Cedar Rapids Community School District and EMC Insurance Companies v. Christine Pease ( 2011 )


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  •                IN THE SUPREME COURT OF IOWA
    No. 09–0724
    Filed December 16, 2011
    CEDAR RAPIDS COMMUNITY SCHOOL DISTRICT
    and EMC INSURANCE COMPANIES,
    Appellants,
    vs.
    CHRISTINE PEASE,
    Appellee.
    On review from the Iowa Court of Appeals.
    Appeal from the Iowa District Court for Polk County, Scott D.
    Rosenberg, Judge.
    On further review, we address whether substantial evidence
    supports the workers’ compensation commissioner’s findings of fact.
    DECISION OF COURT OF APPEALS VACATED; DISTRICT COURT
    JUDGMENT AFFIRMED.
    Tina M. Eick and Wendy D. Boka of Hopkins & Huebner, P.C.,
    Des Moines, for appellants.
    Thomas M. Wertz and Daniel J. Anderson of Wertz & Dake, Cedar
    Rapids, for appellee.
    2
    APPEL, Justice.
    In this workers’ compensation case, we consider whether the court
    of appeals properly applied the “substantial evidence” test under Iowa
    Code section 17A.19(10)(f) (2009) when it reversed an award of benefits
    in an appeal of a decision of the workers’ compensation commission.
    Based on our review of the record, we conclude substantial evidence
    supports the commissioner’s findings.         As a result, we vacate the
    decision of the court of appeals and affirm the judgment of the district
    court.
    I. Factual and Procedural Background.
    Christine Pease injured her right ankle when she slipped on ice
    and fell in the course of her employment with the Cedar Rapids
    Community School District (District) as a “job coach.” The position of job
    coach involved working with disabled children, transporting them to
    various locations in the community in the school van.
    Pease filed a claim with the workers’ compensation commission
    seeking benefits as a result of her alleged injuries.     While the parties
    stipulated that Pease suffered a right ankle injury as a result of the slip
    and fall and that the injury arose within the scope of employment, the
    District disputed “the nature, scope and effect of the injury.”
    Pease’s ankle injury required her to undergo two surgeries related
    to the placement and removal of a screw. In addition, Pease claimed that
    her fall caused her to have an altered gait, which in turn caused her to
    sustain an injury to her left ankle and back. Pease further maintained
    that her injuries increased her preexisting state of depression.
    At the hearing, Pease offered evidence in support of her claim that
    her right ankle injury caused a change in gait which subsequently
    caused injuries to her left ankle and back.      With respect to her right
    3
    ankle, Pease offered the testimony of a physician that she suffered “a
    rather significant ligamentous injury to her right ankle involving both the
    deltoid and syndesmotic ligament.”       She then reported to another
    physician that she began experiencing low back pain due to her altered
    gait. Although Pease sought treatment for lower back pain before, her
    physician noted that her back pain had become more difficult to control
    after her fall. In addition, Pease reported that she began to experience
    pain in her left ankle due to her altered gait.     Pease, however, had a
    history of problems with her left ankle, which included a chronic tear of
    ligaments and two arthroscopic surgeries prior to her slip and fall
    involved in this case.
    According to Pease, after she had reached maximum medical
    improvement she was asked to undergo a functional capacity evaluation.
    The results of the functional capacity evaluation indicated that Pease
    could stand or walk no more than fifty percent of her work shift and for
    limited durations; could lift twenty pounds rarely, fifteen pounds
    occasionally, and seven to eight pounds frequently; could tolerate a
    maximum of ten to twelve stairs up and down once a day using handrails
    for support; and should avoid ladder or step climbing greater than an
    eight inch height. Her physician characterized these work restrictions as
    “permanent.”
    More than four months later, the District terminated Pease’s
    employment. The District stated that Pease had been unable to return to
    work since her injury and, in light of the permanent restrictions, she was
    unable to perform the essential functions of the position of job coach or
    any other job with the District in her pay range.
    After her termination from employment, Pease became increasingly
    depressed and sought medical help for this condition.        Pease had a
    4
    history of depression prior to her work injury, but testified her
    depression became much worse following the injury. She testified that
    her constant pain, inability to walk, loss of her job, and her increased
    stress levels all contributed to her depression and that the depression
    interfered with her concentration, her sleep, and her social life.
    Pease offered expert medical testimony in support of her claim that
    she suffered deeper depression as a result of her work injury.
    Dr. William Stutts, a psychiatrist, concluded that Pease’s work injury
    was a “substantial contributing factor[] in bringing about her current
    level of depression.” Dr. Stutts asserted it was more likely than not that
    the chronic pain resulting from her injuries was permanent and that the
    pain would continue to contribute to Pease’s depression.              Another
    physician, Dr. John Brownell, characterized Pease as suffering from a
    “pretty clear case of post-surgical depression” and further stated that the
    depression was a result of both the stress of the surgery and her
    decreased mobility.
    Pease offered the opinion of Barbara Laughlin, a vocational expert,
    in support of her claim that she was no longer employable.           Laughlin
    asserted that Pease suffered a ninety to one hundred percent loss of
    access to the labor market as a result of her injuries. Laughlin stated
    that   Pease   would   have   great   difficulty   finding   and   maintaining
    employment in light of her inability to interact appropriately with peers,
    the general public, and supervisors.
    The District countered by offering evidence that tended to
    characterize Pease’s injuries as less substantial.       After performing an
    independent medical examination, Dr. Ray Miller opined that Pease had
    an eight percent of the whole person impairment due to the right ankle
    injury and the subsequent sequelae to the back and left ankle.
