Amy Ann Schutjer Vs. Algona Manor Care Center And Iowa Long Term Care Risk Management Association ( 2010 )


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  •                    IN THE SUPREME COURT OF IOWA
    No. 06–1748
    Filed March 19, 2010
    AMY ANN SCHUTJER,
    Appellant,
    vs.
    ALGONA MANOR CARE CENTER
    and IOWA LONG TERM CARE
    RISK MANAGEMENT ASSOCIATION,
    Appellees.
    On review from the Iowa Court of Appeals.
    Appeal from the Iowa District Court for Kossuth County, Joseph J.
    Straub, Judge.
    Employer seeks further review of court of appeals’ decision in appeal of
    workers’ compensation case.        DECISION OF COURT OF APPEALS
    VACATED IN PART; DISTRICT COURT JUDGMENT AFFIRMED, AND
    CASE REMANDED.
    Mark S. Soldat of Soldat & Parrish-Sams, P.L.C., West Des Moines, for
    appellant.
    Michael L. Mock of Bradshaw, Fowler, Proctor & Fairgrave, P.C.,
    Des Moines, for appellees.
    2
    TERNUS, Chief Justice.
    This workers’ compensation case comes to us on further review from
    the court of appeals.   The appellee, Algona Manor Care Center, does not
    dispute that the appellant, Amy Schutjer, sustained an injury to her lower
    back on December 2, 2002, that arose out of and in the course of her
    employment with Algona Manor.         In fact, Algona Manor paid Schutjer
    temporary benefits. The parties do, however, disagree with respect to the
    following matters: (1) the correct rate for benefits, (2) Schutjer’s entitlement
    to additional temporary total and temporary partial disability benefits, (3)
    Schutjer’s entitlement to permanent partial disability benefits, and (4) the
    propriety of penalty benefits.    The workers’ compensation commissioner
    sided with Algona Manor on these issues, agreeing with Algona Manor’s
    calculation of the rate and awarding no additional benefits.
    On Schutjer’s appeal to the district court, the court determined the
    employer had incorrectly calculated the rate, and the commissioner had
    improperly refused to award temporary benefits for certain days between
    December 2, 2002, and January 4, 2003.         The district court affirmed the
    commissioner’s decision with respect to a denial of temporary benefits after
    January 4, 2003, finding substantial evidence to support the commissioner’s
    determination that Schutjer voluntarily quit her employment on January 5.
    The district court also affirmed the commissioner’s refusal to award
    permanent partial disability benefits. Finally, the court concluded that, in
    view of the court’s reversal as to the correct rate, the commissioner should
    reconsider whether penalty benefits should be imposed.
    Both parties appealed, and the case was transferred to the court of
    appeals.   That court affirmed the district court with respect to the proper
    rate and the need for reconsideration of penalty benefits. As for temporary
    benefits, the court of appeals agreed with the district court that Schutjer was
    3
    entitled to temporary benefits for certain days between December 2, 2002,
    and January 4, 2003. The court of appeals disagreed with the district court
    on two issues. The court of appeals concluded that the commissioner had
    not properly analyzed the question of Schutjer’s entitlement to temporary
    benefits after she left employment on January 5, and that the commissioner
    had failed to provide adequate detail in his decision to support his
    conclusion that Schutjer had no permanent disability. Therefore, the court
    of appeals reversed the denial of temporary benefits after January 5, 2003,
    and the denial of permanent partial disability benefits.
    Algona Manor sought further review.             We granted further review to
    consider whether the commissioner properly determined Schutjer was not
    entitled to temporary benefits after January 4, 2003, and whether the
    commissioner adequately detailed his reasons for finding Schutjer had not
    sustained a permanent disability. See Anderson v. State, 
    692 N.W.2d 360
    ,
    363 (Iowa 2005) (“On further review, we can review any or all of the issues
    raised on appeal or limit our review to just those issues brought to our
    attention by the application for further review.”). 1            We find no basis for
    reversal with respect to either matter. Therefore, we vacate that part of the
    court of appeals’ decision reversing the district court on these two issues.
    We affirm the district court’s decision and remand the case to the district
    court for further proceedings.
    I. Factual and Procedural Background.
    We limit our recitation of the evidence and history of this case to those
    facts and rulings that are pertinent to the two issues we have chosen to
    address on further review.
    1On   all other issues raised on appeal, the court of appeals’ decision stands as the
    final ruling. See Everly v. Knoxville Cmty. Sch. Dist., 
    774 N.W.2d 488
    , 492 (Iowa 2009).
    4
    A. Injury and Medical Treatment.          At the time of her injury on
    December 2, 2002, Amy Schutjer worked as a certified nursing assistant
    (CNA) at Algona Manor Care Center. On that date, she and another CNA
    were transferring a resident from the resident’s bed to a wheelchair. During
    this maneuver, Schutjer experienced a sharp pain in her left hip area that
    radiated into her back and down her left leg.
