Roberts Dairy and Crawford & Company v. Grady Billick , 861 N.W.2d 814 ( 2015 )


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  •                IN THE SUPREME COURT OF IOWA
    No. 13–1009
    Filed April 3, 2015
    ROBERTS DAIRY and CRAWFORD & COMPANY,
    Appellees,
    vs.
    GRADY BILLICK,
    Appellant.
    Appeal   from      the   Iowa    District   Court   for   Polk   County,
    Christopher L. McDonald, Judge.
    A workers’ compensation claimant appeals the district court’s
    ruling on judicial review of a decision of the Iowa Workers’ Compensation
    Commissioner. REVERSED AND REMANDED WITH INSTRUCTIONS.
    Thomas J. Currie of Currie & Liabo Law Firm, P.L.C., Cedar
    Rapids, for appellant.
    Stephen W. Spencer and Joseph M. Barron of Peddicord, Wharton,
    Spencer, Hook, Barron & Wegman, L.L.P., West Des Moines, for
    appellees.
    2
    HECHT, Justice.
    An employee sought workers’ compensation benefits for a series of
    work-related injuries.    His current employer contends its liability for
    industrial disability benefits must be apportioned because the employee
    previously suffered disability as a consequence of two separate injuries
    sustained while working for other employers. The workers’ compensation
    commissioner concluded apportionment of industrial disability is not
    mandated by law under the circumstances of this case.            On judicial
    review, the district court concluded the commissioner’s decision was
    based    on   a   misinterpretation   of   amendments   to   our    workers’
    compensation statutes passed in 2004. The district court reversed the
    commissioner’s decision and remanded the case to the agency for further
    findings relevant to the apportionment issue.     Finding no error in the
    commissioner’s interpretation of the relevant statutes, we reverse the
    district court’s ruling and remand with instructions.
    I. Background Facts and Proceedings.
    The following facts are supported by substantial evidence in the
    agency record for this case. In 1985, Grady Billick sustained a back
    injury while working for Squealer Feed Company in Iowa.            He later
    settled his workers’ compensation claim against that company for
    payment based on an eighty-five percent industrial disability.
    In 1993, Billick was again injured while working for Milky Way
    Transport. On that occasion, he lost control of a tanker truck he was
    driving in inclement weather. The truck crashed and Billick sustained
    injuries to his head, neck, left shoulder, ribs, back, and left arm. His
    workers’ compensation claim for these injuries was settled under
    Missouri law for an amount representing 18.5% permanent partial
    disability of the body as a whole.
    3
    Billick began working for Roberts Dairy (Roberts) in 2001.       The
    employment required Billick to drive a semi-truck and deliver milk
    products from Iowa City to various retail stores across the state.     The
    trucks were generally loaded by others, but Billick was required to
    unload them himself upon arrival at points of delivery.
    Billick suffered four work-related injuries while working for
    Roberts. In March 2004, a dolly carrying milk crates struck Billick’s left
    ankle and trapped it against a dock plate. Despite treatment, including
    an arthroscopic surgery, Billick was left with permanent impairment and
    experiences residual pain and swelling in his left lower extremity.
    In June 2004, shelving in a Wal-Mart store collapsed while Billick
    was making a delivery there for Roberts. The shelving struck Billick’s
    head, neck, and left shoulder, and knocked him to the ground. He
    received treatment for left shoulder and neck pain which led to shoulder
    surgery. Billick was assigned a partial permanent physical impairment
    rating for this injury.
    In 2006, rusty bolts on a trailer strap came loose when Billick used
    the strap while pulling a truck door shut. He lost his balance, fell out of
    the truck, and injured his left arm and elbow. An MRI study performed
    on the day of this injury revealed a thoracic compression fracture.
    Billick lost no work as a consequence of this injury.
    In 2007, a misaligned loading dock at a store in Altoona caused
    several milk crates to fall off a dolly.   The crates struck Billick in the
    chest and shoulder. While driving back to Iowa City after sustaining this
    injury in Altoona, another vehicle’s erratic movement caused Billick to
    steer his truck off the road. The emotional trauma resulting from the
    near-crash combined with and superimposed on the chest injury he
    4
    suffered earlier that day made Billick quite distraught and produced a
    physical–mental injury.
