
    PEABODY COAL V. OWCP                       7
    Attfield & T.K. Hodous, Pulmonary Function of U.S. Coal
    Miners Related to Dust Exposure Estimates, 145 Am. Rev.
    Respiratory Disease 605 (1992)). According to Attfield and
    Hodous, the “average decrement for smokers was only 5ml”
    per pack-year of smoking. 
    Id. at 79941
     (quoting 145 Am.
    Rev. Respiratory Disease at 608).
    The preamble next evaluated the medical and scientific
    literature on emphysema. The Cockcroft study found that
    centrilobular emphysema “was significantly more common
    among . . . coal workers” and “related to the amount of dust
    in the lungs.” 
    Id.
     (citing A. Cockcroft et al., Post-mortem
    Study of Emphysema in Coalworkers and Non-Coalworkers,
    2 Lancet 600 (1982)). The Leigh study found “strong
    evidence that emphysema in coalworkers is causally related
    to lung coal content.” 
    Id. at 79942
     (quoting J. Leigh et al.,
    Quantified Pathology of Emphysema, Pneumoconiosis and
    Chronic Bronchitis in Coal Workers, 40 Brit. J. Indus. Med.
    258 (1983)). The Ruckley study also found evidence of a
    causal connection between coal dust exposure and
    emphysema. 
    Id.
     (citing V.A. Ruckley et al., Emphysema and
    Dust Exposure in a Group of Coal Workers, 129 Am. Rev.
    Respiratory Disease 528 (1984)). Dr. Fino and Dr. Bahl cited
    several sources supporting the contention that there is no
    causal connection between coal dust exposure and
    emphysema. The preamble noted that Dr. Fino and Dr. Bahl
    quoted a passage from a textbook on occupational lung
    disease to support their assertion that focal emphysema
    cannot be equated with airways obstruction. 
    Id.
     (citing
    Occupational Lung Diseases (W. Keith C. Morgan &
    Anthony Seaton eds., (3d ed. 1995))). But the preamble also
    noted another passage from the same textbook that stated
    “[t]he increased risk of centriacinar emphysema . . . supports
    the hypothesis that coal dust exposure sufficient to cause
    8                PEABODY COAL V. OWCP
    alveolar inflammation and fibrosis also initiates centriacinar
    emphysema.” 
    Id.
     (quoting Occupational Lung Diseases at
    400–401).
    3. The Relevant Testimony
    At his administrative hearing in 2000, Opp testified about
    his smoking history and coal mine employment. Opp worked
    as a coal miner for thirty-nine years and smoked between
    one-half and one and a half packs of cigarettes a day for
    around fifty-two years. Opp testified that “a lot of times” he
    quit smoking for “six or seven months at a time.” He said
    that he “[m]ight have only smoked four months some of the[]
    years,” while other years he may have “smoked [for] eight”
    months.
    As a coal miner, Opp worked on the surface of the mine.
    He operated an end loader during the last fifteen years of his
    coal mine employment. Opp described his work environment
    as dusty to “real bad.” He said the dust saturated all the way
    through his clothing to his skin, and that within a half hour of
    starting work, his clean clothes would be dirty.
    In 1989, Opp was forced to retire after he broke his back
    during a fall from the radiator of a haul truck. Opp
    underwent surgery for this injury. He testified that his
    breathing problems were “just starting” when he injured his
    back.
    Two medical experts testified that Opp’s respiratory
    impairment was attributable to his employment as a coal
    miner. In 2000, the Department of Labor provided for an
    examination of Opp by physician David James. Opp testified
    that he told Dr. James that he “had been short of breath” since
    PEABODY COAL V. OWCP                        9
    1994 or 1995. Dr. James diagnosed Opp with: (1) coal
    workers’ legal pneumoconiosis, attributable to coal dust
    exposure; (2) COPD, attributable to coal dust exposure and
    smoking; and, (3) exercise-induced desaturation of oxygen,
    attributable to pneumoconiosis and COPD. Dr. James
    concluded that “chronic exposure to coal mine dust [was] a
    contributing factor to [Opp’s] total disability and severe
    respiratory impairment.”