    Algona Manor immediately sent Schutjer to the Kossuth Regional
    Health Center where Schutjer saw a physician’s assistant.             Schutjer
    described what had happened and denied any history of prior back
    problems,   even   though   her   medical   and   employment    records   from
    approximately 1991 onward indicate numerous complaints of back pain,
    including a back injury in 1991 as a result of being thrown from a horse. X-
    rays of the lumbrosacral spine and left hip taken at the health center were
    essentially normal.    Due to her continued complaints of severe pain,
    Schutjer was administered a pain medication injection and given a
    prescription for pain medication.      She was also taken off work until
    December 9, 2002.
    On December 9, 2002, Schutjer returned to the health center for a
    scheduled appointment with Dr. Burt Bottjen.           Schutjer reported to
    Dr. Bottjen that the pain medication had not helped much. After observing
    and examining the patient, Dr. Bottjen concluded her complaints were
    exaggerated and inconsistent with the reported injury.      He increased her
    pain medication and advised her to work with her workers’ compensation
    carrier to find another physician, as he would not be able to help her.
    The employer authorized care with Dr. Kevin Culbert. Dr. Culbert first
    saw Schutjer on December 12, 2002.          In relaying her medical history,
    Schutjer again denied any history of back problems. She also provided a
    somewhat different version of the incident that precipitated her current pain,
    5
    stating that during the transfer the resident slipped, jerking Schutjer’s back
    forward in a flexed position. Dr. Culbert diagnosed Schutjer with acute low
    back pain with left sciatica. He prescribed medication, continued physical
    therapy, and ordered modified work duties to include no lifting over ten
    pounds, no bending or twisting, no stooping or crouching, and no pushing or
    pulling.
    The employer constructed and provided Schutjer’s supervisors with a
    list of light-duty activities that would be appropriate for Schutjer to perform
    within her restrictions. Schutjer returned to work on December 17, 2002.
    On December 27, 2002, Schutjer underwent an MRI that showed
    bulging at L4–5, but no significant encroachment on the spinal canal. Due
    to Schutjer’s continuing pain, Dr. Culbert maintained duty restrictions,
    continued her pain medication, and ordered a consult with anesthesiology
    for pain management.
    On January 2, 2003, Schutjer received a lumbar epidural steroid
    injection. That same day, she notified Dr. Culbert that she was not getting
    much help at work to stay within restrictions and had to do some bending,
    twisting, and pulling. Dr. Culbert advised Schutjer to speak to the charge
    nurse or head of human resources about this.
    On January 5, 2003, Schutjer reported to work, but a few hours after
    the shift started, Schutjer and the charge nurse got into a dispute when the
    nurse requested that Schutjer clean commode buckets, bedpans, and
    urinals. Schutjer advised the nurse that she could not bend down to clean
    commodes.    According to the charge nurse, when she instructed Schutjer
    that Schutjer could still clean the urinals, Schutjer became angry, swung
    her arms around, stating “I’m leaving, I quit,” and stormed out the door.
    The following day, the nursing supervisor informed the workers’
    compensation claims adjuster that Schutjer had terminated her employment
    6
    with Algona Manor.      The claims adjuster informed the supervisor that
    Schutjer had called the carrier and left a message about the incident in
    which she claimed she was being asked to do tasks she could not do. The
    supervisor denied this was the case.
    That same day, Schutjer called the supervisor to ask, “What’s going
    on?”   Schutjer denied she had quit the night before, claiming the charge
    nurse had asked her to leave. The supervisor countered, however, that it
    was her understanding the charge nurse had asked Schutjer to leave only
    after Schutjer had twice refused to follow the charge nurse’s request to clean
    urinals.    Upon reconfirmation of the facts with the charge nurse, the
    supervisor advised Schutjer that Algona Manor was accepting her “I quit” as
    her termination. Schutjer did not return to Algona Manor to work after this
    incident.
    Schutjer continued to see Dr. Culbert for her low back pain. Having
    been advised by Schutjer that she had obtained no relief with the epidural
    injection, Dr. Culbert referred her to Dr. Palit, an orthopedic surgeon.
    On January 22, 2003, Dr. Palit saw Schutjer for the first time. After
    examining her and reviewing the prior MRI, Dr. Palit’s diagnosis was “mild
    lumbar degenerative disc disease” for which he ordered physical therapy and
    allowed light-duty work with a twenty-pound lifting restriction and no
    bending, twisting, kneeling, or crawling. However, like Dr. Bottjen, Dr. Palit
    found “[t]he patient’s pain complaints and manifestation . . . out of
    proportion to her physical and radiographic findings.” He was also surprised
    by her report that, the night before, she had experienced an acute onset of
    total paralysis from the waist down that lasted about an hour. His surprise
    focused on the fact that Schutjer did not seek medical care because “[s]he
    knew [she] was going to see [me] the next morning.”            Dr. Palit found
    7
    Schutjer’s attitude about this alleged incident to be “very cavalier” “for this
    apparently devastating experience of total paralysis.”