    5
    With respect to the claim of depression, the District offered
    evidence from Dr. Raymond Crowe indicating that Pease’s depressive
    episode was not causally connected to the injury.               Dr. Crowe later
    asserted that Pease was malingering.
    The District offered a vocational report prepared by Dr. Elizabeth
    Mease and Dr. Janeen Montgomery.                 They opined that Pease was
    employable at the sedentary physical level and was not psychiatrically
    foreclosed from employment.
    The deputy commissioner ruled in favor of Pease.           The deputy
    concluded that Pease suffered “an injury to the body as a whole.”
    Additionally, the deputy found that Pease’s work injury was a
    “substantial contributory factor in [Pease’s] current state of depression.”
    Further, the deputy held that as a result of her physical and
    psychological injuries, Pease was “unable to return to any job she ha[d]
    previously held.” As a result, the deputy awarded Pease permanent total
    disability, accrued benefits, and reimbursement for medical expenses.
    The commissioner affirmed the decision of the deputy, but
    modified and expanded on the deputy’s ruling. The commissioner noted
    that the deputy had erroneously stated that Dr. Miller had assigned an
    eight percent permanent disability rating to the injuries to the right
    ankle, neck, lower back, and left ankle when, in fact, Dr. Miller assigned
    the disability rating based only on the injuries to Pease’s lower back and
    left ankle. The commissioner concluded that this error had no impact on
    the case.
    The commissioner further considered whether the deputy erred in
    failing     to   apportion   Pease’s   alleged   preexisting   disability.   The
    commissioner noted that this issue was not raised before the deputy and
    was not preserved for appeal.
    6
    The district court affirmed in part and reversed in part.          The
    district court first concluded that the commissioner applied the
    appropriate standard of review and correctly held the District failed to
    preserve error on the apportionment issue.         The district court also
    upheld the commissioner’s findings of fact with respect to the causation
    of Pease’s mental and physical injuries.      The court observed that the
    commissioner favored the findings of Dr. Miller and Dr. Stutts and
    concluded that, on the whole, substantial evidence supported the
    commissioner’s findings. Further, the district court held that substantial
    evidence supported the commissioner’s findings regarding disability. The
    court reversed, however, the commissioner’s award of medical expenses
    for Pease’s neck injuries because there were no findings to establish that
    the neck injuries were caused by the January 26 accident. The District
    appealed, and the court of appeals reversed and remanded.
    The court of appeals held substantial evidence did not support the
    commissioner’s findings on causation.          The court questioned the
    reliability of Dr. Miller’s conclusions, observing that Dr. Miller’s reliance
    on the history provided by Pease was misplaced because other evidence,
    including    video    surveillance,   undermined      Pease’s    credibility.
    Additionally, the court noted that Dr. Miller incorrectly believed Dr. Kline
    opined that Pease’s back pain was caused by the January 26 accident
    when, in fact, Dr. Kline concluded the opposite.        Further, the court
    questioned the conclusions of Dr. Stutts, explaining that Dr. Stutts’
    opinion rested, in part, on an inaccurate and incomplete history of
    depression provided by Pease.         Finally, the court discussed the
    conflicting evidence and Pease’s “lengthy history of symptoms” relating to
    the injuries and concluded medical causation was lacking between the
    January 26 accident and the injuries to Pease’s left ankle, lower back,
    7
    and postaccident level of depression. Pease applied for further review,
    which we granted.
    II. Standard of Review.
    Our decision is controlled in large part by the deference we afford
    to decisions of administrative agencies.    Medical causation presents a
    question of fact that is vested in the discretion of the workers’
    compensation commission. See Dunlavey v. Econ. Fire & Cas. Co., 
    526 N.W.2d 845
    , 853 (Iowa 1995).          We will therefore only disturb the
    commissioner’s finding of medical causation if it is not supported by
    substantial evidence. See Iowa Code § 17A.19(10)(f).
    The Iowa Administrative Procedure Act defines “substantial
    evidence” as follows:
    [T]he quantity and quality of evidence that would be deemed
    sufficient by a neutral, detached, and reasonable person, to
    establish the fact at issue when the consequences resulting
    from the establishment of that fact are understood to be
    serious and of great importance.
    Id. § 17A.19(10)(f)(1).   When reviewing a finding of fact for substantial
    evidence, we judge the finding “in light of all the relevant evidence in the
    record cited by any party that detracts from that finding as well as all of
    the relevant evidence in the record cited by any party that supports it.”
    Id. § 17A.19(10)(f)(3). Our review of the record is “fairly intensive,” and
    we do not simply rubber stamp the agency finding of fact.         Wal-Mart
    Stores, Inc. v. Caselman, 
    657 N.W.2d 493
    , 499 (Iowa 2003).
    Evidence is not insubstantial merely because different conclusions
    may be drawn from the evidence. John Deere Dubuque Works of Deere &
    Co. v. Weyant, 
    442 N.W.2d 101
    , 105 (Iowa 1989). To that end, evidence
    may be substantial even though we may have drawn a different
    conclusion as fact finder. Ardnt v. City of Le Claire, 
    728 N.W.2d 389
    , 393
    8
    (Iowa 2007); Missman v. Iowa Dep’t of Transp., 
    653 N.W.2d 363
    , 367
    (Iowa 2002).         Our task, therefore, is not to determine whether the
    evidence supports a different finding; rather, our task is to determine
    whether substantial evidence, viewing the record as a whole, supports
    the findings actually made.        See Iowa Code § 17A.19(10)(f); Schutjer v.
