Howard Univ. Hosp. v. Dist. of Columbia Dep't of Emp't Servs. , 200 A.3d 1244 ( 2019 )


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    DISTRICT OF COLUMBIA COURT OF APPEALS
    No. 17-AA-832
    HOWARD UNIVERSITY HOSPITAL, PETITIONER,
    v.
    DISTRICT OF COLUMBIA DEPARTMENT OF EMPLOYMENT SERVICES, RESPONDENT,
    and
    JAMES M. LYLES, JR., INTERVENOR.
    On Petition for Review of an Order of the
    District of Columbia Department of Employment Services
    Compensation Review Board
    (CRB-36-17)
    (Argued September 25, 2018                                  Decided January 31, 2019)
    William H. Schladt for petitioner.
    Karl A. Racine, Attorney General for the District of Columbia, Todd S. Kim,
    Solicitor General at the time the statement was filed, and Loren L. AliKhan, Deputy
    Solicitor General at the time the statement was filed, filed a statement in lieu of brief.
    David J. Kapson, with whom Kevin H. Stillman was on the brief, for
    intervenor.
    Before THOMPSON and MCLEESE, Associate Judges, and PRYOR, Senior
    Judge.
    2
    MCLEESE, Associate Judge: Petitioner Howard University Hospital (HUH)
    challenges an award of workers’ compensation to intervenor James M. Lyles, Jr. We
    vacate and remand for further proceedings.
    I.
    Mr. Lyles worked for HUH as a radiological technician. In 2013, he felt pain
    in his right shoulder while lifting a patient to prepare for an x-ray. Mr. Lyles
    received medical treatment and eventually filed a workers’ compensation claim
    seeking disability benefits pursuant to D.C. Code § 32-1508 (3)(A) and (S) (2012
    Repl.), which provide for compensation for permanent partial loss of the use of an
    arm. HUH did not dispute that Mr. Lyles had suffered a work-related injury and was
    entitled to some compensation. HUH and Mr. Lyles presented conflicting evidence
    about the extent of Mr. Lyles’s disability.
    At a February 2017 hearing before an administrative law judge (ALJ), Mr.
    Lyles testified that he still felt a burning and tearing sensation from his neck down
    into his arm, which was aggravated by motions such as lifting, pulling, and pushing.
    He further testified that his right arm was very weak and that he therefore did not
    use his right arm as much as he used to. At the time of the hearing, Mr. Lyles was
    3
    working for a new employer as a radiological technician/medical assistant. His
    duties for his new employer did not include pulling or lifting of patients or
    machinery. Mr. Lyles also testified that he was no longer able to bowl or lift heavy
    weights at the gym. Mr. Lyles acknowledged that he had suffered a previous injury
    to his right shoulder in 2011, while working for a different employer, and had
    claimed disability benefits from his employer in connection with that injury. That
    disability claim was settled.
    Mr. Lyles introduced the results of an independent medical examination
    conducted in 2016 by Dr. Matthew Menet. Dr. Menet concluded that Mr. Lyles still
    had difficulty lifting, reaching, and pulling. In opining about the extent of Mr.
    Lyles’s disability, Dr. Menet relied upon the Fourth Edition of the American Medical
    Association Guides to the Evaluation of Permanent Impairment (AMA Guides). Dr.
    Menet also considered pain, loss of function, weakness, and loss of endurance. Dr.
    Menet concluded that Mr. Lyles had a 47% permanent impairment to his right upper
    extremity. That figure rested on adding the following specific impairments: 3%
    based on lack of full range of motion, 12% for pain, 10% for weakness, 12% for loss
    of function, and 10% for loss of endurance. According to Dr. Menet, 20% of the
    47% impairment was related to Mr. Lyles’s 2011 injury and 27% was related to Mr.
    Lyles’s 2013 injury.
    4
    HUH introduced the results of an independent medical examination conducted
    in 2016 by Dr. Mark Scheer. Dr. Scheer relied on the Sixth Edition of the AMA
    Guides, as well as his assessment of Mr. Lyles’s pain, weakness, atrophy, loss of
    function, and loss of endurance. Dr. Scheer concluded that Mr. Lyles had a 4%
    permanent impairment to his right upper extremity. According to Dr. Scheer, 2% of
    the 4% impairment was preexisting and 2% was related to Mr. Lyles’s 2013 injury.
    The ALJ credited Mr. Lyles’s testimony and gave greater weight to Dr.