    On February 28, 2003, Schutjer returned to see Dr. Palit for ongoing
    low back pain with bilateral lower extremity pain. Schutjer reported that she
    had not gone to physical therapy at this point. She had, however, obtained
    employment in the Hy-Vee floral department and, according to Dr. Palit,
    reported working up to twelve hours per day. (At the subsequent workers’
    compensation hearing, Schutjer claimed she only worked a maximum of six
    hours per shift at Hy-Vee.) After examination, Dr. Palit determined Schutjer
    had reached maximum medical improvement as of February 28, 2003. He
    released her to regular duty and directed her to continue taking her anti-
    inflammatory medication.
    Between February 19, 2003, and March 26, 2003, Schutjer also
    sought care for her back pain with Jensen Chiropractic. On her last three
    visits for manipulation, March 17, 19, and 26, 2003, Schutjer reported no
    complaints.   At the subsequent workers’ compensation hearing, however,
    Schutjer testified that only her continued treatment with Dr. Jensen made
    work at the floral department bearable.      On March 27, 2003, the claims
    adjuster for the workers’ compensation carrier advised Schutjer that her
    chiropractic treatment was not authorized and that she either needed to
    return to Dr. Palit or needed to request alternative medical treatment.
    Schutjer did not request alternative care.
    On April 3, 2003, Schutjer sought treatment from Dr. Arthur
    Doenecke for her continuing and long-standing problems with anxiety and
    depression.   Dr. Doenecke ordered Prozac for depression and Ambien for
    sleep and made a psychiatric referral.       He also referred Schutjer to a
    podiatrist for two ingrown toenails she had asked him to examine. There
    was no mention in the medical notes that Schutjer reported any continuing
    8
    back, hip, or leg problems. Two later doctor visits on April 15 and May 8,
    2003, make no reference to any complaints of continuing back, hip, or leg
    problems.     Schutjer also continued her employment with Hy-Vee until
    April 28, 2003, when she quit because she needed to be involved in seeking
    a loan for a new home.
    At the subsequent workers’ compensation hearing, Schutjer testified
    that she did not seek medical attention for her back and continued to work
    even though the pain still existed because her husband would not allow her
    to seek medical attention through his insurance.          The testimony of
    Schutjer’s husband corroborated this assertion.
    Schutjer’s next medical treatment for back pain occurred on June 4,
    2003, when she saw Dr. David Taylor. At that time, she complained of some
    numbness in her left leg with pain sometimes radiating down to her left foot.
    Schutjer reported to Dr. Taylor that this problem started with the
    December 2, 2002 incident at Algona Manor. She also reported to Dr. Taylor
    that her prior MRI showed a bulging disc. Due to her pain and symptomatic
    examination, Dr. Taylor determined it was necessary to rule out a herniated
    disc and ordered another MRI and a consultation with a neurosurgeon,
    Dr. Beck.   He did not place Schutjer on any pain medication due to her
    concerns about chronic use of narcotics.       Several days later, however,
    Schutjer called complaining of continued pain with no relief and was
    restarted on Darvocet N, which she had at home.
    Schutjer’s neurosurgery consultation with Dr. Beck occurred on
    June 16, 2003.    Dr. Beck found the patient to be quite histrionic upon
    physical examination. He read the December MRI as showing a little disc
    degeneration and minimal bulge at L4–5 and told Schutjer this. Because she
    claimed her pain was much worse, however, he agreed to proceed with a
    second MRI.
    9
    The second MRI, performed on June 18, 2003, was essentially the
    same as the first. Nonetheless, because Schutjer continued to complain of
    severe bilateral leg and back pain, Dr. Beck concluded a discogram was
    warranted to determine if L4–5 was a symptomatic disc.           That test,
    performed on June 26, 2003, revealed a tear in the annulus posteriorly at
    L4–5 and some degeneration at L5–S1. Based upon these positive findings,
    Dr. Beck recommended Schutjer undergo spinal fusion at the level of L4–5.
    Schutjer underwent the procedure on July 10, 2003.
    Although her initial post-op period was uneventful, Schutjer was
    subsequently hospitalized for three days for back and right leg pain in late
    August 2003. The pain started two weeks prior after she heard a pop in her
    back.
    In a follow-up visit on September 27, 2003, Dr. Beck found that
    Schutjer continued to have back pain that severely restricted her activity.
    He recommended she continue on significant restrictions of minimum
    sitting, standing, and a twenty-pound weight limit.      X-rays showed an
    excellent fusion, however, and on examination the patient was neurologically
    intact. In December, upon inquiry, Dr. Beck opined Schutjer had suffered a
    twelve percent body-as-a-whole impairment.
    Dr. Palit, upon the same inquiry, opined that Schutjer reached
    maximum medical improvement on February 28, 2003, and that she did not
    require any further medical care other than taking nonsteroidal anti-
    inflammatory medication.     He also opined that the July surgery was not
    medically necessary based on his evaluation earlier in 2003 and that the
    surgery was not causally related to her work injury.