    Algona Manor Care Ctr., 
    780 N.W.2d 549
    , 557–58 (Iowa 2010).
    III. Discussion.
    At the heart of this case is the issue of the extent to which expert
    testimony constitutes substantial evidence in a workers’ compensation
    claim.     Experts for the parties gave conflicting opinions regarding the
    causation of Pease’s postaccident physical and psychological injuries.
    The commissioner ultimately determined the expert opinions offered by
    Pease were more credible and gave their opinions more weight.              The
    District now asks us to hold that the opinions relied upon by the
    commissioner were so flawed that they failed to constitute substantial
    evidence supporting the commissioner’s findings. We decline to do so.
    Medical causation “is essentially within the domain of expert
    testimony.” Dunlavey, 526 N.W.2d at 853. The commissioner, as trier of
    fact, has a duty to weigh the evidence and measure the credibility of
    witnesses.     Id.    The weight given to expert testimony depends on the
    “accuracy of the facts relied upon by the expert and other surrounding
    circumstances.” Schutjer, 780 N.W.2d at 560 (internal quotation marks
    omitted). Also, an expert’s opinion is not necessarily binding upon the
    commissioner if the opinion is based on an incomplete history.
    Dunlavey, 526 N.W.2d at 853. Ultimately, however, the determination of
    whether to accept or reject an expert opinion is within the “peculiar
    province” of the commissioner.        Deaver v. Armstrong Rubber Co., 
    170 N.W.2d 455
    ,     464   (Iowa   1969).    The   District   challenges   the
    9
    commissioner’s medical causation findings relating to Pease’s left ankle
    and lower back as well as her postaccident level of depression.        We
    discuss each separately.
    A.    Medical Causation of Pease’s Left Ankle and Lower Back
    Injuries.    The commissioner primarily relied upon the opinions of
    Dr. Miller in concluding Pease’s work injury aggravated the injuries to
    her left ankle and lower back.     Dr. Miller performed an independent
    medical examination of Pease in March 2006.           Dr. Miller reviewed
    medical records from Physicians’ Clinic of Iowa, the University of Iowa
    Orthopedic Department, Dr. Brownell, Dr. Fortson, St. Luke’s Hospital,
    Dr. Kline, St. Luke’s Therapy Plus, University of Iowa Psychiatry
    Department, and Jennifer Bradley ARNP from Mercy Psychiatric Center.
    He also had x-rays available from St. Luke’s Hospital and the Physicians
    Clinic of Iowa.    In addition to reviewing Pease’s medical records,
    Dr. Miller personally performed a physical examination of Pease. Based
    on his review of the medical records and his personal examination,
    Dr. Miller opined to a reasonable degree of medical certainty that Pease’s
    left ankle and lower back injuries were aggravated by the January 26,
    2005 accident.
    Dr. Miller explained that the injury to Pease’s right ankle
    aggravated her “preexisting osteoarthritis of the left ankle.”   Dr. Miller
    observed that Pease experienced “an increase in . . . symptoms of pain
    related to weight-bearing that have continued since the time of the fall of
    01/26/2005, and, therefore, are felt to be an aggravation of a preexisting
    condition.” Dr. Miller’s observations of an increase in symptoms of pain
    following the accident are consistent with the medical reports submitted
    to him for his evaluation.
    10
    Pease’s ankle symptoms appeared to progress after the accident so
    she returned to the University of Iowa and was evaluated by
    Dr. Saltzman on March 16, 2005. Dr. Saltzman’s notes state that Pease
    met with Dr. Saltzman because of a “new problem in her left ankle.”
    According to the notes, Pease was “beginning to develop more problems
    with the left side. . . . What has added to this is that she fell on the ice
    and tore the syndesmosis and deltoid ligament on her right ankle.” After
    a CT scan and radiological examination, Dr. Saltzman’s impression was
    that Pease suffered central heel pain and left ankle pain.
    In April 2005, Dr. Amendola assumed the care for Pease’s left
    ankle. Pease visited Dr. Amendola on three occasions between April and
    August 2005. According to Dr. Amendola’s notes, Pease advised in April
    that she experienced some improvement with her left ankle once she was
    able to bear weight on the right. Throughout the five months, however,
    Pease reported that she continued to experience pain in her left ankle.
    In December 2005, Dr. Amendola wrote a letter to the District’s
    counsel. In the letter, Dr. Amendola advised he had been involved in the
    care of Pease from March through August of that year “for, what appears
    to be, an exacerbation of a pre-existing condition.”         Dr. Amendola
    continued, explaining, “I do agree that this patient had ongoing pre-
    existing problems in her ankle.      Therefore, this note is to clarify, in
    writing, that in fact this was an aggravation of a pre-existing condition.”
    From this review of the record, it is apparent that substantial
    evidence supports the commissioner’s finding of medical causation with
    respect to the left ankle.   Dr. Miller opined to a reasonable degree of
    medical certainty that the symptoms Pease experienced in her left ankle
    were aggravated by the increased weight-bearing requirements stemming
    from the January 26, 2005 accident. Dr. Miller’s opinion is supported by
    11
    the reports of Dr. Saltzman and Dr. Amendola, which Dr. Miller reviewed
    in formulating his opinion. Also, Dr. Amendola expressed the view that
    the left ankle problems suffered by Pease following the accident were an
    aggravation of a preexisting condition.