    Menet’s opinion than to Dr. Scheer’s opinion. With one exception, the ALJ adopted
    Dr. Menet’s calculations in determining the extent of Mr. Lyles’s disability. The
    exception was that the ALJ did not accept the 10% impairment based on loss of
    endurance, because Mr. Lyles had returned to full-time work as a radiological
    technician/medical assistant. The ALJ therefore concluded that Mr. Lyles had
    suffered a 37% permanent disability to his right upper extremity.
    The ALJ further concluded that HUH should be held responsible for all of the
    impairment at issue, not solely the portion of the impairment that was caused by Mr.
    Lyles’s most recent injury. The ALJ explained that apportionment of disability was
    precluded by D.C. Code § 32-1508 (6)(A) (“If an employee receives an injury,
    5
    which combined with a previous occupational or nonoccupational disability or
    physical impairment causes substantially greater disability or death, the liability of
    the employer shall be as if the subsequent injury alone caused the subsequent amount
    of disability . . . .”).
    HUH argued to the ALJ that, in determining the amount of Mr. Lyles’s award
    under § 32-1508 (3)(A) and (S), the ALJ should not consider the impairment to Mr.
    Lyles’s shoulder, because the shoulder is not part of the arm. Relying on the decision
    of the Compensation Review Board (CRB) in Lawson, CRB No. 14-056(R), 
    2017 WL 576074
    (Jan 11, 2017), the ALJ concluded that the shoulder is part of the arm
    for purposes of § 32-1508.
    HUH sought review before the CRB, which affirmed the ALJ’s compensation
    order. Among other things, HUH argued that, in calculating the amount of Mr.
    Lyles’s disability, the ALJ had not explained the connection between Mr. Lyles’s
    physical impairments and the extent of Mr. Lyles’s disability.             The CRB
    acknowledged that ALJs must specifically explain the nexus between physical-
    impairment factors -- including pain, weakness, atrophy, loss of endurance, and loss
    of function -- and a claimant’s “industrial capacity.” The CRB concluded, however,
    that the ALJ had adequately explained his conclusions.
    6
    Finally, the CRB concluded that § 32-1508 (6)(A), the provision the ALJ
    relied upon as precluding apportionment, had not been repealed by § 2 (e)(2) of the
    Workers’ Compensation Amendment Act (WCAA). D.C. Act 12-571, 46 D.C. Reg.
    891, 893-94 (1999). We discuss the CRB’s reasoning on that point more fully later
    in this opinion.
    II.
    We review a decision of the CRB to determine whether the decision was
    “arbitrary, capricious, an abuse of discretion, or otherwise not in accordance with
    law.” Reyes v. District of Columbia Dep’t of Emp’t Servs., 
    48 A.3d 159
    , 164 (D.C.
    2012) (internal quotation marks omitted). “Our principal function in reviewing
    administrative action is to assure that the agency has given full and reasoned
    consideration to all material facts and issues.” Georgetown Univ. Hosp. v. District
    of Columbia Dep’t of Emp’t Servs., 
    916 A.2d 149
    , 151 (D.C. 2007) (internal
    quotation marks omitted). We must defer to the CRB’s reasonable interpretation of
    statutes that the CRB is charged with administering. See, e.g., Pierce v. District of
    Columbia Police & Firefighters’ Ret. & Relief Bd., 
    882 A.2d 199
    , 205 (D.C. 2005).
    7
    A.
    HUH argues that the award to Mr. Lyles should be reduced because some of
    Mr. Lyles’s impairment was attributable to an earlier injury. HUH does not dispute
    that § 32-1508 (6)(A) by its terms precludes apportionment of disability. Rather,
    HUH argues that § 32-1508 (6)(A) was subsequently repealed, and an employer
    therefore now must only compensate that portion of a claimant’s disability that is
    attributable to a workplace injury that occurred during the claimant’s current
    employment. We remand this issue for further consideration by the CRB.
    As enacted in 1980, the Workers’ Compensation Act (WCA) permitted
    apportionment of disability, requiring a claimant’s current employer to compensate
    the claimant for only the new portion of a disability that arose in part from a prior
    injury and in part from a new injury. D.C. Act 3-188, § 9 (f), 27 D.C. Reg. 2503,
    2516 (1980).     The WCA did provide for additional compensation in such
    circumstances, but that compensation was paid by a special fund created for that
    purpose. 
    Id. Such funds,
    often called second-injury funds, have been a common
    feature of modern workers’ compensation statutes. 8 Lex K. Larson & Thomas A.
    Robinson, Larson’s Workers’ Compensation Law § 91.01 (2018).