    As a result of the two conflicting medical expert opinions, Schutjer
    requested an independent medical examination. On August 23, 2004, this
    examination was completed by Dr. John Kuhnlein, an occupational and
    10
    environmental specialist.   Dr. Kuhnlein also concluded Schutjer exhibited
    histrionic behavior. In response to the question of whether, to a reasonable
    degree of osteopathic certainty, it was probable that cumulative work
    activities at Algona Manor, the December 2, 2002 incident, or both,
    constituted a substantial, but not necessarily exclusive, factor in causing
    injury to Schutjer’s back and leg, Dr. Kuhnlein opined:
    If one discounts her histrionic behaviors and focuses on the
    objective complaints, it appears that the sensory complaints
    from December of 2002 were mirrored in June and July of 2003
    indicating the same source. However, she had a period of
    several months where she was apparently pain free. She relates
    that she was taking pain medications, but in review of the only
    notes I have available from the medical clinic, she was placed on
    Prozac for depression, and I do not see any specific indication
    she was on pain medications until June of 2003.
    My sense is that physiologically the two are related, but based
    on the currently available medical record, and given Worker’s
    Compensation scenario, I cannot objectively make the
    relationship between the December 2002 injury and the June
    2003 pain, given the several month interval where no back pain
    is mentioned.
    B. Workers’ Compensation Proceeding and Judicial Review.                  On
    September 4, 2003, Schutjer filed a workers’ compensation claim against
    Algona     Manor    and   Cannon    Cochran      Management        Services,   Inc.,
    administrator for Algona Manor’s workers’ compensation carrier, Iowa Long
    Term Care Risk Management Association.          (Our subsequent references to
    Algona Manor include its carrier, where indicated by the context.) A hearing
    on   the   matter   was   held   before    a   deputy   workers’    compensation
    commissioner, Helenjean M. Walleser (hereinafter “deputy”).           Pertinent to
    this appeal, the parties disputed, among other issues, (1) whether the
    December 2, 2002 injury was a cause of permanent disability and, if so, to
    what extent, and (2) whether Schutjer was entitled to healing period
    compensation or temporary partial benefits after she left employment on
    January 5, 2003.
    11
    On March 10, 2005, the deputy filed an arbitration decision, finding
    (1) the December 2, 2002 work injury was not a cause of permanent
    disability, and (2) Schutjer was not entitled to any healing period or
    temporary partial benefits beyond those for which Algona Manor had already
    paid.    The deputy’s credibility findings were critical to her rulings.   She
    specifically found that Schutjer lacked credibility. Supporting this finding
    was the evidence admitted at the hearing.       Admitted into evidence at the
    hearing were the medical records showing prior complaints of back pain that
    Schutjer had denied having when she first sought treatment for her
    December 2, 2002 injury; the testimony of Schutjer admitting that she had
    made those prior complaints; the testimony of Schutjer’s husband that he
    did not believe that Schutjer suffered from back pain after the workers’
    compensation payments stopped, although he had later changed his mind;
    the testimony of Schutjer admitting that she testified at her deposition that,
    after leaving work with Algona Manor, she had not filed an unemployment
    claim that had been denied, although she admitted at the hearing that she
    had done so; and the testimony of Schutjer that she had committed the
    felony of theft by check. In addition, as discussed above, many of the expert
    medical opinions concluded that Schutjer was histrionic in her description of
    pain, more than one physician finding those complaints to be exaggerated.
    Schutjer filed an application for rehearing asserting several errors in
    the deputy’s findings of fact and conclusions of law.      Of relevance to the
    issues we consider, Schutjer contended the deputy erred when the deputy
    held “[t]he greater weight of the credible evidence would establish that
    claimant voluntarily quit her employment on January 5, 2003.”         Instead,
    Schutjer asserted, the greater weight of the evidence established a
    withdrawal of an offer of suitable work or a failure to prove an intentional
    refusal to work. After her application for rehearing was rejected, Schutjer
    12
    appealed to the workers’ compensation commissioner, who delegated
    authority to issue the final agency decision to a different deputy
    commissioner, Larry P. Walshire (hereinafter “commissioner”), who adopted
    the deputy’s proposed decision as the final agency decision. 2                      The
    commissioner specifically noted that he was relying on the credibility
    findings made by the deputy.
    Schutjer filed a petition for judicial review, alleging several errors,
    including the commissioner’s failure to award temporary benefits after
    January 4, 2003, and failure to award medical expenses and permanent
    partial disability benefits after February 28, 2003.
    The district court concluded there was substantial evidence to support
    the commissioner’s finding that Schutjer did in fact terminate—quit—her
    employment with Algona Manor on January 5, 2003. As a result, the court
    held the commissioner properly decided Schutjer was not entitled to
    compensation for either healing period or temporary disability benefits after
    that date. The district court also concluded there was substantial evidence
    to support the commissioner’s finding that Schutjer sustained no permanent
    disability as a result of the December 2, 2002 incident at Algona Manor.
