Mountain Clay, Inc. v. Spivey , 172 F. App'x 641 ( 2006 )


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  •                       NOT RECOMMENDED FOR PUBLICATION
    File Name: 06a0141n.06
    Filed: February 23, 2006
    No. 04-4297
    UNITED STATES COURT OF APPEALS
    FOR THE SIXTH CIRCUIT
    MOUNTAIN CLAY, INC.,
    Petitioner,
    v.                                             Petition for Review of Order
    of Benefits Review Board
    ROBERT L. SPIVEY; DIRECTOR, OFFICE OF
    WORKERS’ COMPENSATION PROGRAMS,
    UNITED STATES DEPARTMENT OF LABOR,
    Respondents.
    /
    Before:       GUY, SUTTON, and MCKEAGUE, Circuit Judges.
    RALPH B. GUY, JR., Circuit Judge.              Petitioner Mountain Clay, Inc., the
    responsible operator, seeks review of the final decision of the Benefits Review Board (BRB)
    affirming an award of black lung benefits to retired coal miner Robert L. Spivey under the
    Black Lung Benefits Act. 30 U.S.C. §§ 901-45; 20 C.F.R. §§ 718.201-204 (2005).
    Petitioner argues that the ALJ (1) failed to make necessary findings or properly analyze
    whether Spivey demonstrated a “material change of condition” required for a subsequent
    claim for benefits, and (2) failed to properly weigh the medical opinion evidence in finding
    on the merits that Spivey had proved entitlement to benefits. Both Spivey and the Director,
    Office of Workers’ Compensation Programs (Director), filed responses in support of the
    No. 04-4297                                                                                           2
    award. After a review of the record and the arguments presented on appeal, we affirm the
    BRB’s final decision and order awarding benefits to Spivey.
    I.
    Robert Spivey, born October 17, 1924, worked more than thirty years in coal mining
    and spent about 15 of those years working underground. There is no dispute that his last job
    driving trucks and equipment required some heavy work. He smoked cigarettes for five to
    seven years during his 20s, but then he stopped. In December 1989, at age 65, Spivey retired
    from coal mining. He made his first claim for black lung benefits in May 1991. Two
    medical opinions were obtained in connection with that claim. Drs. Dahhan and Broudy
    concluded, based on a negative x-ray and the results of pulmonary function and blood gas
    studies, that Spivey did not have pneumoconiosis and that, although he had mild respiratory
    impairment, he retained the ability to perform his previous coal mining work.1 The claim
    was denied in October 1991, and Spivey did not appeal.
    In April 1998, Spivey, then 73 years of age, made a second or “duplicate” application
    for black lung benefits. This is the claim before us now. The Department of Labor (DOL)
    concluded after administrative proceedings that Spivey was entitled to benefits. Mountain
    Clay requested a hearing before an administrative law judge (ALJ), which was conducted in
    July 1999. Benefits were awarded by the ALJ after the hearing and then twice more on
    successive remands for further findings and reweighing of the evidence following petitioner’s
    1
    Dr. Dahhan diagnosed hypertension, obesity, and a history of bronchitis of “unknown etiology,”
    while Dr. Broudy found hypertension, obesity, and “[c]hronic obstructive asthma with mild to moderate
    chronic obstructive airways disease.” At 5' 7 3/4", Spivey weighed about 215 lbs. when he made his first
    claim for benefits in 1991. Later examination records show he weighed about 230 lbs. in May and July
    1996; 215 lbs. in May and June 1998; and 200 lbs. in November 1998.
    No. 04-4297                                                                                               3
    appeals to the BRB.
    Without tracing all of the ALJ’s findings, we focus on those findings affirmed by the
    BRB initially, after remand, or in denying reconsideration, as well as the BRB’s conclusions
    concerning Mountain Clay’s challenges to those findings. The award ultimately rested on
    the ALJ’s determinations that Spivey established: (1) the existence of legal (but not clinical)
    pneumoconiosis; (2) which represented a “material change in conditions” since the denial of
    his first claim for benefits; (3) that the pneumoconiosis arose out of his coal mine
    employment; (4) that he had total respiratory disability from his prior coal mining work; and
    (5) that his disability was due at least in part to his pneumoconiosis.2
    The ALJ’s third decision awarding benefits, dated January 6, 2003, was affirmed by
    the BRB on February 26, 2004, and became final with the BRB’s denial of the petitioner’s
    motion for reconsideration on August 31, 2004. Mountain Clay filed the instant petition for
    review of the final BRB decision on October 26, 2004.3
    II.