    In 2001, Opp’s treating physician, William Anderson,
    prepared a report on Opp’s respiratory condition. Dr.
    Anderson expressed the opinion that Opp was suffering from
    COPD and concluded that coal dust exposure “most probably
    [was] a contributing factor . . . due to [Opp’s] severe disease
    at [the] relatively young age [of 68].”
    Peabody’s four medical experts, who assessed Opp’s
    respiratory impairment between 2000 and 2001, testified that
    Opp’s respiratory impairment was not attributable to his coal
    mine employment. In 2000, Dr. Lawrence Repsher examined
    Opp and diagnosed him with COPD unrelated to coal dust
    exposure. Dr. Repsher concluded that Opp did not have coal
    workers’ pneumoconiosis because he believed that coal dust
    has primarily restrictive, rather than obstructive effects. At
    his deposition, Dr. Repsher testified that “the coal mine dust
    literature”does not provide evidence that coal dust exposure
    can cause “clinically significant [COPD]” in a miner who
    never smoked.
    In 2001, Dr. Peter Tuteur prepared a report based on
    Opp’s medical record. Dr. Tuteur described Opp’s symptoms
    as “quintessentially characteristic of . . . [COPD].” Dr.
    Tuteur testified that “[t]here’s no credible evidence in the
    literature to indicate that coal mine dust inhalation acts
    10               PEABODY COAL V. OWCP
    additively or synergistically with the chronic inhalation of
    tobacco smoke to promote [COPD].”
    Also in 2001, Dr. Joseph Renn prepared a report based on
    Opp’s medical record. Dr. Renn diagnosed Opp with
    “chronic bronchitis with an asthmatic component and
    pulmonary emphysema,” all stemming from tobacco smoking
    rather than exposure to coal mine dust.
    Finally, Dr. Fino, in 2001, prepared a report based on
    Opp’s medical record. Dr. Fino diagnosed Opp with bullous
    emphysema, “a classic pattern that one would expect as a
    result of cigarette smoking.” At his deposition, however, Dr.
    Fino admitted the possibility of a coal-dust-induced disease
    “in a susceptible individual.”
    B. Procedural History
    During a lengthy procedural process, the ALJ twice
    awarded and twice denied benefits. The Benefits Review
    Board remanded the case to the ALJ three times. In its 2009
    remand to the ALJ, the Benefits Review Board explicitly
    permitted the ALJ to review the medical literature in the
    record to determine whether Dr. James, who believed that
    Opp’s COPD was caused in part by coal dust, “accurately
    characterized the literature.” The Benefits Review Board also
    permitted the ALJ to consider “whether the criticisms that
    [Peabody’s] experts have raised concerning the studies [that
    Dr. James relied on] have merit.” The ALJ properly
    construed this to mean that he should assess whether
    Peabody’s experts accurately characterized and critiqued the
    literature.
    PEABODY COAL V. OWCP                      11
    In evaluating the merit and accuracy of the medical expert
    testimony, the ALJ relied, in part, on the regulatory preamble
    to 
    20 C.F.R. § 718.201
    (a), the regulation defining coal
    workers’ pneumoconiosis. See 65 Fed. Reg. at 79937–45.
    The ALJ concluded that Dr. James’s and Dr. Anderson’s
    opinions that coal dust exposure contributed to Opp’s COPD
    were well reasoned and documented. The ALJ also
    concluded that Dr. James accurately characterized the
    medical literature. In contrast, the ALJ found that Peabody’s
    doctors’ opinions should be discounted and accorded
    diminished evidentiary weight because their negative
    characterization of the medical literature was not in accord
    with prevailing medical views, as set forth in the regulatory
    preamble. The ALJ also found “substantial equivalency”
    between coal dust conditions in Opp’s work on the surface of
    the mine and “underground coal mine work.”