    Therefore, the court affirmed the denial of healing period benefits and
    medical expenses for the time period of July through September 2003, as
    well as the denial of permanent partial disability benefits.
    C. Arguments on Appeal.            Schutjer appealed, and Algona Manor
    cross-appealed.      Only the matters raised by Schutjer on appeal are
    implicated in the issues we address on further review.                 Those matters
    include (1) Schutjer’s contention the district court erred in affirming the
    2Because  the commissioner adopted the deputy’s proposed decision, we will treat
    both the deputy’s proposed decision and the commissioner’s final decision as one decision
    and reference them in the remainder of this opinion as the “commissioner’s decision.”
    13
    commissioner’s failure to award healing period or temporary disability
    benefits after January 4, 2003, on the basis that she had voluntarily quit;
    and   (2)   her   contention   the   district    court   erred   in   affirming   the
    commissioner’s failure to award temporary disability and medical benefits
    associated with her July 10, 2003 surgery and refusal to award permanent
    partial disability compensation.
    D. Court of Appeals’ Decision.            We transferred this appeal to the
    court of appeals. The court of appeals disagreed with the commissioner and
    the district court regarding the effect of Schutjer’s voluntary quit.             The
    appellate court concluded that Schutjer’s voluntary quit was irrelevant to the
    issue of whether she was entitled to temporary benefits.               It held that,
    pursuant to Iowa Code section 85.33(3) (2003), a two-part analysis was
    necessary: (1) Was Schutjer offered suitable work within her restrictions?
    and (2) If so, did she refuse it? This issue, the court concluded, required
    remand to the agency for a determination as to whether, on January 5,
    2003, suitable work within Schutjer’s restrictions was offered to Schutjer
    and whether she refused such work.
    The court of appeals also disagreed with the district court’s affirmance
    of the commissioner’s denial of benefits after February 28, 2003. The court
    of appeals found the commissioner based his causation ruling solely on its
    determination that Schutjer lacked credibility.            The court of appeals
    concluded the agency had a duty to state the evidence relied upon and that
    the commissioner’s decision must be sufficiently detailed to show the path
    taken through the conflicting expert evidence. Because the court of appeals
    thought the commissioner’s decision did not meet these requirements, the
    court of appeals remanded the case, directing the agency to “show the path”
    taken through the conflicting medical evidence and to discuss the relevant
    benefits and expenses.
    14
    Algona Manor filed an application for further review of all of the
    rulings of the court of appeals that were adverse to it.        Schutjer filed a
    resistance to that application. As noted above, we granted further review to
    consider two issues: (1) whether the commissioner properly ruled Schutjer
    was not entitled to temporary benefits after she left employment on
    January 5, 2003; and (2) whether the commissioner adequately explained
    his   decision   that   Schutjer’s   medical   expenses   and   disability   after
    February 28, 2003, were not causally connected to her December 2, 2002
    injury.
    II. Scope of Review.
    Our review in a workers’ compensation action is governed by Iowa
    Code chapter 17A.         See Iowa Code § 86.26 (2009).           Because the
    commissioner’s factual determinations are “ ‘ “clearly vested by a provision of
    law in the discretion of the agency,” ’ . . . we defer to the commissioner’s
    factual determinations if they are based on ‘substantial evidence in the
    record before the court when that record is viewed as a whole.’ ” Larson Mfg.
    Co. v. Thorson, 
    763 N.W.2d 842
    , 850 (Iowa 2009) (quoting Mycogen Seeds v.
    Sands, 
    686 N.W.2d 457
    , 465 (Iowa 2004) and Iowa Code § 17A.19(10)(f)).
    Our assessment of the evidence focuses not on whether the evidence would
    support a different finding than the finding made by the commissioner, but
    whether the evidence supports the findings actually made.         Meyer v. IBP,
    Inc., 
    710 N.W.2d 213
    , 218 (Iowa 2006).          “Because the commissioner is
    charged with weighing the evidence, we liberally and broadly construe the
    findings to uphold his decision.” Finch v. Schneider Specialized Carriers, Inc.,
    
    700 N.W.2d 328
    , 331 (Iowa 2005). In addition, we give due regard to the
    commissioner’s discretion to accept or reject testimony based on his
    assessment of witness credibility.     See Terwilliger v. Snap-On Tools Corp.,
    
    529 N.W.2d 267
    , 273 (Iowa 1995).
    15
    In contrast, the commissioner’s interpretation of the law is entitled to
    no deference because “ ‘[t]he interpretation of the workers’ compensation
    statutes and related case law has not been clearly vested by a provision of
    law in the discretion of the agency.’ ” Lakeside Casino v. Blue, 
    743 N.W.2d 169
    , 173 (Iowa 2007) (quoting 
    Finch, 700 N.W.2d at 330
    ). We will reverse
    the commissioner’s application of the law to the facts “only if the
    commissioner’s application [is] ‘irrational, illogical or wholly unjustifiable.’ ”
    Larson Mfg. 