    Billick filed four workers’ compensation petitions against Roberts.
    The claims were consolidated for hearing.               The commissioner’s appeal
    decision awarded Billick healing period benefits for various periods of
    temporary total disability, permanent partial disability benefits for a loss
    of twelve percent of his left lower extremity, and permanent partial
    disability benefits for the loss of thirty-five percent of his earning capacity
    for the unscheduled components of injury.
    The commissioner rejected Roberts’s contention that its liability for
    Billick’s industrial disability should be apportioned because Billick was
    previously compensated for his losses of earning capacity arising from
    the 1985 and 1993 injuries through settlements in Iowa with Squealer
    Feed and with Milky Way in Missouri.               Both parties sought judicial
    review of the commissioner’s appeal decision.
    Although the parties’ petitions for judicial review challenged—and
    the district court’s decision addressed—numerous aspects of the agency
    decision,   the   only   issue   before       us   on    appeal   is   whether   the
    commissioner’s ruling on the apportionment issue based upon his
    interpretation of the legislature’s 2004 amendments to Iowa Code
    chapter 85 was correct. The district court concluded the commissioner
    misapprehended the relevant statutes and therefore reversed and
    remanded the case to the agency for further findings of fact relevant to
    the apportionment issue.
    Billick appeals from the district court’s decision on judicial review.
    We retained the appeal to interpret the 2004 amendments and decide
    whether the commissioner erred in concluding Roberts’s liability for
    5
    permanent partial disability benefits cannot be apportioned under the
    circumstances of this case.
    II. Scope of Review.
    “Iowa Code chapter 17A governs judicial review of the decisions of
    the workers’ compensation commissioner.” Mycogen Seeds v. Sands, 
    686 N.W.2d 457
    , 463 (Iowa 2004).             Under chapter 17A, we are free to
    substitute our own interpretation of statutes “whose interpretation[s]
    ha[ve] not clearly been vested” in the agency. Iowa Code § 17A.19(10)(c)
    (2007); see also Mycogen Seeds, 
    686 N.W.2d at 464
    .                 To determine
    whether the legislature clearly vested an agency with authority to
    interpret particular statutes, we consider “the phrases or statutory
    provisions to be interpreted, their context, the purpose of the statute,
    and other practical considerations . . . as well as the functions of and
    duties imposed on the agency.” Renda v. Iowa Civil Rights Comm’n, 
    784 N.W.2d 8
    , 11–12 (Iowa 2010).
    The legislature has not expressly granted the commissioner the
    power to interpret Iowa Code sections 85.34(2)(u) and (7)(a)—the statutes
    at issue in this case. It has “granted to the commissioner the authority
    to ‘[a]dopt and enforce rules necessary to implement’ chapters 85, 85A,
    85B, 86 and 87.”       Waldinger Corp. v. Mettler, 
    817 N.W.2d 1
    , 5 (Iowa
    2012) (alteration in original) (quoting 
    Iowa Code § 86.8
    (1)(a) (2011)).
    However, standing alone this does “not constitute a clear vesting of
    interpretive authority.”     
    Id. at 7
    .   Sections 85.34(2)(u) and (7)(a) leave
    undefined several terms and phrases bearing on this case, such as
    “earning   capacity”   and     “preexisting   disability.”   See    
    Iowa Code §§ 85.34
    (2)(u), (7)(a) (2007).     The presence of undefined terms and
    phrases in these sections suggests the legislature did not clearly vest the
    6
    agency with authority to interpret those terms and phrases.                   See
    Waldinger Corp., 817 N.W.2d at 7.
    We conclude the legislature did not clearly vest the commissioner
    with authority to interpret the subsections of Iowa Code section 85.34 at
    issue in this case.       “Accordingly, our review of the commissioner’s
    interpretation . . . is for correction of errors at law.” Id.