    The evidence submitted in connection with Spivey’s second claim included seven
    medical opinions, 25 interpretations of six x-rays, and the results of various pulmonary
    function and blood gas studies. After considering the x-ray interpretations, only a few of
    which were “positive,” the ALJ concluded that the weight of the x-ray evidence was negative
    2
    “Pneumoconiosis” is 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).
    3
    Although the last two BRB decisions were divided opinions, Mountain Clay does not rely on the
    dissenting member’s view that it was not harmless error for the ALJ to have failed to consider evidence from
    the first claim in evaluating the second claim on the merits.
    No. 04-4297                                                                                              4
    and did not establish medical or “clinical” pneumoconiosis.4 This finding was affirmed by
    the BRB, and is not at issue on appeal. However, “pneumoconiosis” is defined to include
    not only “clinical pneumoconiosis,” which is a medical condition characterized by the
    fibrotic reaction of lung tissue to inhaled dust that may be detected by chest x-ray; but also
    the broader category of “legal pneumoconiosis,” which includes any chronic lung disease or
    impairment, including restrictive or obstructive impairments, arising out of coal mining
    employment. Eastover Mining Co. v. Williams, 
    338 F.3d 501
    , 509 (6th Cir. 2003); 20 C.F.R.
    § 718.201(a)(1) and (2). A disease “arising out of coal mine employment” is one that is
    significantly related to, or substantially aggravated by, coal dust exposure. C.F.R. §
    718.201(b).5
    The ALJ found that Spivey established the existence of legal pneumoconiosis through
    reasoned and supported medical opinion. 20 C.F.R. § 718.202(a)(4). After weighing the
    medical opinion evidence, the ALJ credited the opinions of Dr. Baker, who examined Spivey
    in May 1996 and May 1998, and Dr. Kiser, a family practitioner who was Spivey’s treating
    physician, and discounted, in whole or part, the opinions of Dr. Fino, who examined Spivey
    in November 1998, and Drs. Branscomb, Chandler, Broudy, and Younes, who rendered
    opinions based on a review of the medical records during the first part of 1999. Finally, in
    4
    Dr. Wheeler, a radiologist, reviewed several of Spivey’s x-rays; concluded that there was no
    evidence of clinical pneumoconiosis; and testified concerning the pattern of nodules typically found on x-
    rays of patients with clinical pneumoconiosis. He offered no opinions on the issue of legal pneumoconiosis.
    5
    Also, “[i]f a miner who is suffering or suffered from pneumoconiosis was employed for ten years
    or more in one or more coal mines, there shall be a rebuttable presumption that the pneumoconiosis arose
    out of such employment.” 20 C.F.R. § 718.203(b). The ALJ found and Mountain Clay does not dispute that
    this presumption applied.
    No. 04-4297                                                                                 5
    August 1999, Dr. Baker provided a written report detailing his findings, emphasizing that
    there were both positive and negative readings, and explaining why he did not agree with the
    contrary medical opinions.
    We begin with Dr. Baker, whose opinion was given the greatest weight by the ALJ.
    He examined Spivey in May 1996 (in connection with a workers’ compensation claim) and
    reported four diagnoses: (1) coal workers’ (or medical) pneumoconiosis based on a positive
    x-ray and the significant duration of Spivey’s exposure to coal dust; (2) moderate resting
    arterial hypoxemia based on the results of arterial blood gas studies; (3) chronic obstructive
    airway disease (COPD) with moderate ventilatory defect based on the results of pulmonary
    function studies he administered; and (4) chronic bronchitis based on Spivey’s history of
    difficulty breathing, shortness of breath, dyspnea on exertion, and daily symptoms of cough,
    sputum production and wheezing. Concluding that Spivey was disabled and that his
    condition was related to his prior work, Dr. Baker relied on a positive x-ray interpretation,
    Spivey’s significant exposure to coal dust, his minimal smoking history, and the absence of
    any other condition that would account for his respiratory changes.