    8
    The WCA was subsequently amended, however, in two pertinent respects.
    First, in cases involving disability arising in part from prior injury and in part from
    a subsequent injury, employers were made responsible “as if the subsequent injury
    alone caused the subsequent amount of disability.” D.C. Code § 32-1508 (6)(A).
    Thus, apportionment of disability was no longer permitted. Daniel v. District of
    Columbia Dep’t of Emp’t Servs., 
    673 A.2d 205
    , 208 (D.C. 1996) (discussing
    provision as previously codified at D.C. Code § 36-308 (6)(A) (1993 Repl.)).
    Presumably to mitigate the effect of that change on employers, and to avoid creating
    disincentives to the hiring of disabled workers, the WCA provided that the special
    fund would reimburse employers for benefits paid after 104 weeks. D.C. Code § 32-
    1508 (6)(A)(iii), (B).
    The provision currently at issue is § 2 (e)(2) of the WCAA, which provides
    that “Section 9 (D.C. Code § 36-308) [of the WCA] is amended as follows: . . . A
    new subsection (f)(3) is added to read as follows: ‘(3) The requirements of this
    subsection shall apply to injuries occurring prior to the effective date of the Workers’
    Compensation Amendment Act of 1998.’” 46 D.C. Reg. 893-94. Interpreting this
    provision requires a brief detour into the terminology and practices of statutory
    drafting and codification.
    9
    In drafting legislation, the D.C. Council, like the United States Congress,
    “ordinarily adheres to a hierarchical scheme in subdividing statutory sections,” using
    subsections starting with (a); paragraphs starting with (1); subparagraphs starting
    with (A), and clauses starting with (i). Koons Buick Pontiac GMC, Inc. v. Nigh, 
    543 U.S. 50
    , 60-61 (2004).      Applying that convention to the WCA as enacted,
    subdivision (f) of § 9 of the WCA is a subsection. The provision of the WCAA at
    issue, § 2 (e)(2), by its terms makes the requirements of § 9 (f) inapplicable to
    injuries that occur after the effective date of the WCAA. Thus, as the CRB
    acknowledged, § 2 (e)(2) of the WCAA by its terms appears to apply to the entire
    subsection of the WCA that addressed apportionment. Cf., e.g., NLRB v. SW Gen.,
    Inc., 
    137 S. Ct. 929
    , 938-39 (2017) (statutory cross-reference to section included all
    subsections of section). That would seemingly include the provision (now codified
    at D.C. Code § 32-1508 (6)(A)) that the ALJ relied upon as precluding
    apportionment.
    We pause to note a complication created by the way in which the WCA has
    been codified.   As currently codified, § 32-1508 is unconventionally labelled.
    Rather than having subsections labelled with lower-case letters starting with (a),
    § 32-1508 is initially subdivided using Arabic numerals starting with (1). D.C. Code
    § 32-1508. The codifier thus appears to have codified § 32-1508 as having no
    10
    subsections, making § 32-1508 (6) a paragraph. Presumably for that reason, the
    codifier changed the word “subsection” in § 2 (e)(2) of the WCCA to “paragraph”
    when codifying § 2 (e)(2). D.C. Code § 32-1508 (6)(C). It is a standard practice for
    codifiers to make conforming changes, including changes to cross-references. See
    generally Linda W. Cropp & Charlotte Brookins-Hudson, Preface to the 2001
    Edition of the D.C. Official Code vi (2012 Repl.) (D.C. Council’s Office of General
    Counsel codifies enactments of D.C. Council, including “interpret[ing] any
    discrepancies in the drafting of the laws[,] using commonly recognized rules of
    statutory construction”); 2 U.S.C. § 285b(4) (2017) (duties of federal Office of the
    Law Revision Counsel include “classify[ing] newly enacted provisions of law to
    their proper positions in the Code”). That appears to be what the codifier did in
    codifying § 2(e)(2) of the WCAA. As codified, that provision is a subparagraph,
    § 32-1508 (6)(C), that by its terms prospectively repealed the requirements in the
    rest of paragraph (6), including § 32-1508 (6)(A) and (B).
    As noted, the CRB acknowledged that § 32-1508 (6)(C) by its terms could be
    read to have prospectively repealed all of § 32-1508 (6). Nevertheless, relying
    primarily on the WCAA’s lengthy title (which the CRB referred to as a preamble),
    the CRB concluded that the D.C. Council had intended only to repeal the special
    fund that provided reimbursement to employers in cases involving disability that
    11
    arose in part from a prior injury and in part from a new injury, and that the D.C.