    III. The Parties’ Positions.
    Billick   asserts    the   district   court   erred    in   reversing   the
    commissioner’s determination that Roberts is not, as a matter of law,
    entitled to apportionment under the circumstances presented here. He
    contends the commissioner correctly concluded the 2004 amendments to
    Iowa Code section 85.34 did not modify the fresh-start rule for an
    industrial disability claim made by a claimant who was previously
    compensated for a loss of earning capacity suffered as a consequence of
    an unscheduled injury that occurred while working in the course and
    scope of employment for a different employer.               Billick contends an
    interpretation of section 85.34 allowing Roberts a credit for any disability
    compensated by previous employers would inflict upon him an
    unwarranted reduction in benefits not intended by the legislature when it
    amended the Iowa Workers’ Compensation Act in 2004. Further, Billick
    suggests the district court’s interpretation of the 2004 amendments
    circumvents the fundamental purpose and intent of Iowa Code chapter
    85—which is to benefit injured workers and their dependents.                  See
    McSpadden v. Big Ben Coal Co., 
    288 N.W.2d 181
    , 188 (Iowa 1980).
    Conversely, Roberts asserts the commissioner’s interpretation of
    the 2004 amendments contravenes the legislature’s clearly stated
    purpose underlying the enactments and would allow Billick a double
    recovery for his consecutive losses of earning capacity. See 
    2004 Iowa
                                      7
    Acts 1st Extraordinary Sess. ch. 1001, § 20.           Roberts contends the
    legislature’s 2004 amendments were intended to abrogate the concept of
    full responsibility by specifically indicating employers will not be held
    responsible for disability sustained through a prior work injury. Roberts
    further contends the commissioner erred in denying it credit for 425
    weeks of permanent partial disability benefits paid by Billick’s prior
    employers.    Accordingly, Roberts requests that we affirm the district
    court’s ruling remanding this case to the commissioner for new findings
    on the extent of Billick’s loss of earning capacity.
    IV. Analysis.
    A. Law Antedating the 2004 Amendments. The resolution of the
    issue presented for our decision turns on the legal effect of the
    legislature’s 2004 amendments to Iowa Code section 85.34. Because the
    legislature expressly intended the amendments to “modif[y] the fresh
    start and full responsibility rules of law announced by the Iowa
    [S]upreme [C]ourt in a series of judicial precedents,” 2004 Iowa Acts 1st
    Extraordinary Sess. ch. 1001, § 20, our analysis begins with an overview
    of those rules as they had been previously applied.
    1. The fresh-start rule.      The fresh-start rule is a theoretical
    construct presuming that when an employee who has sustained a work-
    related injury resulting in permanent partial industrial disability begins
    employment with a new employer, the employee enjoys a renewed
    earning capacity. A preeminent workers’ compensation treatise explains
    the reasoning behind this rule:
    The capacities of a human being cannot be arbitrarily
    and finally divided and written off by percentages. The fact
    that a person has once received compensation . . . for 50
    percent of total disability does not mean that ever after he or
    she is in the eyes of compensation law but half a person,
    never again entitled to receive a compensation award going
    8
    beyond the other 50 percent of total. After having received
    the prior payments, he or she may, in future years, be able
    to resume gainful employment. . . . If so, there is no reason
    why a disability which would bring anyone else total
    permanent disability benefits should yield that person only
    half as much.
    8 Arthur Larson & Lex K. Larson, Larson’s Workers’ Compensation Law §
    92.02[7][c], at 92-10 (rev. ed. 2014); see also Ziegler v. U.S. Gypsum Co.,
    
    252 Iowa 613
    , 620, 
    106 N.W.2d 591
    , 595 (1960) (“It is . . . well settled
    that when an employee is hired, the employer takes him subject to any
    active     or   dormant    health   impairments    incurred   prior   to   this
    employment.”).      Under the fresh-start rule, if the employee sustains a
    new work-related injury after commencing work for a new employer, any
    resulting loss of earning capacity is measured as a diminution of the
    new, complete earning capacity that existed at the time the employment
    with the new employer commenced.
    2. The full-responsibility rule.   The full-responsibility rule is a
    functional corollary of the fresh-start rule.     Floyd v. Quaker Oats, 
    646 N.W.2d 105
    , 110 (Iowa 2002) (noting our decision in Celotex Corp. v.