    Substantial evidence also supports the commissioner’s finding of
    medical   causation   between    the      work-related   accident   and   the
    aggravation of Pease’s lower back symptoms. As with the left ankle, the
    commissioner relied on Dr. Miller’s opinion concluding within a
    reasonable degree of medical certainty that the January 26, 2005
    accident aggravated Pease’s preexisting back condition.             Dr. Miller
    explained:
    Regarding Ms. Pease’s low back, for which she had a
    preexisting facet arthropathy in the lower lumbar levels,
    following her fall of 01/26/2005 she developed an increase
    in her low back symptoms that have persisted and have
    required further treatment that did not substantially
    alleviate her symptoms. I would agree with Dr. Kline’s
    assessment that Ms. Pease has had an increase in her low
    back symptoms following the work related injury of
    01/26/2005 regarding her low back, and these are related to
    the required use of crutches following surgery on her right
    ankle and alterations in her gait pattern because of the
    symptoms related to both ankles.
    Dr. Miller thus attributed the aggravation of Pease’s lower back
    symptoms to her altered gait and use of crutches following the injury to
    her right ankle.
    The District, however, argues Dr. Miller’s opinion is suspect in part
    because he relied on Dr. Kline’s assessment which, according to the
    District, “was directly to the contrary” of Dr. Miller’s conclusions. The
    District relies on a letter written by Dr. Kline, who began treating Pease
    before her accident, in which Dr. Kline stated he “would not attribute
    [Pease’s] ongoing need for treatment of her back to her ankle injury of
    12
    01/26/2005.”        Yet Dr. Kline specifically stated that he could not
    determine      within    a   reasonable    medical     certainty   that     a    causal
    relationship existed between Pease’s postaccident back pain and her
    right ankle injury.          Dr. Kline’s letter, therefore, does not wholly
    undermine Dr. Miller’s conclusions.
    In fact, Dr. Kline’s medical records generally support Dr. Miller’s
    conclusions.      In an operative report dated May 2, 2005, Dr. Kline
    observed that Pease “did well after her initial epidural steroid injection in
    January. However, she subsequently experienced a fall and injured her
    right ankle.     This reinjured her back.          Her back pain has been more
    difficult to control since that time.” (Emphasis added.) In another report
    dated July 26, 2005, Dr. Kline stated:
    The patient was initially seen in the clinic in January
    2005. She underwent an epidural steroid injection. This
    resulted in marked improvement in her ankle, as well as her
    pain. However, she subsequently experienced a fall and
    reinjured her right ankle, as well as her back.
    (Emphasis added.) Thus, although Dr. Kline could not opine within a
    reasonable degree of medical certainty whether Pease’s postaccident
    lower back symptoms were caused by the injury to her right ankle, his
    medical notes are consistent with Dr. Miller’s opinion in this regard.
    The   court       of   appeals    regarded    Dr. Miller’s   expert       opinions
    unreliable because Dr. Miller relied upon a “questionable” history
    provided by Pease. The court noted that the evidence, including video
    surveillance    footage,     directly   contradicted     Pease’s   testimony        and
    undermined her credibility.             As we have stated before, however,
    credibility determinations in workers’ compensation claims are within the
    domain of the commissioner as trier of fact. Certainly, there are cases in
    which witness testimony may be “so impossible or absurd and self-
    13
    contradictory that it should be deemed a nullity by the court,” Graham v.
    Chi. & N.W. Ry., 
    143 Iowa 604
    , 615, 
    119 N.W. 708
    , 711 (1909), but this
    is no such case.
    First, Dr. Miller did not rely solely upon the history provided by
    Pease in his evaluation.        Dr. Miller also performed a physical
    examination of Pease and reviewed medical records detailing Pease’s
    medical history. After performing the physical and reviewing the medical
    records, Dr. Miller—who is a board certified orthopedic surgeon, board
    certified in occupational medicine, and board certified in performing
    independent medical evaluations—concluded within a reasonable degree
    of medical certainty that the injury to Pease’s right ankle aggravated her
    symptoms of pain in her left ankle and lower back.             The District
    presented no expert opinion calling Dr. Miller’s opinions into question
    within a reasonable degree of medical certainty. Thus, even if the video
    surveillance raised doubts about Pease’s credibility, the commissioner
    could nevertheless reasonably rely upon the opinion of Dr. Miller.
    Second, Dr. Miller’s conclusions did not change after he viewed the
    video surveillance footage. Dr. Miller wrote a letter to Pease’s attorney
    following a review of the surveillance videos.    In the letter, Dr. Miller
    stated, “[I]t is my opinion within a reasonable degree of medical certainty,
    that my report with its conclusions and impairment recommendations,
    remains accurate and appropriate.”       Dr. Miller explained Pease will
    experience “good days and bad days regarding her symptoms and activity
    level that can affect her gait pattern and her use of ankle supports and
    braces.” Thus, Dr. Miller’s opinion, which the commissioner called “in-
    depth and substantiated,” was unaffected by the video surveillance
    footage.
    14
    Third, video surveillance footage depicting a claimant performing
    tasks inconsistent with the claimed disability is hardly a smoking gun.
    “Although on the surface it might appear that nothing could be more
    cogent and a more dramatic refutation of a disability claim than motion
    pictures of a claimant jacking up a car or playing tennis,” Professor
    Larson explains, “the courts have rightly observed that such evidence
    must be used with great caution.”      7 Arthur Larson & Lex K. Larson,
    Larson’s Workers’ Compensation Law § 127.10, at 127-46 (2010).            In
    Gagliano v. Boh Brothers Construction Co., 
    44 So. 2d 732
    , 735 (La. Ct.