    Dr. Baker reexamined Spivey in May 1998, at the request of the DOL, and again
    diagnosed coal workers’ pneumoconiosis, COPD with moderate ventilatory defect, moderate
    resting arterial hypoxemia, and chronic bronchitis. Dr. Baker again concluded that Spivey
    was disabled, but noted that the results of the pulmonary function tests administered at that
    time were questionable. In fact, the results of those pulmonary function studies were
    evaluated by Dr. Burki, at the DOL’s request, and found to be invalid. When Dr. Baker
    repeated the pulmonary function studies on June 18, 1998, however, he obtained nearly
    No. 04-4297                                                                                                6
    identical results that were subsequently validated by Dr. Burki. Five pulmonary function
    studies were conducted in all, but only the June 1998 results were found to be valid. The
    validated results reflected a moderate obstructive impairment.6
    The other opinion given weight by the ALJ was from Dr. Kiser, a family practitioner
    who was Spivey’s treating physician. Dr. Kiser did not prepare a written report, but provided
    his treatment notes from a visit on April 29, 1999. The notes from that date reported that
    Spivey had dyspnea on exertion of 20 feet, was unable to climb stairs, and experienced
    shortness of breath going from the bed to the bathroom. This was consistent with Spivey’s
    testimony before the ALJ in July 1999. The treatment notes referenced both a positive x-ray
    reading and the results of the validated pulmonary function studies, and diagnosed Spivey
    as having “coal workers’ pneumoconiosis with dyspnea on exertion of 20 feet,” controlled
    hypertension, and mild ventricular dilation noted on echocardiogram. Dr. Kiser also stated,
    without explanation, that in his opinion Spivey had a disabling pulmonary condition that was
    due at least in part to coal workers’ pneumoconiosis.
    In November 1998, Dr. Fino examined Spivey at the request of Mountain Clay. Dr.
    Fino found that Spivey had no respiratory impairment at all, did not suffer from any
    occupationally acquired pulmonary condition, and retained the respiratory capacity to
    perform even heavy work. Dr. Fino explained that the x-ray he reviewed was negative, that
    the blood gas studies were normal, and that pulmonary function studies he administered,
    6
    Although Spivey’s validated results would qualify a 71-year-old man of any height as disabled under
    the regulations, the table provided no values for a man who was 73 years of age. The BRB reversed the
    ALJ’s reliance on the tables in finding total respiratory disability, but concluded that the medical opinion
    evidence and work history provided substantial evidence to support a finding of total respiratory disability.
    No. 04-4297                                                                                7
    although not valid, showed normal diffusing capacities and unreduced total lung capacity that
    would rule out significant pulmonary fibrosis or restrictive lung disease. The ALJ discounted
    Dr. Fino’s opinion in part because he relied on the absence of objective evidence of
    pulmonary impairment, but did not mention or take into account the validated pulmonary
    function studies from June 1998 that indicated moderate obstructive impairment. The BRB
    found that the ALJ was within her discretion in according this opinion little weight because
    it was based on an incomplete picture of Spivey’s condition.
    The remaining four opinions, all discounted in whole or part by the ALJ, were based
    on a review of medical records. In January 1999, Dr. Younes stated in response to a
    questionnaire from the DOL that Spivey had a disabling restrictive impairment that was
    “probably” due to occupational dust exposure with smoking as a contributing factor. But,
    the ALJ did not give this opinion much weight because it was equivocal and not reasoned.
    In March and July 1999, Drs. Chandler, Broudy, and Branscomb reviewed Spivey’s medical
    records at the petitioner’s request.
    Dr. Branscomb found no evidence of coal workers’ pneumoconiosis, of an impairment
    due to coal dust exposure, or of an inability to perform his previous coal mine or comparable
    work. His opinion rested on negative x-ray evidence, normal blood gas studies, and his
    analysis of several of the invalidated pulmonary function studies. Summarizing, Dr.
    Branscomb concluded that because there were no objective tests actually measuring Spivey’s
    ability to breathe, there was no valid objective evidence of any pulmonary impairment. The
    ALJ discredited this opinion both initially and after remand for several reasons, including
    that Dr. Branscomb did not mention or evaluate the validated pulmonary function studies
    No. 04-4297                                                                                                 8
    from June 1998.
    Drs. Chandler and Broudy both found Spivey had a pulmonary impairment and was
    disabled from his prior work, but they nonetheless concluded based on the negative x-ray
    evidence that his impairment was not due to pneumoconiosis. The BRB found that the ALJ
    was justified in discounting these opinions because they simply restated the negative x-ray
    results. Cornett v. Benham Coal, Inc., 
    227 F.3d 569
    , 576 (6th Cir. 2000) (agreeing that
    restatement of x-ray does not constitute reasoned medical judgment); 20 C.F.R. § 718.202(b)
    (“No claim for benefits shall be denied solely on the basis of a negative chest X-ray.”).