    Council had not intended to “[b]ring[] apportionment into the picture.” See 46 D.C.
    Reg. 891 (1999) (WCAA’s title refers in pertinent part “to repeal [of] the subsequent
    injury fund provisions with respect to injuries occurring after the effective date of
    this act”; no mention of apportionment of disability). By itself, however, the title of
    the WCAA is not a sufficient basis upon which to decline to give effect to the plain
    language of the text of § 2 (e)(2). See, e.g., Mitchell v. United States, 
    64 A.3d 154
    ,
    156 (D.C. 2013) (title of provision “cannot limit the plain meaning of the text”)
    (internal quotation marks omitted); see also, e.g., District of Columbia v. Heller, 
    554 U.S. 570
    , 578 n.3 (2008) (“[I]n America the settled principle of law is that the
    preamble cannot control the enacting part of the statute in cases where the enacting
    part is expressed in clear, unambiguous terms.”) (internal quotation marks omitted).
    In this court, HUH argues among other things that repealing the special-injury
    fund while still precluding apportionment is bad policy and requires subsequent
    employers to bear the expense of excessive disability payments to workers. HUH
    also argues that the CRB treated § 2 (e)(2) as prospectively repealing only § 32-
    1508 (6)(B), which addresses the special-fund reimbursement, without considering
    whether § 2 (e)(2) also prospectively repealed § 32-1508 (6)(A)(iii). As previously
    noted, in cases in which a claimant’s current disability rests in part on a prior
    12
    disability, the latter provision appears to limit the extent of the current employer’s
    obligation to pay monetary benefits to 104 weeks. D.C. Code § 32-1508 (6)(A)(iii).
    Thus, HUH argues, if only § 32-1508 (6)(B) was repealed, claimants in such cases
    would be limited to 104 weeks’ compensation and thus might not receive full
    compensation. The CRB did not explicitly address whether § 2 (e)(2) of the WCAA
    also repealed § 32-1508 (6)(A)(iii).
    We conclude that the matter must be remanded for the CRB to further consider
    the proper interpretation of § 2(e)(2) of the WCAA and its implications for
    apportionment under the WCA. As we have noted, the CRB in this case relied
    primarily on the title to the WCAA, which by itself cannot provide a basis for
    disregarding clear textual language. In a subsequent decision, the CRB discussed
    the issue somewhat more fully, taking into account the legislative history of the
    WCAA and discussing underlying considerations of policy. Brown, CRB No. 16-
    020(R), 
    2018 WL 4854481
    , at *4-6 (Sept. 5, 2018). Nevertheless, neither in this
    case nor in Brown did the CRB address the questions posed by the interaction of
    § 2 (e)(2) of the WCAA and D.C. Code § 32-1508 (6)(A)(iii). “[A]cknowledging
    the CRB’s expertise and responsibility for administering the [WCA],” we “remand[]
    the case to enable the CRB to consider [that issue] in the first instance.” Levy v.
    District of Columbia Dep’t of Emp’t Servs., 
    84 A.3d 518
    , 521 (D.C. 2014) (brackets
    13
    and internal quotation marks omitted). We express no view on the proper resolution
    of that issue.
    B.
    HUH also challenges the CRB’s conclusion that the shoulder is part of the
    arm for purposes of D.C. Code § 32-1508 (3)(A) and (S). We agree with HUH’s
    challenge.
    By way of background,
    The Workers’ Compensation Act divides permanent
    partial disabilities into two categories, “schedule” and
    “non-schedule.” Schedule disabilities are those involving
    the loss or impairment of certain specified body parts, e.g.,
    the loss of an arm, leg, or eye. For each such injury, a
    worker is entitled to receive 66 2/3% of his or her average
    weekly wages for a fixed number of weeks that varies
    depending on the particular body part injured . . . ,
    regardless of the actual wage loss the worker sustains as a
    result of the injury.
    Brown v. District of Columbia Dep’t of Emp’t Servs., 
    83 A.3d 739
    , 743 n.6 (D.C.
    2014). If a claimant loses partial use of a specified body part, the claimant is entitled
    to compensation in proportion to the degree of loss of use. D.C. Code § 32-
    1508 (3)(S). In determining the degree of loss of use of a schedule body part, the
    following factors may be considered: the most recent edition of the AMA Guides,
    14
    pain, weakness, atrophy, loss of endurance, and loss of function. D.C. Code § 32-
    1508 (3)(U-i). “In contrast, for other partially disabling injuries (i.e., to parts of the
    body not listed in the ‘schedule,’ such as the back or neck), the worker’s disability
    compensation is measured by his or her actual or imputed wage loss attributable to
    the injuries. See D.C. Code § 32–1508 (3)(V).” 