    App. 1950), the Court of Appeal of Louisiana cautioned the use of motion
    pictures and noted that a “spirit of fair play” requires motion pictures to
    “reflect all activities of the subject of the pictures, and not merely
    snatches or fragments.” Also, in Ferraro v. Zurcher, 
    79 A.2d 473
     (N.J.
    Super. Ct. App. Div. 1951), the Superior Court of New Jersey cautioned
    against the use of heavily edited motion pictures that consolidate isolated
    incidents taken over a span of three years into a fifteen minute film.
    “This presentation of isolated incidents occurring at widely separated
    times,” the Ferraro court explained, “gives the deceptive impression of a
    continuing performance and tends to cause the viewer to infer that
    petitioner has a capacity for sustained effort, which clearly is not the
    fact.” Ferraro, 79 A.2d at 478; see also Lambert v. Wolf’s, Inc., 
    132 So. 2d 522
    , 527 (La. Ct. App. 1961) (admitting motion picture evidence with
    caution because it failed to show rest periods, did not reflect pain, and
    did not show the after effects of the subject’s activities); DeChandt v. N.D.
    Workers Comp. Bureau, 
    452 N.W.2d 82
    , 85 (N.D. 1990) (holding workers’
    compensation bureau’s reliance on audio and videotapes failed to
    adequately explain reasons for disregarding medical evidence).
    15
    In this case, the video surveillance footage is not of such a
    character as to completely undermine Pease’s credibility.        All told, the
    video contains less than forty minutes of Pease walking and shopping
    during the two-year period between her work injury and the hearing.
    The surveillance footage is fragmented, depicting Pease for brief intervals
    of time. Even the longest segment, which lasted less than a half hour, is
    not continuous and is missing nearly five minutes. We acknowledge the
    video does tend to impeach the credibility of Pease as it shows she did
    not always wear her brace and, on at least one occasion, wore sandals.
    It was the duty of the commissioner, however, to weigh the evidence as a
    whole, taking into consideration the credibility of the witnesses, and
    determine whether Pease’s right ankle injury aggravated the symptoms of
    Pease’s left ankle and lower back.        See Burns v. Bd. of Nursing, 
    495 N.W.2d 698
    , 699 (Iowa 1993) (“Because review is not de novo, the court
    must not reassess the weight to be accorded various items of evidence.”).
    Viewing the record as a whole, the commissioner may have reasonably
    concluded the fragmented video surveillance footage did not entirely
    undercut Pease’s credibility or the opinions of Dr. Miller.
    Substantial evidence therefore supports the commissioner’s finding
    of medical causation with respect to Pease’s left ankle and lower back.
    The court of appeals erred in holding otherwise.
    B.      Medical Causation of Pease’s Postaccident Level of
    Depression.      We also conclude substantial evidence supports the
    commissioner’s    finding   that   Pease’s   work   injury    aggravated   her
    depression.    The commissioner and deputy commissioner principally
    relied on the medical opinions of Dr. Stutts. Dr. Stutts concluded Pease
    suffered from Major Depressive Disorder, Recurrent following her work
    accident.   He opined to a reasonable degree of medical certainty that
    16
    Pease’s work injury was “a substantial factor in bringing about her
    current level of depression” and her “chronic pain was more likely than
    not permanent and would continue to contribute to [Pease’s] level of
    depression.” “Situational stress and chronic pain as well as limitations
    from injuries and ongoing litigation,” Dr. Stutts explained, “have
    exacerbated anxiety and worsened mood substantially.”          Further, he
    noted that “[c]hronic pain and depression are intimately linked and serve
    to exacerbate one another” and “the chronic pain in Ms. Pease’s ankles is
    a substantial contributing factor in her depression.”
    Dr. Stutts’ conclusions were consistent with those of Jennifer
    Bradley, an advanced nurse practitioner under the supervision of
    Dr. Stutts.   Following the accident, Pease met with Bradley eight
    separate times between June 13, 2005, and August 30, 2006. Bradley’s
    notes of the initial diagnostic evaluation state, “Since [Pease] had ankle
    surgery, her depression worsened dramatically.”            Based on her
    evaluation of Pease, Bradley’s impression was that Pease suffered Major
    Depressive Disorder, Recurrent and Severe.
    Moreover, Dr. Brownell, Pease’s family doctor, met with Pease on
    May 26, 2005, and his medical notes from the visit state that Pease was
    “[v]ery tearful” and that she felt “down, depressed and sad.” The notes
    also state that Pease’s symptoms of depression “all started after the
    problems with her right ankle.”     Dr. Brownell stated that this was a
    “[p]retty clear case of post-surgical depression.”      Explaining further,
    Dr. Brownell noted,
    I certainly think this is a Workman’s Compensation issue
    and is caused by the surgery of her ankle, and the injury
    itself. I think it’s a combination of both the stress of the
    surgery and also her decreased mobility etc, as a result of
    the actual injury itself.
    17
    Based on his observations and conclusions, Dr. Brownell prescribed
    Pease antidepressant medication and referred her to Dr. Stutts.