    III.
    This court must affirm a final decision of the BRB unless it has committed legal error
    or exceeded its scope of review of the ALJ’s findings. 
    Cornett, 227 F.3d at 575
    . The ALJ’s
    findings are conclusive if they are supported by substantial evidence and conform to
    applicable law. Martin v. Ligon Prep. Co., 
    400 F.3d 302
    , 305 (6th Cir. 2005). Substantial
    evidence is that evidence which a reasonable mind might accept as adequate to support a
    conclusion, “‘even if the facts permit an alternative conclusion.’” Peabody Coal Co. v.
    Odom, 
    342 F.3d 486
    , 489 (6th Cir. 2003) (quoting Youghiogheny & Ohio Coal Co. v. Webb,
    
    49 F.3d 244
    , 246 (6th Cir. 1995)).7
    To prove entitlement to black lung benefits, a miner must show by preponderance of
    the evidence that he has pneumoconiosis, that his pneumoconiosis arose out of his coal
    7
    Spivey states in his brief that he is entitled to the benefit of all doubt. However, the Supreme Court
    has held that the DOL’s “true doubt” rule, under which evenly balanced evidence was resolved in the
    claimant’s favor, impermissibly shifted the burden of proof away from the claimant and violated § 7 of the
    APA. Dir., OWCP v. Greenwich Collieries, 
    512 U.S. 267
    , 281 (1994).
    No. 04-4297                                                                                             9
    mining employment, that he has a totally disabling respiratory condition, and that his
    disability is due at least in part to his pneumoconiosis. Adams v. Dir., OWCP, 
    886 F.2d 818
    ,
    826 (6th Cir. 1989). Because this claim was filed more than a year after the denial of his first
    claim for benefits, Spivey must first prove “a material change in conditions” since the denial
    of his first claim for benefits. 20 C.F.R. § 725.309(d) (1999).8 Proof of a material change
    in condition protects the finality of the judgment on the prior claim, while recognizing that
    “res judicata is not implicated by the claimant’s physical condition or the extent of his
    disability at two different times.” Sharondale Corp. v. Ross, 
    42 F.3d 993
    , 998 (6th Cir.
    1994).
    A.       Material Change in Condition
    To award benefits on a claim filed more than a year after the denial of an earlier claim,
    the ALJ must first determine, based on all the evidence accompanying the new claim, that
    the miner has proved at least one of the elements of entitlement previously adjudicated
    against him. 
    Ross, 42 F.3d at 997
    ; see also Grundy Mining Co. v. Flynn, 
    353 F.3d 467
    , 480
    (6th Cir. 2003). This court explained in Kirk, a case decided after the ALJ issued her second
    opinion, that to consider only the new evidence might allow relitigation of claims in which
    the old and new evidence was essentially the same but some legal error resulted in the denial
    of the first claim. Tenn. Consol. Coal Co. v. Kirk, 
    264 F.3d 602
    , 609 (6th Cir. 2001). “A
    ‘material change’ exists only if the new evidence both establishes the element and is
    8
    Although 20 C.F.R. § 725.309(d) was revised effective on January 19, 2001, the new provision does
    not apply to claims such as this one that were pending on the effective date. See 20 C.F.R. § 725.2(c);
    Grundy Mining Co. v. Flynn, 
    353 F.3d 467
    , 476 n.3 (6th Cir. 2003) (current version, which does not include
    the “material change” language, does not apply to claims pending at the time it was adopted).
    No. 04-4297                                                                               10
    substantially more supportive of claimant.” 
    Id. The actual
    difference between the bodies of
    evidence represents the “change,” while the “materiality” of the change is “marked by the
    fact that this difference has the capability of converting an issue determined against the
    claimant into one determined in his favor.” 
    Id. at n.6.
    For this reason, we held that the ALJ
    must also find, based on a comparison of the sum of the new evidence and the sum of the
    evidence considered in connection with the previously denied claim, that the evidence is
    sufficiently more supportive of the claim so as to warrant a change in outcome. Id; see also
    
    Grundy, 353 F.3d at 480
    .