    Brown, 83 A.3d at 743
    n.6.
    In the present case, Mr. Lyles sought a schedule award under D.C. Code § 32-
    1508 (3)(A) and (S), which govern the partial loss of use of an arm. Some of the
    impairments upon which Mr. Lyles relied were to Mr. Lyles’s shoulder.                  To
    determine the degree to which Mr. Lyles lost the use of his arm, it thus was necessary
    to decide whether the shoulder is properly understood to be part of the arm for the
    purpose of determining a schedule award.
    In M.C. Dean, Inc. v. District of Columbia Department of Employment
    Services, 
    146 A.3d 67
    , 70-75 (D.C. 2016), this court addressed a case in which the
    CRB appeared to have treated the shoulder as part of the arm for the purpose of
    determining a schedule award. The court noted, however, that “the Department of
    Employment Services has previously interpreted the [WCA] to exclude the neck and
    shoulder from schedule arm awards.” Id at 73. We therefore remanded the case for
    the CRB to “clarify the definition[] of ‘arm.’” 
    Id. at 75.
                                              15
    On remand in the Dean case, the CRB concluded that the arm includes the
    shoulder for the purpose of determining a schedule award. Lawson, 
    2017 WL 576074
    , at *8. In the present case, the CRB relied upon in its earlier conclusion in
    Lawson, so our focus is on the CRB’s analysis in Lawson. In Lawson, the CRB
    noted that the WCA provides that the AMA Guides may be considered in
    “determining disability.” 
    Id. at *5
    (quoting D.C. Code § 32-1508 (3)(U-i)). For
    purposes of analyzing impairment, the AMA Guides use the term “upper
    extremit[y]” rather than “arm,” and they define the upper extremity to include four
    regions: the shoulder region, the elbow region, the wrist region, and the digit/hand
    region. 
    Id. at *6.
    Thus, the CRB concluded, “it is reasonable to infer that by making
    the [AMA] Guides an appropriate benchmark for assessing objective medical
    impairment, [the D.C.] Council intended that the anatomical description of the
    relevant body parts referenced in the [AMA] Guides would correspond to the
    anatomical body parts listed in the schedule.” 
    Id. at *8.
    The principal difficulty with
    this line of reasoning is that the body parts referenced in the AMA Guides do not
    correspond to the body parts listed in the schedule in D.C. Code § 32-1508 (3)(A)-
    (Q). Specifically, the AMA Guides include the hand and fingers as part of the upper
    extremity, Lawson, 
    2017 WL 576074
    , at *6, but the hand and fingers are treated
    separately from the arm under the statutory schedule, D.C. Code § 32-1508 (3)(A),
    16
    (C), (F), (G), (I), (J), (L) (separate provisions specifying amounts of compensation
    for loss of arm, hand, and fingers). The D.C. Council thus could not reasonably be
    understood to have intended for the anatomical divisions used in the AMA Guides
    to determine the interpretation of the anatomical terms used in the statutory schedule.
    Rather, the D.C. Council appears to have intended that the AMA Guides would be
    used in determining the degree of disability. We therefore are not persuaded by the
    CRB’s reason for concluding that the shoulder should be treated as part of the arm.
    Mr. Lyles advances an additional argument in support of the CRB’s
    conclusion. According to Mr. Lyles, “[t]he CRB concluded that sound public policy
    supports finding the shoulder is part of the arm, because the CRB has focused more
    and more on the place of functional disability, rather than the situs of injury, to assign
    disability under the [WCA].” Mr. Lyles’s argument rests on a misunderstanding of
    the CRB’s ruling in Lawson. In the passage from Lawson on which Mr. Lyles relies,
    the CRB described the competing arguments of the parties, without adopting those
    arguments. 
    2017 WL 576074
    , at *7. In general, an administrative order cannot be
    affirmed on grounds not relied upon by the agency. E.g., Douglas-Slade v. U.S.