    Auten, 
    541 N.W.2d 252
     (Iowa 1995), “was a recognition . . . that
    application of the full-responsibility rule in body-as-a-whole disability
    situations is based on the premise of a fresh start with respect to
    industrial disability” (emphasis added)). “When there are two successive
    work-related [unscheduled] injuries, the employer liable for the second
    injury ‘is generally held liable for the entire disability resulting from the
    combination of the prior disability and the present injury.’ ”         Second
    Injury Fund v. Nelson, 
    544 N.W.2d 258
    , 265 (Iowa 1995) (quoting Celotex
    Corp., 
    541 N.W.2d at 254
    ).
    3. Venegas v. IBP.    The practical consequence of the employee’s
    fresh start and the successor employer’s full responsibility in the context
    9
    of successive unscheduled injuries before the 2004 amendments was
    illustrated by our decision in Venegas v. IBP, Inc., 
    638 N.W.2d 699
     (Iowa
    2002). In Venegas, the claimant sustained a back injury that caused a
    thirty-five percent permanent partial industrial disability while working
    for an employer in California. 
    Id. at 700
    . Years later, while working for a
    different employer in Iowa, the claimant sustained another back injury
    resulting in a fifty-five percent industrial disability. See 
    id.
     at 700–01.
    The commissioner apportioned the award of industrial disability benefits
    for the latter injury and ordered the second employer to pay benefits
    representing an award of twenty percent disability.              
    Id.
     1   However, on
    judicial   review,   the    district   court   concluded      apportionment       was
    unwarranted “and that IBP was responsible for the total amount of
    [Venegas’s] industrial disability.”      
    Id. at 701
    .     We agreed and held the
    full-responsibility rule should apply due to the fresh start Venegas
    gained when he began work in Iowa for a new employer. See 
    id.
     at 701–
    02.
    B. The 2004 Amendments to Section 85.34.                          In a special
    session of the general assembly held in 2004, two amendments to section
    85.34 were adopted.        The first of these was an amendment to section
    85.34(2)(u), which provided as follows:
    1Prior  to the 2004 amendments, we noted the full-responsibility rule could also
    apply where a claimant sustained successive injuries resulting in permanent disability
    while working for a single employer. Excel Corp. v. Smithart, 
    654 N.W.2d 891
    , 898 (Iowa
    2002). Notwithstanding, we concluded apportionment was necessary in Smithart
    because the claimant was receiving workers’ compensation weekly benefits for a prior
    work-related injury when the new injury occurred. 
    Id. at 899
    . Under Iowa Code section
    85.36(9)(c) (2001), apportionment was mandated because the benefits owed to Smithart
    for the two injuries overlapped. See Smithart, 
    654 N.W.2d at
    899–900. The legislature
    repealed section 85.36(9)(c) in 2004. 2004 Iowa Acts 1st Extraordinary Sess. ch. 1001,
    § 12.
    10
    u. In all cases of permanent partial disability other
    than those hereinabove described or referred to in
    paragraphs “a” through “t” hereof, the compensation shall be
    paid during the number of weeks in relation to five hundred
    weeks as the reduction in the employee’s earning capacity
    caused by the disability bears in relation to the body of the
    injured earning capacity that the employee as a whole
    possessed when the injury occurred.
    2004 Iowa Acts 1st Extraordinary Sess. ch. 1001, § 10. 2             The second
    significant aspect of the amendments was the addition of a new section
    numbered 85.34(7). It provides, in relevant part, as follows:
    7. SUCCESSIVE DISABILITIES.
    a. An employer is fully liable for compensating all of
    an employee’s disability that arises out of and in the course
    of the employee’s employment with the employer. An
    employer is not liable for compensating an employee’s
    preexisting disability that arose out of and in the course of
    employment with a different employer or from causes
    unrelated to employment.
    b. If an injured employee has a preexisting disability
    that was caused by a prior injury arising out of and in the
    course of employment with the same employer, and the
    preexisting disability was compensable under the same
    paragraph of section 85.34, subsection 2, as the employee’s
    present injury, the employer is liable for the combined
    disability that is caused by the injuries, measured in relation
    to the employee’s condition immediately prior to the first
    injury. In this instance, the employer’s liability for the
    combined disability shall be considered to be already
    partially satisfied to the extent of the percentage of disability
    for which the employee was previously compensated by the
    employer.