    Whether the ALJ and BRB applied the appropriate “material change” standard is a
    question of law that we review de novo. 
    Grundy, 353 F.3d at 476
    . To the extent the
    determination rests upon factual findings, they are reviewed under the substantial evidence
    standard. 
    Id. 1. Findings
    The ALJ found that a material change in condition had been established because the
    new evidence established pneumoconiosis—an element previously adjudicated against
    Spivey. However, as petitioner argues, the ALJ made no findings comparing the old and new
    bodies of evidence to determine the materiality of the change. This error was raised by
    Mountain Clay in its second appeal to the BRB. Although vacating the award for other
    reasons, the BRB found that the failure to make this comparison was harmless error in this
    case. The BRB explained that:
    A review of the record in this case reveals that the earlier evidence on
    which the denial of claimant’s prior claim was premised contains no evidence
    of pneumoconiosis or disability, see Director’s Exhibit 34. The evidence
    No. 04-4297                                                                               11
    submitted with claimant’s prior claim consists of four negative readings of two
    x-rays, two non-qualifying pulmonary function studies and two non-qualifying
    blood gas studies, as well as medical opinions from Drs. Dahhan and Broudy,
    neither of whom diagnosed pneumoconiosis or found that the claimant was
    totally disabled, 
    id. Thus, as
    there was no evidence of pneumoconiosis in the
    earlier claim, any error by the administrative law judge in failing to compare
    the sum of the new evidence, which the administrative law judge found
    established the existence of pneumoconiosis, with the earlier evidence, on
    which the denial of claimant’s prior claim had been premised, in accordance
    with the Sixth Circuit’s holdings in 
    Kirk, supra
    , and 
    Ross, supra
    , was
    harmless[.]
    Petitioner contends that the BRB exceeded the scope of its review in finding this error was
    harmless. While the BRB reviews the ALJ’s factual findings under the substantial evidence
    standard, even the case cited by petitioner recognized that the harmless-error doctrine can
    apply in this context. Sahara Coal Co. v. OWCP, U.S. Dept. of Labor, 
    946 F.2d 554
    , 558
    (7th Cir. 1991) (“If the outcome of a remand is foreordained, we need not order one.”). The
    error in Sahara was not harmless because comparison of the old and new medical evidence
    presented a factual issue.
    Similarly, this court remanded for further findings in Ross, but only after comparison
    of the evidence revealed a factual question on whether there was a material change in
    condition. There, the ALJ specifically found that new positive x-ray evidence established
    pneumoconiosis and therefore also a material change in condition, but did not discuss how
    the evidence differed qualitatively between the new and old claims. That did not end the
    inquiry, however, as this court then compared the two bodies of evidence. Because the
    record showed there was evidence of both positive and negative x-ray interpretations
    accompanying the new as well as the old claims, the court could not discern from the record
    whether the ALJ had merely reached a different decision on essentially the same evidence
    No. 04-4297                                                                                  12
    or whether the claimant had shown a material change in his condition since the earlier denial.
    As a result, the claim was remanded for further findings.
    In contrast, remand was not required in Kirk, despite the ALJ’s errors in assessing
    whether there was a material change, because there was substantial evidence in the developed
    record to support a finding that the claimant had demonstrated a material change in condition
    as to an element previously adjudicated against him. With respect to the material change, the
    court explained that: “Although there had been some diagnoses of pneumoconiosis prior to
    [the denial of his first claim], its presence has become generally acknowledged among his
    treating physicians after the filing of his fourth claim.” 
    Kirk, 264 F.3d at 609
    . The court also
    noted that it was not necessary for there to be a complete absence of evidence of
    pneumoconiosis at the earlier date; only that there was a substantial difference in the two
    bodies of evidence. 
    Id. at 609-10.
    Because both the ALJ and BRB in Kirk relied on the new
    evidence of pneumoconiosis, a factual record had been developed on the element, albeit not
    in relation to the material change requirement, that was sufficient to support the BRB’s
    conclusion that the claimant had proved a material change in condition. 
    Id. at 610.