    The ALJ concluded that Opp’s legal pneumoconiosis
    arose out of coal mine employment, and that Opp’s coal mine
    employment was “a substantial contributing cause of [Opp’s]
    totally disabling . . . pulmonary impairment.” The ALJ
    ordered Peabody to pay Opp’s surviving spouse all the
    benefits to which Opp was entitled between January 1, 2000,
    and August 31, 2002. The Benefits Review Board affirmed
    the ALJ’s decision in 2011. Peabody appeals.
    II. ANALYSIS
    A. The ALJ Did Not Violate the Administrative
    Procedure Act by Considering the Preamble.
    Peabody challenges the ALJ’s reliance on the regulatory
    preamble in his decision awarding benefits to Opp. Peabody
    argues that the ALJ impermissibly gave the regulatory
    12               PEABODY COAL V. OWCP
    preamble the force of law in violation of the Administrative
    Procedure Act. This challenge therefore presents a question
    of law that we review de novo. Valladolid v. Pac. Operations
    Offshore, LLP, 
    604 F.3d 1126
    , 1130 (9th Cir. 2010).
    The Black Lung Benefits Act requires that regulations be
    issued in conformity with 
    5 U.S.C. § 553
     of the
    Administrative Procedure Act. 
    30 U.S.C. § 936
    (a). Pursuant
    to § 553, regulations may be promulgated following a period
    of notice and comment. A regulatory preamble, such as the
    one at issue in this case, is not subject to notice and comment.
    As a result, the preamble is not legally binding. See § 936(a).
    In 2002, mine operators, insurance companies, and the
    National Mining Association (collectively, the “NMA”)
    challenged the legality of the preamble at issue in this case.
    Nat’l Mining Ass’n v. Dep’t of Labor, 
    292 F.3d 849
    , 855
    (D.C. Cir. 2002). The NMA was concerned that coal mine
    workers with lung impairments who also smoked would be
    presumed eligible for benefits and the preamble would
    impermissibly be given the force of law. The United Mine
    Workers of America and other black lung advocates
    intervened on behalf of the Secretary of Labor, arguing in
    favor of the regulations and the preamble. 
    Id.
     The D.C.
    Circuit upheld the regulations in all respects, confirming that
    the preamble does not diminish the requirement that miners
    individually demonstrate their lung impairments arose out of
    coal mining employment: “[T]he preamble itself states that
    the revised definition [of pneumoconiosis] does not alter the
    requirement that individual miners must demonstrate that
    their obstructive lung disease arose out of their work in the
    mines.” 
    Id.
     at 863 (citing 65 Fed. Reg. at 79938).
    PEABODY COAL V. OWCP                            13
    Here, Peabody argues that (1) Opp has not demonstrated
    that his COPD arose from coal mine employment, and (2) the
    ALJ impermissibly relied on the preamble to award benefits.
    We find, however, that the ALJ simply—and not
    improperly—considered the regulatory preamble to evaluate
    conflicting expert medical opinions. The ALJ then evaluated
    the record to determine that Opp’s condition did, in fact, arise
    from coal mine employment.
    A preamble may be used to give an ALJ understanding of
    a scientific or medical issue. The ALJ’s reliance on the
    regulatory preamble has been explicitly endorsed by various
    courts of appeal and the Benefits Review Board. See A & E
    Coal Co. v. Adams, 
    694 F.3d 798
    , 802 (6th Cir. 2012)
    (explaining that the preamble “merely explains why the
    regulations were amended” and did “not expand their
    reach”);3 Harman Mining Co. v. Dir., Office of Workers’
    Comp. Programs, 
    678 F.3d 305
    , 314–15 (4th Cir. 2012)
    (concluding that “the ALJ was entitled to” look to the
    preamble to assess a medical expert’s credibility); Helen
    Mining Co. v. Dir., Office of Workers’ Comp. Programs,
    
    650 F.3d 248
    , 257 (3d Cir. 2011) (stating “[t]he ALJ’s
    reference to the preamble . . . unquestionably supports the
    reasonableness of his decision to assign less weight” to a
    medical expert’s opinion); Consolidation Coal Co. v. Dir.,
    Office of Workers’ Comp. Programs, 
    521 F.3d 723
    , 726 (7th
    Cir. 2008) (describing as “sensible” an ALJ’s decision to
    discredit a medical expert’s opinion that was inconsistent
    with the preamble); Ethel Groves v. Island Creek Coal Co.,
    BRB No. 10-0592, 
    2011 WL 2781446
    , at *3 (DOL Ben. Rev.