    If, however, an employer is liable to an employee for a
    combined disability that is payable under section 85.34,
    subsection 2, paragraph “u”, and the employee has a
    preexisting disability that causes the employee’s earnings to
    be less at the time of the present injury than if the prior
    injury had not occurred, the employer’s liability for the
    combined disability shall be considered to be already
    partially satisfied to the extent of the percentage of disability
    2In our reproduction of this amendment, underlining indicates additions and
    strikethrough indicates deletions.
    11
    for which the employee was previously compensated by the
    employer minus the percentage that the employee’s earnings
    are less at the time of the present injury than if the prior
    injury had not occurred.
    c. A successor employer shall be considered to be the
    same employer if the employee became part of the successor
    employer’s workforce through a merger, purchase, or other
    transaction that assumes the employee into the successor
    employer’s workforce without substantially changing the
    nature of the employee’s employment.
    Id. § 11.
    The legislation included a statement of the general assembly’s
    legislative intent in adopting these amendments to section 85.34.      In
    relevant part, the statement explained the statutory changes would
    “prevent all double recoveries and all double reductions in workers’
    compensation benefits for permanent partial disability.” Id. § 20. The
    statement of legislative intent further clarified that the amendments to
    section 85.34 “modifie[d] the fresh start and full responsibility rules of
    law announced by the Iowa [S]upreme [C]ourt in a series of judicial
    precedents.”     Id.   Yet, the statement notably revealed the general
    assembly did not intend to eliminate the fresh-start rule altogether. It
    instead recognized the continuing vitality of the fresh-start rule as
    modified by the amendments:
    The competitive labor market determines the value of a
    person’s earning capacity through a strong correlation with
    the level of earnings a person can achieve in the competitive
    labor market. The market reevaluates a person as a working
    unit each time the person competes in the competitive labor
    market, causing a fresh start with each change of
    employment.
    Id. The statement emphasized in clear terms that the general assembly
    intended no change of existing law “that is not expressly provided” in the
    enactment. Id.
    12
    C. Effect   of   the   2004   Amendments.        The commissioner
    concluded the amended section 85.34 did not alter the fresh-start rule in
    cases involving successive injuries resulting in industrial disability
    sustained in the course of employment with different employers. Noting
    new section 85.34(7)(b) established a formula for apportioning disability
    only for successive work-related injuries sustained while working for the
    same employer, the commissioner determined Roberts’s liability for
    permanent partial disability benefits in this case cannot be apportioned
    to account for any disability Billick sustained as a result of his injuries
    sustained in 1985 and 1993 while working for other employers.
    The district court rejected the commissioner’s interpretation
    limiting apportionment to instances of successive injuries sustained
    while working for the same employer. The court acknowledged that the
    2004 amendments did not completely abrogate the fresh-start rule,
    noting that “[e]ach and every time a worker enters the competitive labor
    market and obtains a new wage—whether higher or lower than the prior
    wage—the worker . . . necessarily establishes a new baseline earning
    capacity.” However, the court concluded the commissioner’s formulation
    of the modified fresh-start rule erroneously exposed Roberts to liability—
    in violation of section 85.34(7)(a)—for disability arising from injuries
    sustained by Billick in 1985 and 1993 while working for different
    employers. See 
    Iowa Code § 85.34
    (7)(a) (“An employer is not liable for
    compensating an employee’s preexisting disability that arose out of and
    in the course of employment with a different employer . . . .”).       The
    commissioner’s failure to order apportionment, the court concluded,
    exposed Roberts to liability for Billick’s double recovery of permanent
    partial disability benefits—an outcome the general assembly sought to
    avoid. See 2004 Iowa Acts 1st Extraordinary Sess. ch. 1001, § 20.
    13
    The district court concluded the new section 85.34(7)(a)—when
    read in conjunction with the amendment of section 85.34(2)(u) 3—
    unambiguously abrogated the full-responsibility rule and extended the
    rule of apportionment to successive work-related injuries with different
    employers. Concluding the commissioner’s industrial disability decision
    did not reveal whether it apportioned Roberts’s liability for Billick’s loss
    of earning capacity, the court remanded to the commissioner for findings
    on Billick’s earning capacity before and after the injuries sustained while
    working for Roberts.