    In this case, comparison of the bodies of evidence from the new and old claims does
    not reveal a factual question that must be remanded to the ALJ. The record shows that while
    the sum of the evidence submitted with the earlier claim included no findings of
    pneumoconiosis or disability, the sum of the later evidence included two findings of
    pneumoconiosis, one validated pulmonary function test showing moderate pulmonary
    impairment, and the recognition by five out of seven physicians that Spivey had a totally
    No. 04-4297                                                                                               13
    disabling respiratory impairment.9 We have no trouble finding that substantial evidence in
    the record supports a finding that the new evidence demonstrates a material change in
    condition when compared to the evidence on which the first denial was premised with respect
    to not only the existence of pneumoconiosis but also the element of disability. Therefore,
    we agree that the ALJ’s failure to compare the new and old evidence was harmless error.
    2.      Materiality
    Stepping away from the standard articulated in Kirk, Mountain Clay draws on general
    principles of finality and res judicata to argue that the change in Spivey’s condition could
    not have been material absent proof either that he had additional coal dust exposure since the
    denial of the prior claim, or that he had a type of pneumoconiosis (such as massive fibrosis
    or silicosis) known to be latent or progressive in the absence of further coal dust exposure.
    In support of this contention, Mountain Clay suggests that this court has previously relied on
    the miner’s return to coal mine work in evaluating the material change requirement. On the
    contrary, none of the cases cited placed importance on continued coal dust exposure in
    evaluating whether a change in condition had been established.
    In Ross, the miner’s return to work between the denial of the first and the filing of the
    second claims was deemed relevant to the statute of limitation issue, but was not mentioned
    in connection with adoption of the standard for proving a material change in 
    conditions. 42 F.3d at 996
    . On the other hand, the fact that the miner in Grundy worked until just before
    filing his second claim for benefits was not mentioned as part of the material change
    9
    In fact, Dr. Broudy, the only physician to evaluate Spivey in connection with both claims, found no
    disability at the time of the first claim and total disability at the time of the second.
    No. 04-4297                                                                               14
    calculus. 
    Grundy, 353 F.3d at 471
    . All that is required for materiality is that the new
    evidence be sufficiently different to warrant a different outcome on one or more elements of
    entitlement. 
    Id. at 482.
    Mountain Clay is arguing, at bottom, that there is no proof that legal pneumoconiosis
    is capable of progression or latent manifestation after the miner’s exposure to coal dust has
    ended. This is not the first time we have been asked to hold that a miner cannot develop
    legal pneumoconiosis arising out of coal mine employment without experiencing additional
    exposure to coal dust. We rejected just such an argument in Odom, reiterating that
    pneumoconiosis has been recognized as progressive in nature. Peabody Coal Co. v. Odom,
    
    342 F.3d 486
    , 491 (6th Cir. 2003). It is petitioner’s position that Odom is not controlling
    because it relied on case law that predated the DOL’s review of the medical literature in
    revising the regulations to provide that “‘pneumoconiosis’ is recognized as a latent and
    progressive disease which may first become detectable only after the cessation of coal mine
    dust exposure.” 20 C.F.R. § 718.201(c).
    This revision was upheld against a challenge by the National Mining Association
    (NMA), but only upon the DOL’s concession that, while pneumoconiosis may be latent and
    progressive, “the most common forms of pneumoconiosis are not latent” and “latent and
    progressive pneumoconiosis is rare.” Nat’l Mining Ass’n v. Dept. of Labor, 
    292 F.3d 849
    ,
    863 (D.C. Cir. 2002). Although the NMA argued that the revised regulation created an
    irrebuttable presumption that pneumoconiosis was progressive, the court held that the
    regulation “simply prevents operators from claiming that pneumoconiosis is never latent and
    progressive.” 
    Id. (emphasis in
    original).
    No. 04-4297                                                                                15
    The NMA also argued that the regulation was not supported by the scientific studies,
    two of which reported that pneumoconiosis is latent and progressive in at most 8%, or as
    many as 24% of cases. 
    Id. at 869.
    The court construed the regulation narrowly to mean, as
    counsel for the DOL conceded at oral argument, that pneumoconiosis can be a progressive
    and latent disease. Id.; see also Midland Coal Co. v. Dir., OWCP (Shores), 
    358 F.3d 486
    ,
    490 (7th Cir. 2004) (holding that DOL’s conclusion that scientific evidence showed
    pneumoconiosis can be latent and progressive was entitled to deference). Further, the
    Seventh Circuit in Shores expressly held that the decision in National Mining does not
    require a miner bringing a second or subsequent claim for benefits to prove that he suffered
    from a type of pneumoconiosis that has been found in the medical literature to be progressive
    and/or latent. 