    Co., 763 N.W.2d at 850
    (quoting Iowa Code § 17A.19(10)(l)).
    III. Temporary Benefits After Voluntary Quit.
    Relying on Iowa Code section 85.33(3), the commissioner ruled
    Schutjer was barred from receiving benefits as of January 5, 2003, the date
    that Algona Manor claims she voluntarily quit her employment. In pertinent
    part, this statute provides:
    If an employee is temporarily, partially disabled and the
    employer for whom the employee was working at the time of
    injury offers to the employee suitable work consistent with the
    employee’s disability the employee shall accept the suitable
    work, and be compensated with temporary partial benefits. If
    the employee refuses to accept the suitable work with the same
    employer, the employee shall not be compensated with
    temporary partial, temporary total, or healing period benefits
    during the period of the refusal.
    Iowa Code § 85.33(3).
    In this case, the commissioner made the following factual finding:
    “The employer was accommodating claimant’s modified duty restrictions
    during [the time after the December 2, 2002 incident.]”         In addition, the
    commissioner stated the evidence established that Schutjer voluntarily quit
    her employment on January 5, 2003. There is no other discussion in the
    findings of fact or conclusions of law regarding the incident on January 5,
    2003.
    16
    In reviewing the commissioner’s decision, the district court held “ ‘the
    greater weight of the objective credible evidence’ indicated [Schutjer] resigned
    her CNA position with Algona Care on January 5, 2003.” The district court
    then went on to discuss the facts found in the record that supported the
    commissioner’s finding on this issue.      It noted the factual discrepancies
    between the parties with respect to what occurred on January 5. Schutjer
    asserted she was asked to perform tasks not within her restrictions and
    denied the allegation by the charge nurse at Algona Manor that she––
    Schutjer––stormed out of the facility after announcing she had quit.         At
    another point in her testimony, however, Schutjer stated: “That isn’t why I
    quit,” an assertion that seems to confirm the nurse’s statement that Schutjer
    quit. In contrast to Schutjer’s testimony, Algona Manor witnesses testified
    Schutjer was excused from performing tasks not within her restrictions—
    such as cleaning bedpans and commode buckets—and that she was only
    required to clean urinals, a task within her restrictions.
    The district court correctly noted that, when there are two competing
    accounts of a single event, the commissioner has the responsibility to weigh
    the evidence and consider the credibility of the witnesses. See 
    Terwilliger, 529 N.W.2d at 273
    . The court concluded substantial evidence supported the
    finding made by the commissioner.
    The court of appeals, however, stated the issue was not whether
    Schutjer voluntarily quit, but whether Schutjer was offered suitable work
    within her restrictions and whether she refused it. Only if she was offered
    such work and refused it would she be precluded from receiving temporary
    partial, temporary total, or healing period benefits. Concluding the agency
    failed to clearly address this issue, the court of appeals remanded the case
    so the commissioner could make this determination.
    17
    We agree the correct test is (1) whether the employee was offered
    suitable work, (2) which the employee refused.        If so, benefits cannot be
    awarded, as provided in section 85.33(3). We conclude, however, that the
    commissioner found Schutjer was offered suitable work that she refused,
    and for that reason, Schutjer was not entitled to benefits as specified under
    section 85.33(3). Although the commissioner’s decision is nearly devoid of
    any discussion of the issue of modified duty and adherence to work
    restrictions, he expressly found that the employer was accommodating
    Schutjer’s modified duty restrictions during this time. Substantial evidence
    supported this conclusion.        The commissioner’s finding that Schutjer
    voluntarily quit satisfied the second requirement of section 85.33(3)––refusal
    of suitable work.
    Schutjer argues, nonetheless, that any refusal of suitable work ended
    on January 6, 2003, when she talked to the supervisor and denied that she
    had quit, asserting the charge nurse had fired her. This factual dispute––
    whether Schutjer quit or was fired––was resolved against her.        Therefore,
    Algona Manor was justified in accepting Schutjer’s voluntary quit on
    January 5, 2003, as a rejection of suitable work on that date and any future
    date.
    We conclude the findings required by section 85.33(3) were made by
    the commissioner, and these findings enjoy substantial support in the
    record.    Therefore, we vacate the court of appeals’ contrary decision and
    affirm the decision of the district court on this issue.
    IV. Benefits After Maximum Medical Improvement.
    As noted earlier, the court of appeals reversed the district court
    decision affirming the commissioner’s determination that Schutjer was not
    entitled to benefits after February 28, 2003, the date Dr. Palit concluded she
    had reached maximum medical improvement.             To be entitled to benefits
    18
    following this date, Schutjer had to satisfy her burden of proving that her
    medical treatment subsequent to February 28, as well as any temporary or
    permanent disability, was causally related to the December 2, 2002 injury.