    Not all medical professionals agreed with the conclusions of
    Dr. Stutts, Bradley, and Dr. Brownell, however.          Dr. Crowe, a
    psychiatrist with the University of Iowa, evaluated Pease once in
    November 2005. Dr. Crowe summarized his conclusions in a letter to
    EMC Insurance Companies dated December 19, 2005.           In the letter,
    Dr. Crowe stated that he diagnosed Pease with Major Depressive
    Disorder, but concluded that the accident did not aggravate her
    depression because her major depressive disorder began a year before
    the injury (April 2004) and that the current episode did not occur until
    three months after the injury.    Dr. Crowe subsequently changed his
    diagnosis to malingering after viewing the video surveillance footage
    discussed above.   In light of his finding of malingering, Dr. Crowe no
    longer had confidence in his previous diagnosis given what he perceived
    to be the questionable history provided by Pease. Dr. Crowe also stated,
    however, that he could not exclude a diagnosis of depression.
    Dr. Stutts and Bradley rejected Dr. Crowe’s conclusions. “We are
    without a doubt,” they explained in a letter to Pease’s attorney, “in
    agreement that Ms. Pease is not malingering as Dr. Crowe charges.”
    Dr. Stutts and Bradley also noted that malingering occurs in the absence
    of pathology, and because Pease had been diagnosed with Major
    Depressive Disorder, she was not malingering. Accordingly, despite Dr.
    Crowe’s observations, they did not change their diagnosis of Major
    Depressive Disorder, Recurrent, and Dr. Stutts did not alter his
    conclusion that Pease’s work injury aggravated her depression.
    The commissioner was thus confronted with a classic “battle of the
    experts.” On the one hand, an independent psychiatric evaluation found
    18
    Pease to be malingering. On the other hand, Dr. Stutts diagnosed Pease
    with Major Depressive Disorder, Recurrent, and he concluded that the
    work injury aggravated Pease’s depression.     The deputy commissioner
    ultimately found Dr. Stutts’ opinion more credible and explained that
    Dr. Crowe’s revised diagnosis of malingering “was not based on any
    additional treatment of the claimant” and “ignore[d] that the claimant
    ha[d] actual underlying physical pathology and diagnosed recurrent
    major depressive disorder.”   He also rejected Dr. Crowe’s diagnosis of
    malingering because Dr. Crowe’s opinion “demonstrate[d] that [Pease]
    was reasonably stable at the time of injury and worsened following.” The
    commissioner adopted these findings.
    As we have explained, the commissioner, as fact finder, is
    responsible for determining the weight to be given expert testimony.
    Sherman v. Pella Corp., 
    576 N.W.2d 312
    , 321 (Iowa 1998).               The
    commissioner is free to accept or reject an expert’s opinion in whole or in
    part, particularly when relying on a conflicting expert opinion. Id.; see
    Huwe v. Workforce Safety & Ins., 
    746 N.W.2d 158
    , 161–62 (N.D. 2008)
    (“When confronted with a classic ‘battle of the experts,’ a fact-finder may
    rely upon either party’s expert witness.”). The courts, in their appellate
    capacity, “are not at liberty to accept contradictory opinions of other
    experts in order to reject the finding of the commissioner.”       Dille v.
    Plainview Coal Co., 
    217 Iowa 827
    , 846, 
    250 N.W. 607
    , 615 (1933); see
    Hinrichs v. Davenport Locomotive Works, 
    203 Iowa 1395
    , 1397, 
    214 N.W. 585
    , 586 (1927). In this case, the commissioner relied on the opinion of
    Dr. Stutts who concluded Pease’s work injury aggravated her depression.
    Dr. Stutts’ conclusions were supported by the opinions of two other
    medical professionals who met with Pease several times following her
    19
    accident.   Based on the record before us, we are satisfied that the
    commissioner’s findings are supported by substantial evidence.
    The court of appeals, however, concluded that Dr. Stutts’ opinion
    did not amount to substantial evidence because it was based in part on
    the inaccurate and incomplete history of Pease’s depression. Specifically,
    the court of appeals noted that Pease “downplayed the depression she
    experienced prior to her right ankle injury” when providing her history to
    Dr. Stutts. Also, the court stated that Dr. Stutts was “not told of the
    depression and medications taken before the January fall, nor was he
    aware of her reports to Dr. Eyanson on the day before the injury.”
    Before Dr. Stutts rendered his opinion, Pease met with Bradley for
    an initial diagnostic evaluation.   Bradley’s impression was that Pease
    suffered from Major Depressive Disorder, Recurrent.       The diagnostic
    criteria for Major Depressive Disorder, Recurrent includes the presence
    of two or more Major Depressive Episodes.          American Psychiatric
    Association, DSM-IV-TR Mental Disorders: Diagnosis, Etiology, and
    Treatment 738 (Michael B. First & Allan Tasman eds. 2004). According
    to the Diagnostic and Statistical Manual of Mental Disorders-IV, “To be
    considered separate episodes, there must be an interval of at least 2
    consecutive months in which criteria are not met for a Major Depressive
    Episode.”   Id.   Thus, although Bradley noted Pease’s past psychiatric
    history was Pease “took Lexapro for a short time because she felt as
    though she was having some hormonal imbalance,” Bradley’s initial
    impression that Pease had Major Depressive Disorder, Recurrent,
    suggests Bradley was aware that Pease suffered at least one previous
    Major Depressive Episode.
    Even assuming Pease provided inaccurate and incomplete history
    of her depression, Dr. Stutts was provided materials detailing Pease’s
    20
    prior history with depression. Not insignificantly, Dr. Stutts received the
    December 19, 2005 letter in which Dr. Crowe explained Pease had been
    diagnosed with Major Depressive Disorder as early as April 12, 2004.