    Shores, 358 F.3d at 491
    . We agree that proof of a material change in
    conditions based on a finding of pnemoconiosis does not require the claimant to prove either
    exposure to coal dust since the denial of his first claim, or that he has a kind of
    pneumoconiosis known to be latent and progressive.
    B.     Substantial Evidence
    On the merits, Mountain Clay maintains that substantial evidence does not support the
    ALJ’s findings on causation; specifically, that Spivey established pneumoconiosis arising out
    of his coal mine employment and that his total respiratory disability was due at least in part
    to his pneumoconiosis. No challenge is made to the ALJ’s findings, based on the credible
    medical opinion evidence, that Spivey had chronic obstructive pulmonary disease (COPD)
    or that he was totally disabled from his prior coal mine or comparable work. Nor does
    Mountain Clay contend that the ALJ erred in deciding to discount in whole or part the
    No. 04-4297                                                                              16
    opinions of Drs. Fino, Branscomb, Chandler, Broudy, and Younes.
    Before attacking the ALJ’s reliance on the credited opinions, petitioner asserts that
    the ALJ impermissibly shifted the burden of proof from the claimant by crediting the
    opinions of Drs. Baker and Kiser simply because she was not persuaded by the other medical
    opinions. It is clear, however, that the ALJ’s findings were based on the medical opinion
    evidence that she found was credible and reasoned and not simply a lack of credible evidence
    to the contrary. As petitioner acknowledges, the existence of legal pneumoconiosis and
    disability due to pneumoconiosis, as well as the causes of a miner’s total disability may be
    established through a physician’s reasoned and supported medical opinion based on objective
    medical evidence such as x-rays, blood gas and pulmonary function studies, physical
    examination, and medical and work histories. 20 C.F.R. § 718.202(a)(4), and 20 C.F.R. §
    718.204(b)(2)(iv) and(c)(2). The ALJ’s assessment of the medical opinion evidence is a
    credibility issue that we review for substantial evidence. 
    Grundy, 353 F.3d at 484
    .
    1.     Dr. Kiser’s Opinion
    The ALJ credited the opinion of Dr. Kiser in her initial opinion and after remand.
    Noting that his opinion was based on a positive x-ray interpretation and the validated
    pulmonary function studies, the ALJ emphasized that: “Dr. Kiser has been Mr. Spivey’s
    treating physician for five years, and is thus familiar with his history and symptoms over
    time. His conclusions are based on his examinations of Mr. Spivey, Mr. Spivey’s clinical
    symptoms, and the objective laboratory test results.” Petitioner objected to the weight the
    ALJ accorded his opinion for several reasons, including that the ALJ had mechanically
    accorded it greater weight based solely on his status as a treating physician.
    No. 04-4297                                                                                17
    The BRB twice found that the ALJ had provided a reasoned basis for crediting the
    treating physician’s opinion over other medical opinions. In denying reconsideration, the
    BRB also found that the reasons given by the ALJ for crediting Dr. Kiser’s opinion were
    consistent with this court’s holding that a physician’s opinion is not entitled to any greater
    weight based solely on his status as a treating physician. Eastover Mining Co. v. Williams,
    
    338 F.3d 501
    , 511-13 (6th Cir. 2003) (abrogating Tussey v. Island Creek Coal Co., 
    982 F.2d 1036
    (6th Cir. 1993)). Rather, the weight to be accorded a treating physician’s opinion is
    based on its power to persuade. 
    Id. at 513;
    see also 20 C.F.R. § 718.104(d).
    We find, however, that the medical records from Dr. Kiser—namely, the treatment
    notes and response to the letter from Spivey’s counsel—do not provide any basis for
    crediting his opinion except for the fact that he was a treating physician who must have been
    familiar with Spivey’s history and condition. More importantly, as the Director concedes on
    appeal, Dr. Kiser diagnosed only coal worker’s pneumoconiosis, which the ALJ found had
    not been proved, and offered no opinion to support a finding of legal pneumoconiosis. Also,
    while Dr. Kiser agreed that Spivey had a disabling pulmonary condition, he provided no
    basis for that conclusion. As a result, we conclude that Dr. Kiser’s opinion does not provide
    substantial evidence to support the ALJ’s findings of legal pneumoconiosis and disability due
    at least in part to pneumoconiosis. This brings us to Dr. Baker’s opinion, which the record
    shows was accorded the greatest weight.