    Our review of the discordant readings of the 2004 amendments
    begins with the proposition that we presume “the legislature is familiar
    with the holdings of this court relative to legislative enactments.” Mallory
    v. Paradise, 
    173 N.W.2d 264
    , 266 (Iowa 1969); see also State v. Jones,
    
    298 N.W.2d 296
    , 298 (Iowa 1980) (“The legislature is presumed to know
    the state of the law, including case law, at the time it enacts a statute.”).
    We have often indicated we presume the legislature was aware of our
    decisions when it crafted new statutes.             See, e.g., Simbro v. Delong’s
    Sportswear, 
    332 N.W.2d 886
    , 889 (Iowa 1983) (“We assume that at the
    time the legislature amended [section 85.34(2)(s)] it was familiar with the
    existing case law that evaluated scheduled disability on a functional
    basis.”); Beier Glass Co. v. Brundige, 
    329 N.W.2d 280
    , 285 (Iowa 1983)
    (presuming the legislature was aware of our cases interpreting the word
    “benefits” and the term “weekly compensation”). Thus, we presume the
    general assembly knew the preexisting law pertaining to the fresh-start
    3Section 85.34(2)(u) bases compensation for permanent partial disability for
    unscheduled injuries “caused by [work-related] disability” on diminution of “the earning
    capacity . . . the employee possessed when the injury occurred.”             
    Iowa Code § 85.34
    (2)(u).
    14
    and full-responsibility rules developed in Nelson, Celotex Corp., and
    Venegas when it drafted and passed the 2004 amendments.                           This
    presumption is most appropriate here because the statement of intent
    accompanying the 2004 amendments expressly observed the enactment
    was intended to modify the fresh-start and full-responsibility rules
    announced in this court’s decisions.                  See 2004 Iowa Acts 1st
    Extraordinary Sess. ch. 1001, § 20.
    At the time the 2004 amendments were adopted, the law applied
    the fresh-start and full-responsibility rules to claims for permanent
    partial unscheduled disability arising from successive work-related
    injuries whether the injuries were sustained while working for the same
    employer or for different employers. Venegas, 
    638 N.W.2d 699
    , 701-02
    (successive injuries with different employers); Celotex Corp., 
    541 N.W.2d at 252, 256
     (successive injuries with same employer).             Thus, the general
    assembly was aware liability for successive work-related injuries was not
    generally apportioned. 4 It is undisputed that the legislature intended to
    modify the rules with the 2004 amendments. See 2004 Iowa Acts 1st
    Extraordinary Sess. ch. 1001, § 20.             The fighting question presented
    here, however, is the extent to which the amendments modified the
    preexisting rules as they had developed and were applied in our case law.
    Upon review, we conclude the commissioner’s reading of section
    85.34 as amended is correct.            We do not believe the amendment is
    without ambiguity. One of the new sections reads, “An employer is not
    liable for compensating an employee’s preexisting disability that arose
    out of and in the course of employment with a different employer . . . .”
    4Apportionment     was permitted, however, for ascertainable portions of
    permanent partial disability causally related to preexisting nonwork-related injuries or
    conditions prior to the 2004 amendments. See Nelson, 544 N.W.2d at 264.
    15
    
    Iowa Code § 85.34
    (7)(a). This might suggest that when an employee is
    determined to have suffered a work-related industrial disability, any
    resulting award of disability should be offset to account for any previous
    work-related industrial disability sustained in the course and scope of
    employment with, and compensated by, a previous employer. However,
    the section does not expressly say that, and even more importantly, Iowa
    Code section 85.34 provides no mechanism for apportioning the loss
    between the present and previous employers. This is in direct contrast to
    Iowa Code section 85.34(7)(b), which explains exactly how the offset is to
    be calculated when an employee suffers successive injuries while
    working for the same employer.     If the legislature wanted to require a
    credit or offset of disability benefits in cases of successive unscheduled
    injuries with different employers, it logically would have prescribed how
    it should be determined.