    Schutjer argues the commissioner’s finding that her medical problems
    after February 28, 2003, were not causally related to her December 2002
    injury is not supported by substantial evidence.           She contends the
    commissioner failed to explain the basis for his rejection of the evidence
    supporting a causal connection, particularly the testimony of Dr. Beck. The
    court of appeals concluded the district court erred in holding that the
    commissioner found “the opinions of Dr. Palit and Dr. Kuhnlein, along with
    the testimony of [Schutjer], to support the finding that [Schutjer’s]
    continuing back problems were not caused by the December 2, 2002
    incident at Algona Manor.” The court of appeals believed the agency based
    its causation ruling solely on its determination that Schutjer lacked
    credibility and that the agency failed to explain the weight given to the varied
    medical opinions or explain how it resolved the conflicts in the medical
    evidence.
    1. Applicable legal principles.      “A claimant must prove by a
    preponderance of the evidence that the injury is a proximate cause of the
    claimed disability.” Grundmeyer v. Weyerhaeuser Co., 
    649 N.W.2d 744
    , 752
    (Iowa 2002).    Ordinarily, expert testimony is necessary to establish the
    causal connection between the injury and the disability for which benefits
    are claimed. 
    Id. With regard
    to expert testimony,
    “[t]he commissioner must consider [such] testimony together
    with all other evidence introduced bearing on the causal
    connection between the injury and the disability.         The
    commissioner, as the fact finder, determines the weight to be
    given to any expert testimony. Such weight depends on the
    accuracy of the facts relied upon by the expert and other
    surrounding circumstances. The commissioner may accept or
    reject the expert opinion in whole or in part.”
    19
    
    Id. (quoting Sherman
    v. Pella Corp., 
    576 N.W.2d 312
    , 321 (Iowa 1998)
    (citations omitted)); accord Sanchez v. Blue Bird Midwest, 
    554 N.W.2d 283
    ,
    285 (Iowa Ct. App. 1996) (“Expert opinion testimony, even if uncontroverted,
    may be accepted or rejected in whole or in part by the trier of fact.”).
    With respect to the commissioner’s written decision, Iowa Code section
    17A.16(1) provides: “The [agency] decision shall include an explanation of
    why the relevant evidence in the record supports each material finding of
    fact. . . . Each conclusion of law shall be supported by cited authority or by
    a reasoned opinion.” This duty on the part of the agency is intended to allow
    a reviewing court “to ascertain effectively whether or not the presiding officer
    actually did seriously consider the evidence contrary to a finding, and
    exactly why that officer deemed the contrary evidence insufficient to
    overcome the evidence in the record supporting that finding.”          Arthur E.
    Bonfield, Amendments to Iowa Administrative Procedure Act, Report on
    Selected Provisions to Iowa State Bar Association and Iowa State Government
    42 rptr. cmt. (1998) [hereinafter “Bonfield”]; accord Catalfo v. Firestone Tire &
    Rubber Co., 
    213 N.W.2d 506
    , 510 (Iowa 1973) (“[The commissioner’s]
    decision must be sufficiently detailed to show the path he has taken through
    conflicting evidence.    When he disregards uncontroverted expert medical
    evidence he must say why he has done so.”); see also Tussing v. George A.
    Hormel & Co., 
    417 N.W.2d 457
    , 458 (Iowa 1988) (finding commissioner’s
    failure to state any reasons for rejecting overwhelming evidence, including
    medical evidence, that work-related injury occurred on date in question
    required reversal).     The requirement that the commissioner explain his
    decision is not intended to be onerous:
    [T]he commissioner’s decision must be “sufficiently detailed to
    show the path he has taken through conflicting evidence,” [but]
    the law does not require the commissioner to discuss each and
    every fact in the record and explain why or why not he has
    20
    rejected it. Such a requirement would be unnecessary and
    burdensome.
    
    Terwilliger, 529 N.W.2d at 274
    (quoting 
    Catalfo, 213 N.W.2d at 510
    ); accord
    Bonfield at 42 rptr. cmt. (stating the “requirement of a brief explanation will
    not be burdensome”); see also Bridgestone/Firestone v. Accordino, 
    561 N.W.2d 60
    , 62 (Iowa 1997) (stating commissioner’s duty to furnish a
    reasoned opinion is satisfied if “ ‘it is possible to work backward . . . and to
    deduce what must have been [the agency’s] legal conclusions and [its]
    findings of fact’ ” (quoting Norland v. Iowa Dep’t of Job Serv., 
    412 N.W.2d 904
    , 909 (Iowa 1987))).
    2. Analysis. The commissioner’s opinion does not express the step-
    by-step reasoning process that led him to the conclusion that Schutjer failed
    to show the December 2002 injury caused continued disability after
    February 28, 2003.    Nevertheless, we conclude on this specific issue—the
    connection between the December 2, 2002 injury and the subsequent
    treatments after February 28, 2003, and resulting impairment—it is possible
    to determine from the commissioner’s opinion what evidence he considered
    and why he credited some of this evidence over other, conflicting evidence.