    2.     Dr. Baker’s Opinion
    Dr. Baker, who examined Spivey twice and reviewed all the medical opinion
    evidence, made the following diagnoses: (1) coal workers’ pneumoconiosis based on a
    No. 04-4297                                                                                18
    positive x-ray and Spivey’s significant history of coal dust exposure; (2) COPD with
    moderate ventilatory defect based on the pulmonary function studies; (3) moderate resting
    arterial hypoxemia based on the results of arterial blood gas studies; and (4) chronic
    bronchitis based on his history of difficulty breathing, shortness of breath, dyspnea on
    exertion, and daily symptoms of cough, sputum production, and wheezing. He specifically
    found that the first two diagnoses were related to Spivey’s coal mine employment: clinical
    pneumoconiosis because of his long history of coal dust exposure and no other condition that
    would produce abnormal x-ray results; and COPD because of his lengthy exposure to coal
    dust, his minimal history of cigarette smoking, and the absence of any other condition that
    would account for his respiratory changes. Dr. Baker also stated that Spivey has “obstructive
    airway disease related to the inhalation of coal dust which is a known cause of obstructive
    airway disease.” In reaching his opinion, Dr. Baker relied on the physical examinations he
    performed, Spivey’s personal and work histories, the only validated pulmonary function
    studies in the record, and the positive interpretations of the x-ray evidence.
    Mountain Clay contends that substantial evidence does not support the ALJ’s finding
    that Dr. Baker’s opinion was well-reasoned and consistent with the objective medical
    evidence for several reasons. First, petitioner points to Dr. Baker’s reliance on the positive
    x-ray interpretations that the ALJ found were outweighed by the negative x-ray readings.
    The ALJ acknowledged this, but found that rejection of the underlying positive x-ray
    evidence did not significantly detract from the weight Dr. Baker’s opinion should receive
    because his opinion was also based on other objective evidence. This, it is argued, was error
    because it is not clear that Dr. Baker would have given the same opinion if he had assumed
    No. 04-4297                                                                                  19
    the x-ray evidence was negative. We disagree. Dr. Baker provided independent diagnoses
    of coal workers’ pneumoconiosis, which did rely on the positive x-ray readings, and COPD,
    which did not. Nor is petitioner’s reliance on Cornett persuasive. Cornett v. Benham Coal,
    Inc., 
    227 F.3d 569
    , 576 (6th Cir. 2000).
    In Cornett, the ALJ discredited the medical opinion evidence (including an opinion
    from Dr. Baker) in denying the claim for benefits. We held that the ALJ erred by
    mischaracterizing the medical opinion evidence as being merely a restatement of the positive
    x-ray evidence when the record actually showed that the opinions were based on factors other
    than the positive x-ray results, such as physical examinations, work history, smoking history,
    and pulmonary function studies. This was particularly true, we noted, since Dr. Baker had
    also stated that the objective and clinical evidence supported a diagnosis of coal workers’
    pneumoconiosis notwithstanding a negative x-ray. In this case, the ALJ credited Dr. Baker’s
    opinion, recognizing that it was based on other objective evidence, and relied on it in finding
    the existence of legal pneumoconiosis and disability due to pneumoconiosis.
    Finally, arguing that the ALJ erred in crediting Dr. Baker’s opinion as to causation,
    petitioner argues that he failed to provide a reasoned basis for finding disease causation (that
    his COPD was substantially related to coal dust exposure), and did not consider the possible
    role of other risk factors in finding disability causation (that his pneumoconiosis is a
    substantially contributing cause of his disability). First, Dr. Baker explained that Spivey had
    many years of exposure to coal dust, which is a known cause of obstructive airway
    impairment, and no other condition that would explain his impairment. This provided a
    reasoned basis for the opinion. Second, petitioner faults Dr. Baker for not considering the
    No. 04-4297                                                                           20
    possibility that Spivey’s COPD could have been caused by age, obesity, or hypertension.
    Yet, in finding causation, Dr. Baker noted the absence of any other condition that would
    account for Spivey’s respiratory changes. Nor is this a case in which conflicting medical
    opinions attributed the miner’s chronic lung impairment to other causes (i.e., cigarette
    smoking). We find the ALJ’s assessment of Dr. Baker’s medical opinion is supported by
    substantial evidence.
    The BRB’s decision and order awarding black lung benefits to Spivey is
    AFFIRMED.