    We also give considerable weight to the general assembly’s
    statement of purpose when it adopted the 2004 amendments. See 
    Iowa Code § 4.6
    (7) (stating that we may rely on the legislature’s “preamble or
    statement of policy” in interpreting an ambiguous statute); Taft v. Iowa
    Dist. Ct., 
    828 N.W.2d 309
    , 317 (Iowa 2013).     In this case, the general
    assembly’s statement of purpose was unmistakably clear.               The
    legislature recognized that market forces “reevaluate[] a person as a
    working unit each time the person competes in the competitive labor
    market, causing a fresh start with each change of employment.” 2004
    Iowa Acts 1st Extraordinary Sess. ch. 1001, § 20. We conclude therefore
    the general assembly unmistakably reaffirmed the vitality of the fresh-
    start rule in cases involving successive injuries in the course and scope
    of employment with different employers.      With each fresh start, the
    employee’s earning capacity is reset. If a percentage of that refreshed
    16
    earning capacity is subsequently lost as a consequence of a permanent
    partial unscheduled injury, compensation for that percentage is owed.
    The measure of such compensation is based on “the number of weeks in
    relation to five hundred weeks as the reduction in the employee’s earning
    capacity caused by the disability bears in relation to the earning capacity
    that the employee possessed when the injury occurred.” 
    Iowa Code § 85.34
    (2)(u). When a successive injury is sustained in the course and
    scope of employment with a different employer, the earning capacity
    possessed by the employee when the injury occurred is an earning
    capacity refreshed by market forces when the new employment began.
    The notion underlying the 2004 amendments that a refreshed
    earning capacity is established upon commencement of new employment
    is based in part on the proposition that earning capacity is not static.
    Physical    and   mental   injuries   sometimes   heal   over    time,    and
    rehabilitation sometimes restores functional capacity, at least in part.
    See Bearce v. FMC Corp., 
    465 N.W.2d 531
    , 536 (Iowa 1991) (finding the
    claimant gained a fresh start because after a prior injury he rehabilitated
    and improved his physical condition).       Further, postinjury education
    sometimes     substantially   enhances     earning    capacity    prior    to
    commencement of new employment.            Thus, the changing nature of
    factors affecting a claimant’s postinjury earning capacity in the
    competitive labor market is an essential feature of the rationale for the
    modified fresh-start rule. See Excel Corp. v. Smithart, 
    654 N.W.2d 891
    ,
    898 (Iowa 2002) (“[A]n industrial disability is not a final indicator of the
    degree to which a worker can use his or her body to earn wages, and it
    does not consider the human capacity and spirit to overcome a disability
    through rehabilitation, adjustments, simple perseverance, or other
    methods.”).
    17
    We respectfully disagree with the district court’s conclusion that
    the commissioner’s interpretation of the amendments—preserving the
    fresh-start rule in cases of successive unscheduled injuries with different
    employers—cannot be squared with the clear language of section
    85.34(7)(a), which provides that “[a]n employer is not liable for
    compensating an employee’s preexisting disability that arose out of and
    in the course of employment with a different employer . . . .” 
    Iowa Code § 85.34
    (7)(a). Under the modified fresh-start rule, the new employer is
    not liable for disability arising out of unscheduled injuries sustained
    during past employment with a former employer.                 The new employer’s
    liability under section 85.34(2)(u) for permanent partial disability caused
    by a successive injury is measured by comparing the claimant’s earning
    capacity “when the injury occurred” with “the reduction in earning
    capacity caused by the disability.”            
    Id.
     § 85.34(2)(u).       The earning
    capacity when the injury occurred is a refreshed capacity provided by the
    fresh-start rule. When, as a consequence of a successive work-related
    injury, part of that refreshed earning capacity is lost, compensation is
    owed under section 85.34(2)(u). See id. In this context, the fresh-start
    rule holds the employer liable for a work-related permanent partial loss
    of the new earning capacity refreshed by market forces and existing at
    the time of the successive injury—not for a preexisting disability arising
    from employment with a different employer. 5               Thus, we conclude the
    commissioner did not err in determining the causal connection
    requirement in section 85.34(2)(u) can be harmonized with the language
    5Under   this reading of section 85.34(7)(a), the subsection might be viewed as
    unnecessary, since it restates what the law would be anyway. See 
    Iowa Code § 4.4
    (2)
    (setting forth the presumption that “[t]he entire statute is intended to be effective”).