    As noted by the court of appeals, the agency did summarize the
    medical opinions contained in the evidence.       The commissioner observed
    that Dr. Palit stated Schutjer had reached maximum medical improvement
    on February 28, 2003, and Dr. Palit found no permanent impairment. The
    commissioner noted that Dr. Palit further opined that, based upon his
    evaluation of Schutjer in January and February 2003, Schutjer’s surgery
    was not causally related to her work injury and was not medically necessary.
    On the other hand, the commissioner mentioned that Dr. Beck, who initially
    saw Schutjer in June 2003 and eventually performed a laminectomy on her,
    opined Schutjer’s December 2, 2002 injury was a substantial factor in
    21
    causing her back pain and that under the guidelines she had a twelve
    percent whole body impairment as a result of that injury.       Finally, the
    commissioner discussed the opinion of the independent medical expert,
    Dr. Kuhnlein. Dr. Kuhnlein, as noted previously, opined that he could not
    objectively relate Schutjer’s December 2, 2002 injury to her June 2003 back
    pain as Schutjer did not have a “straight record” of symptoms from her
    December injury to her July surgery. The commissioner also took note of
    Dr. Kuhnlein’s observation that, while Schutjer maintained she had
    remained on nonsteroidal anti-inflammatory medication after her release
    from Dr. Palit, the medical records did not support this.    In addition to
    reviewing these medical opinions, the commissioner summarized the various
    medical providers from whom Schutjer sought care during the period
    between February 28, 2003, and June of 2003, specifically finding that she
    did not mention any back or leg symptoms to her primary care physician or
    her psychiatrist when she saw them on five separate occasions in April and
    May 2003.
    At the end of his review of the medical evidence, the commissioner
    stated the following conclusion:
    Claimant does not carry her burden of demonstrating that
    her December 2, 2002 work injury was a substantial factor in
    precipitating her June 2003 complaints, her July 2003 surgery,
    and her continuing low back and bilateral leg symptoms. The
    record clearly demonstrates that claimant has never been averse
    to seeking medical care. It also clearly demonstrates that
    claimant tends to complain profusely to her care providers about
    any medical conditions for which she is seeking care. Given
    those circumstances, claimant’s statements, both to medical
    providers from June 4, 2003 onward and at hearing, that she
    had continuing low back and leg symptoms from December 2,
    2002 lack credibility.
    (Emphasis added.) It is apparent from the commissioner’s discussion that
    he believed Schutjer would have complained of back and leg pain between
    22
    February 2003 and June 2003 if she had continued to experience such pain
    during that time. The commissioner had previously noted, however, that the
    record did not indicate such complaints had been made. Accordingly, the
    commissioner concluded Schutjer’s assertions of continuing symptoms
    between February and June lacked credibility. This conclusion confirmed
    Dr. Kuhnlein’s opinion that, in the absence of a “straight record” of
    symptoms from the December 2002 injury to the July 2003 surgery, it could
    not be said that the December 2002 injury was causally linked to the later
    surgery and permanent impairment.
    Thus, when the commissioner’s conclusion that Schutjer’s testimony
    of continuing symptoms was not credible is considered in the context of the
    commissioner’s review of the medical evidence, it is evident that the
    commissioner chose to rely on the opinions of Dr. Palit and Dr. Kuhnlein
    because those opinions were more consistent with the factual findings made
    by the commissioner with respect to the symptoms Schutjer experienced
    between February and June.          Thus, it is possible to identify from the
    commissioner’s causation discussion the evidentiary basis of his conclusion
    and why he gave preference to the opinion testimony of Dr. Palit and
    Dr. Kuhnlein.
    We   conclude,   therefore,   that    the   commissioner’s   decision   was
    sufficiently detailed to permit us to ascertain that he seriously considered
    the evidence for and against his finding with respect to causation, as well as
    why he concluded the evidence against causation was more credible.             In
    addition, the commissioner’s decision on causation is supported by
    substantial evidence in the form of the expert opinions of Dr. Palit and
    Dr. Kuhnlein. Therefore, we vacate the decision of the court of appeals and
    affirm the decision of the district court affirming the commissioner’s ruling
    23
    that Schutjer was not entitled to benefits for the medical expenses and
    disability she sustained after February 28, 2003.
    V. Summary and Disposition.
    We conclude the commissioner found Schutjer was offered suitable
    work, which she refused, and these findings are supported by substantial
    evidence.   Therefore, the commissioner did not err in refusing to award
    Schujter temporary benefits after she left employment. We also conclude the
    commissioner adequately explained the basis for his decision that the
    medical expenses and disability sustained by Schutjer after she reached
    maximum medical improvement on February 28, 2003, were not causally
    connected to her December 2, 2002 injury.       Because the commissioner’s
    finding on causation is supported by substantial evidence, we affirm the
    commissioner’s decision that Schutjer is not entitled to medical benefits or
    disability benefits for the period subsequent to February 28, 2003.
    DECISION OF COURT OF APPEALS VACATED IN PART; DISTRICT
    COURT JUDGMENT AFFIRMED, AND CASE REMANDED.
    All justices concur except Baker, J., who takes no part.