    Dr. Stutts also received the records of Dr. Fortson from 2004, which
    stated that Pease’s past medical history was “remarkable for anxiety with
    depression.”     Dr. Fortson’s notes also show that Pease was diagnosed
    with anxiety disorder with depression in 2004. Additionally, Dr. Stutts
    was given the records of Dr. Brownell, stating that in April 2004 Pease
    had “[s]ituational depression associated with anxiety.”                  Dr. Brownell’s
    notes     also   list    medications   prescribed        by   him        that   included
    antidepressants.        While Dr. Stutts may not have been apprised of the
    reports made by Dr. Eyanson the day before the injury stating that Pease
    experienced symptoms of depression, Dr. Stutts received materials to
    apprise    him    of    Pease’s   preexisting    level   of   depression        and   the
    medications Pease took before the January fall.                          Therefore, the
    commissioner may have reasonably relied on the conclusions of
    Dr. Stutts in finding Pease’s work injury aggravated her depression.
    In sum, the commissioner’s finding that Pease’s preexisting
    depression was aggravated by her accident on January 26, 2005, is
    supported by substantial evidence.              The commissioner relied on an
    opinion of a psychiatrist who concluded that Pease’s work injury
    aggravated her depression. In addition to the medical history provided
    by Pease, the psychiatrist’s conclusions were made after receiving several
    medical    records      showing    Pease’s    history    with    depression.          The
    conclusions      were    consistent    with     the   opinions      of    two    medical
    professionals who personally evaluated Pease several times following the
    accident. Although another expert offered a contrary opinion, the weight
    to be given conflicting expert opinions is within the province of the
    21
    commissioner. The commissioner’s decision explained why he rejected
    the conflicting opinion and was otherwise sufficiently detailed to show
    the path the agency took through the conflicting evidence.               See
    Terwilliger v. Snap-On Tools Corp., 
    529 N.W.2d 267
    , 274 (Iowa 1995);
    Catalfo v. Firestone Tire & Rubber Co., 
    213 N.W.2d 506
    , 510 (Iowa 1973).
    IV. Remaining Issues.
    On direct appeal, the District raised three additional issues. First,
    the District argued the commissioner failed to perform a de novo review
    of the deputy commissioner’s proposed decision.        Second, the District
    asserted that the commissioner’s decision regarding disability was not
    supported by substantial evidence. Third, the District argued that the
    district court erred in awarding certain medical benefits following Pease’s
    injury. The court of appeals held the commissioner performed a de novo
    review as required.      Also, in light of its conclusion that substantial
    evidence did not support the commissioner’s findings of medical
    causation, the court of appeals did not address the disability argument
    and reversed the award of medical expenses. We discuss each issue in
    turn.
    A. De Novo Review. We agree with the court of appeals that the
    commissioner performed a de novo review of the deputy commissioner’s
    findings. The appeal decision states:
    Upon de novo review, it is apparent that the presiding deputy
    relied most heavily on the opinions of Ray Miller, M.D., and
    Raymond Stutts, D.O., Ph.D., to find that claimants pre-
    existing conditions were substantially and permanently
    aggravated as a result of her injury of January 26, 2005.
    Both Dr. Miller and Dr. Stutts provide in-depth and
    substantiated medical opinions that are consistent with
    claimant’s ability to maintain her employment position prior
    to her fall, but no longer able to maintain her employment
    position following her fall.
    22
    The District argues this passage “reads like substantial evidence review.”
    We disagree. The commissioner expressly stated that he was performing
    a de novo review.     Also, the commissioner adopted in large part the
    deputy commissioner’s proposed decision. Consequently, his discussion
    focused on the reasons he adopted the deputy’s findings and offered
    “additional analysis” explaining why he found the opinions of Dr. Miller
    and Dr. Stutts credible. We therefore conclude the commissioner applied
    the appropriate standard of review in its appeal decision.
    B. Extent of Disability. The commissioner, adopting the deputy
    commissioner’s findings, concluded Pease suffered a permanent and total
    industrial disability. Industrial disability is determined by an evaluation
    of the employee’s earning capacity.        IBP, Inc. v. Al-Gharib, 
    604 N.W.2d 621
    , 632 (Iowa 2000).        The commissioner may consider a number of
    factors   in   determining    industrial    disability,   including   functional
    disability, “age, education, qualifications, experience, and [the claimant’s]
    inability, because of the injury, to engage in employment for which [s]he
    is fitted.” McSpadden v. Big Ben Coal Co., 
    288 N.W.2d 181
    , 192 (Iowa
    1980) (internal quotation marks omitted).
    In finding permanent and total disability, the deputy commissioner
    stated:
    On January 6, 2006 the claimant was discharged by
    the employer because the claimant’s permanent restrictions,
    from her work injury of January 26, 2005, were such that
    the school district determined that “these permanent
    restrictions make you unable to perform the essential
    functions of the position of ‘job coach,’ and unable to
    perform essential functions of any other job in the District in
    your pay range. . . .”
    Due to her physical restrictions, depression and pain
    the claimant is unable to return to any job she has
    previously held.      The Cedar Rapids Community School
    District is a large employer and as such its inability to return
    23
    the claimant to work in any position is highly significant and
    indicative of the claimant’s loss of ability to work in the
    competitive labor market. See Bacon v. Ft. Dodge Animal
    Health, File No. 5001168, (App. February 23, 2007)[.]
    Considering the claimant’s medical impairments, daily pain,
    current training, permanent restrictions, inability of the
    employer to find a[n] alternative position for the claimant, as
    well as all other factors of industrial disability, the claimant
    has suffered a 100 percent loss of earnings capacity.