    However, for the reasons we have already explained, we think this reading is much
    more logical and persuasive than the district court’s reading of the 2004 amendments.
    18
    in section 85.34(7)(a) protecting employers from liability for disability
    arising from employment with a different employer.
    The    district   court   also        concluded   the   commissioner’s
    understanding of section 85.34—as amended by the 2004 enactment—
    violated the general assembly’s purpose of preventing double recoveries
    for successive work-related injuries.       We again disagree.   As we have
    explained, the 2004 amendments preserve the fresh-start rule for an
    employee sustaining successive injuries resulting in permanent partial
    disability in the course of employment with different employers. Under
    the rule, the injured employee recovers for a permanent partial loss of a
    fully refreshed earning capacity redefined by market forces at the time
    new employment began—not for an additional loss of whatever earning
    capacity may have been extant prior to commencement of the new
    employment. In this sense, the employee’s recovery for a successive loss
    of earning capacity sustained in the employment with a new employer is
    not a double recovery for a prior loss. It is instead a full recovery of that
    which has been lost as a consequence of the successive injury: a
    percentage of the refreshed earning capacity.
    Under the interpretation of section 85.34 advanced by Roberts,
    Billick’s recovery in this case would be reduced pro tanto, in an amount
    equal to 425 weeks of compensation he received for the 1985 and 1993
    injuries sustained while working for former employers.        We reject that
    interpretation because it is inconsistent with the fresh-start rule and
    because it assumes earning capacity is static—an assumption we have
    rejected above.    Moreover, the pro-tanto-reduction approach Roberts
    advocates would not credit increases in earning capacity resulting from
    restoration of physical capacity, education, training, or work experience
    achieved prior to commencement of new employment with a different
    19
    employer and a successive injury. Indeed, if section 85.34(7)(a) required
    apportionment for successive unscheduled permanent partial disabilities
    sustained while working for different employers, no employee could ever
    actually gain a fresh start. The legislature intended to modify the fresh-
    start rule, not eliminate it. 2004 Iowa Acts 1st Extraordinary Sess. ch.
    1001, § 20.
    “We determine legislative intent from the words chosen by the
    legislature, not what it should or might have said.”    Auen v. Alcoholic
    Beverages Div., 
    679 N.W.2d 586
    , 590 (Iowa 2004).           If the general
    assembly had intended to eliminate the fresh-start rule and require
    apportionment of successive injuries producing permanent partial
    disability in the course and scope of employment with different
    employers, we think it would have said so.     See Hook v. Trevino, 
    839 N.W.2d 434
    , 443–44 (Iowa 2013) (“If the legislature had intended
    volunteer immunity to apply to the state, it presumably would have said
    so expressly, as it did for the emergency response immunity in the
    Municipal Tort Claims Act.”); Iowa Med. Soc’y v. Iowa Bd. of Nursing, 
    831 N.W.2d 826
    , 841 (Iowa 2013) (“If the legislature had intended to give
    another agency or organization the power to determine recognition by the
    medical profession, it would have said so . . . .”).   Instead, the 2004
    amendments to section 85.34 prescribed a formula for apportioning only
    disability arising from successive injuries in the course and scope of
    employment with the same employer.        Notably, the general assembly
    disavowed any intent to change chapter 85 except as expressly provided
    in the amendments. 2004 Iowa Acts 1st Extraordinary Sess. ch. 1001,
    § 20.    Accordingly, we conclude the commissioner correctly rejected
    Roberts’s apportionment claim in this case.
    20
    V. Conclusion.
    The commissioner correctly concluded the legislature’s 2004
    amendments did not modify the fresh-start rule for claimants sustaining
    successive work-related unscheduled injuries with different employers.
    Because Billick gained a fresh start when he began his employment with
    Roberts in 2001, Roberts is not entitled to apportion its liability for
    permanent partial disability benefits in this case.   The district court’s
    contrary interpretation of section 85.34 was erroneous. Accordingly, we
    reverse the district court’s ruling and remand the case to the district
    court with instructions to affirm the commissioner’s appeal decision.
    REVERSED AND REMANDED WITH INSTRUCTIONS.