    Bd. June 23, 2011) (ruling that “an administrative law judge
    3
    In A & E Coal Co., the petitioner presented—and the Sixth Circuit
    rejected—the same argument Peabody presents here.
    14               PEABODY COAL V. OWCP
    has the discretion to examine whether a physician’s reasoning
    is consistent with the conclusions contained in medical
    literature and scientific studies relied upon by [the
    Department of Labor] in drafting the definition of legal
    pneumoconiosis”).
    Peabody relies on Wyeth v. Levine, 
    555 U.S. 555
     (2009)
    and Home Concrete & Supply, LLC v. United States, 
    634 F.3d 249
     (4th Cir. 2011) to argue that we should be wary of
    preambles that rewrite or significantly supplement regulations
    and statutes. In the case before us, however, the preamble
    does no such thing. It is consistent with the Black Lung
    Benefits Act and its regulations. Thus, Wyeth and Home
    Concrete & Supply are inapposite.
    In Wyeth, the drug company Wyeth failed to warn about
    the consequences of administering a drug through the IV push
    method. 
    555 U.S. 555
    , 559–60 (2009). Wyeth argued that
    Levine’s state law claims were preempted as an obstacle to
    federal regulation because: (1) the drug’s label complied with
    the Federal Drug Administration (“FDA”) regulations, and
    (2) the 2006 preamble to an FDA regulation declared that
    state law failure-to-warn claims “threaten the FDA’s
    statutorily prescribed role as the expert Federal agency
    responsible for evaluating and regulating drugs.” 
    Id.
     at
    575–76 (internal quotation marks and citation omitted). The
    contested preamble in Wyeth contained an agency’s legal
    interpretation, and not, as in the case before us, a fact-based
    explanation of the agency’s interpretation in light of
    empirical research. In Wyeth, “[w]hen the FDA issued its
    notice of proposed rulemaking in December 2000, it
    explained that the rule would not contain policies that have
    federalism implications or that preempt State law.” 
    Id. at 577
    (internal quotation marks and citation omitted). Thus, the
    PEABODY COAL V. OWCP                       15
    preamble at issue in Wyeth provided a legal interpretation that
    “reverse[d] the FDA’s own longstanding position without
    providing a reasoned explanation,” and this is why the Court
    ruled that the preamble “[did] not merit deference.” 
    Id.
    Peabody’s reliance on Home Concrete & Supply is
    similarly misplaced. Home Concrete & Supply discusses the
    period of time in which the Internal Revenue Service (“IRS”)
    may make certain kinds of tax assessments under 
    26 U.S.C. § 6501
    . 
    634 F.3d 249
     (4th Cir. 2011). In Home Concrete &
    Supply, the IRS argued that, pursuant to the preamble of
    Treasury Decision 9511, the “six-year period for assessing
    tax” remained open for “all taxable years . . . that are the
    subject of any case pending before any court of competent
    jurisdiction . . . in which a decision had not become final.”
    
    Id. at 256
     (internal quotation marks and citation omitted). In
    § 6501(a), however, Congress provided that the window for
    tax assessments closed after three years, barring special
    circumstances. Thus, the Fourth Circuit denied force to the
    preamble at issue in Home Concrete & Supply because it
    contradicted plain statutory language. 
    634 F.3d at
    256–57.
    In short, unlike the preambles in Wyeth and Home
    Concrete & Supply, the preamble in the case before us is
    “entirely consistent with the [Black Lung Benefits] Act and
    its regulations.” Harman Mining Co., 
    678 F.3d at
    315 n.4.