    After a careful review of the evidence, we conclude substantial
    evidence supports these findings.         Pease offered direct testimony and
    several expert opinions supporting a finding of permanent total disability.
    Although, as the District observes, some evidence in the record suggests
    Pease    is   capable   of   performing    minimal   physical   activity,   the
    commissioner gave more weight to the evidence in support of permanent
    total disability and found Pease’s experts more credible. We, therefore,
    will not disturb the commissioner’s finding that Pease suffers a
    permanent total industrial disability. See Robbennolt v. Snap-On Tools
    Corp., 
    555 N.W.2d 229
    , 234 (Iowa 1996) (“The court must not reassess
    the weight of the evidence because the weight of the evidence remains
    within the agency’s exclusive domain.”).
    The District also argues substantial evidence is lacking in the
    commissioner’s industrial disability determination because Pease’s work
    injury did not prevent her from returning to full-time employment;
    rather, Pease’s preexisting, nonwork related disabilities prevented her
    from doing so. This argument, however, is an attempt to resurrect the
    District’s apportionment claim. In Second Injury Fund of Iowa v. Nelson,
    
    544 N.W.2d 258
    , 264 (Iowa 1995), we summarized our approach to
    apportionment, stating:
    When a prior injury, condition or illness, unrelated to
    employment, independently produces an ascertainable
    portion of an injured employee’s cumulative industrial
    24
    disability, the employer is liable only for that portion of the
    industrial disability attributable to the current injury. In
    other words, the industrial disability is apportioned between
    that caused by the work-related injury and that caused by
    the nonwork-related condition or injury. Varied Enterprises,
    Inc. v. Sumner, 
    353 N.W.2d 407
    , 411 (Iowa 1984). The
    employer is liable only for the work-related portion.
    The commissioner and the district court both concluded that the
    District failed to preserve its apportionment claim. During the hearing
    before the deputy commissioner, the deputy discussed with the parties
    the issues in dispute. The deputy made no mention of apportionment.
    Before proceeding, the deputy asked the District’s attorney whether there
    were any issues in dispute that he did not discuss.             The District’s
    attorney stated, “I do not believe so.         I do not believe that there are
    additional issues that you have not covered.” Further, in his proposed
    decision, the deputy did not address the apportionment claim.             The
    District failed to file a motion for rehearing or a motion to enlarge the
    deputy’s findings.     Under these circumstances, the District failed to
    preserve err on its apportionment claim. See Iowa Admin. Code r. 876—
    4.28(7) (“An issue will not be considered on appeal if the issue could have
    been, but was not, presented to the deputy.”); cf. Freedom Fin. Bank v.
    Estate of Boesen, 
    805 N.W.2d 802
    , 809 (Iowa 2011) (holding err is not
    preserved when the district court does not address an issue and a party
    fails to file a motion to enlarge findings).
    C. Medical Expenses. Finally, the District argues Pease failed to
    show certain medical bills from Cardiologists PC, East Central Iowa
    Acute Care, Famous Footwear, and Dr. Brownell were related to her work
    injury. Specifically, the District asserts Pease failed to establish a causal
    connection between her work injury and medical expenses she incurred
    in July 2006 to address her heart complaints.
    25
    We   agree   with   the   district   court   that   the   commissioner’s
    determination on the issue is supported by substantial evidence. Pease
    testified that she went to the emergency room in 2006 because her “heart
    was beating real fast.” She explained that she met with Dr. Brownell and
    Dr. Brownell advised her to go to the emergency room. Pease testified
    that her heart symptoms were associated with her work injury because
    they related to the anxiety she experienced following the accident.
    Pease’s testimony is supported by medical records submitted at the
    hearing.   Medical records from July 2006 establish that Pease’s
    physicians believed her heart-related symptoms were associated with
    Dr. Stutts’ treatment of her depression. A physician who met with Pease
    on July 12, 2006, “strongly” recommended she follow up with Dr. Stutts
    because he “felt that some of [Pease’s] orthostatic changes may [have
    been] due to her multiple medications.”        Similarly, on July 16, 2006,
    Pease was evaluated for difficulty breathing and chest discomfort. The
    physician’s assessment of Pease stated that Pease suffered “[p]ersistent
    waking tachycardia, likely anxiety reaction.” Pease was again advised to
    make an appointment with Dr. Stutts, who was treating Pease for what
    the commissioner determined were work-related problems.              On these
    facts, we decline to disturb the commissioner’s findings.
    The district court did not address the commissioner’s award of
    medical bills unrelated to Pease’s heart symptoms. The District did not
    file a motion to enlarge or otherwise request the court to address the
    issue. Thus, the District did not preserve err on its argument related to
    the remaining medical bills.        See Stammeyer v. Div. of Narcotics
    Enforcement, 
    721 N.W.2d 541
    , 548 (Iowa 2006).
    26
    V. Conclusion.
    For the reasons discussed above, we conclude the commissioner’s
    findings of fact are supported by substantial evidence. We also conclude
    the commissioner performed the appropriate standard of review of the
    deputy commissioner’s proposed decision and did not err in assessing
    Pease’s heart-related medical bills against the District.   We, therefore,
    vacate the decision of the court of appeals and affirm the judgment of the
    district court.
    DECISION OF COURT OF APPEALS VACATED; DISTRICT
    COURT JUDGMENT AFFIRMED.
    All justices concur except Mansfield, J., who takes no part.