    Like the preamble we addressed in El Comite Para el
    Bienestar de Earlimart v. Warmerdam, the preamble in this
    case “aid[s] in achieving a general understanding of the
    statute,” 
    539 F.3d 1062
    , 1070 (9th Cir. 2008) (internal
    quotation marks and citation omitted), because it “simply
    explains the scientific and medical basis for the regulations”
    that extended the definition of pneumoconiosis, Harman
    Mining Co., 
    678 F.3d at
    315 n.4. The preamble discusses the
    16               PEABODY COAL V. OWCP
    medical and scientific literature included in the record at the
    time the Department of Labor amended the regulation
    defining pneumoconiosis. The evidence supports the
    conclusion that coal dust exposure contributes to chronic
    obstructive disease.
    Thus, we join our sister circuits in holding that an ALJ
    may consider the regulatory preamble.
    B. The ALJ’s Award of Benefits to Opp is Supported by
    Substantial Evidence.
    Absent error of law, the ALJ’s findings and conclusions
    must be affirmed if supported by substantial evidence.
    Palmer Coking Coal Co. v. Dir., Office of Workers’ Comp.
    Programs, 
    720 F.2d 1054
    , 1056 (9th Cir. 1983). Substantial
    evidence is such evidence that a reasonable mind might
    accept as adequate to support a conclusion. Conahan v.
    Sebelius, 
    659 F.3d 1246
    , 1249 (9th Cir. 2011). “The
    substantial evidence test for upholding factual findings is
    ‘extremely deferential to the factfinder.’”        Rhine v.
    Stevedoring Servs. of Am., 
    596 F.3d 1161
    , 1165 (9th Cir.
    2010) (quoting Metro. Stevedore Co. v. Rambo, 
    521 U.S. 121
    ,
    149 (1997)). In weighing medical evidence, “the ALJ is free
    to credit a witness’s testimony in the face of one party’s
    argument that the witness is not credible.” Haw. Stevedores,
    Inc. v. Ogawa, 
    608 F.3d 642
    , 650 (9th Cir. 2010).
    After assessing the expert medical testimony, the ALJ
    found that Opp’s COPD arose out of his coal mine
    employment. The ALJ rationally credited Dr. James’s
    opinion as well supported and reasoned. Dr. James relied on
    a number of factors to conclude that Opp’s COPD was caused
    by smoking and coal dust exposure, including: (1) Opp’s
    PEABODY COAL V. OWCP                        17
    medical, smoking, and employment histories; (2) medical
    literature showing that coal mine dust can cause airflow
    obstruction in miners whose x-rays do not show evidence of
    fibrotic disease; (3) the limited reversibility of Opp’s
    condition after use of a bronchodilator; and (4) the unusual
    severity of Opp’s impairment.
    The ALJ rationally discounted the testimony of Peabody’s
    medical experts, who based their opinions on the premise that
    coal dust exposure never, or very rarely, causes COPD. The
    ALJ permissibly looked to the preamble to determine that
    Peabody’s medical experts proffered only one of several
    interpretations of the evidence. The ALJ concluded that, in
    light of the preamble’s interpretation of the conflicting
    medical evidence included in the medical record, Peabody’s
    medical experts’ opinions were appropriately afforded less
    weight. To reverse the ALJ’s findings on substantial
    evidence review in a black lung disability case “we would
    have to find that [Peabody’s medical experts’] interpretation
    [of the evidence] was the only permissible one.” Midland
    Coal Co. v. Dir., Office of Workers’ Comp. Programs,
    
    358 F.3d 486
    , 492 (7th Cir. 2004). Because “there is
    considerable basic scientific data linking coal mine dust to the
    development of obstructive airways disease,” the ALJ
    properly discounted the contrary view advanced by
    Peabody’s experts. 65 Fed. Reg. at 79943.
    Accordingly, the ALJ’s decision to credit Dr. James’s and
    Dr. Anderson’s testimony and to afford diminished weight to
    Peabody’s medical experts’ testimony is supported by
    substantial evidence.
    18              PEABODY COAL V. OWCP
    CONCLUSION
    Because the agency’s award of benefits to Opp is
    supported by substantial evidence, we deny Peabody’s
    petition for review.
    Petition for review DENIED.