    Dep’t of Transp., 
    959 A.2d 698
    , 702 (D.C. 2008). In any event, the argument
    presented by the employer in Lawson conflates two distinct issues. It is well settled
    under our law that a claimant who suffers an injury to a part of the anatomy that is
    17
    not listed in the statutory schedule may nevertheless seek recovery under the
    schedule if the consequence of that injury is the total or partial loss of use of a part
    of the anatomy that is listed in the statutory schedule. See, e.g., M.C. Dean, 
    Inc., 146 A.3d at 73
    (“[I]t is not the situs of the injury which determines whether a
    schedule award is payable; it is the situs of the disability resulting from the injury
    which is controlling.”) (internal quotation marks omitted).         Thus, even if the
    shoulder is not considered part of the arm, injury to the shoulder might provide a
    basis for a schedule award based on total or partial loss of use of the arm. Moreover,
    if the shoulder is not part of the arm, then a claimant who suffers injury to the
    shoulder would also have the option of seeking an unscheduled award by showing
    actual or imputed wage loss attributable to that injury. D.C. Code § 32-1508 (3)(V).
    In light of these considerations, we do not perceive a clear public-policy rationale
    that would necessitate treating the shoulder as part of the arm.
    Two other considerations bear on the CRB’s conclusion that the shoulder
    should be considered part of the arm. First, dictionary definitions of “arm” often
    refer somewhat ambiguously to the upper limb of the human body, but when they
    are anatomically specific they often exclude the shoulder. See, e.g., Webster’s Third
    New International Dictionary, Unabridged 118 (2002) (defining “arm” as “(1) a
    human upper limb; (2) the part of an arm between the shoulder and the wrist”);
    18
    American Heritage Dictionary of the English Language 100 (3d ed. 1992) (“An
    upper limb of the human body, connecting the hand and wrist to the shoulder.”). Cf.
    generally, e.g., O’Rourke v. District of Columbia Police & Firefighters’ Ret. &
    Relief Bd., 
    46 A.3d 378
    , 383 (D.C. 2012) (“The first step in construing a statute is to
    read the language of the statute and construe its words according to their ordinary
    sense and plain meaning.”) (internal quotation marks omitted).
    Second, the substantial weight of authority appears to support treating the
    shoulder as distinct from the arm for the purpose of determining a schedule award
    of workers’ compensation benefits. See, e.g., Keenan v. Dir. for Benefits Review
    Bd., 
    392 F.3d 1041
    , 1045 (9th Cir. 2004) (shoulder is not part of arm); Taylor v.
    Goodyear Tire & Rubber Co., 
    37 So. 3d 813
    , 820 (Ala. Civ. App. 2009) (“the
    shoulder is not part of the arm”) (internal quotation marks omitted); Safeway Stores,
    Inc. v. Indus. Comm’n, 
    558 P.2d 971
    , 974 (Ariz. Ct. App. 1976) (“the shoulder is a
    distinct anatomical entity, not part of the arm”) (citing cases); Safford v. Owens
    Brockway, 
    816 A.2d 556
    , 561 (Conn. 2003) (shoulders are “an unscheduled body
    part”); Jewell v. Wood, 
    130 So. 2d 277
    , 278 (Fla. 1961) (injury to shoulder is not
    injury to arm); Gentry v. Ga. Cas. & Sur. Co., 
    131 S.E.2d 788
    , 790 (Ga. Ct. App.
    1963) (“The shoulder, as we construe the law, is not a part of the arm.”); Will Cty.
    Forest Preserve Dist. v. Ill. Workers’ Comp. Comm’n, 
    970 N.E.2d 16
    , 24 (Ill. App.
    19
    Ct. 2012) (“the shoulder is not part of the arm”) (citing cases); Second Injury Fund
    v. Nelson, 
    544 N.W.2d 258
    , 269-70 (Iowa 1995) (injury to shoulder is not schedule
    injury); Getson v. WM Bancorp, 
    694 A.2d 961
    , 964-69 (Md. 1997) (“shoulder
    injuries are unscheduled”) (citing cases); Foster v. State Accident Ins. Fund, 
    485 P.2d 407
    , 408-09 (Or. 1971) (treating shoulder as unscheduled body part); Cont’l
    Ins. Cos. v. Pruitt, 
    541 S.W.2d 594
    , 595-96 (Tenn. 1976) (shoulder is not part of
    arm). We note that workers’ compensation law in some of the cited jurisdictions
    differs in important respects from the law in this jurisdiction. By citing the foregoing
    cases for the specific principle at issue in this case, we do not mean to imply
    endorsement of the holdings of those cases on other issues.
    We are aware of three jurisdictions that treat the shoulder as a schedule body
    part, but in each of those jurisdictions the statutory schedule specifically refers to the
    shoulder. Strauch v. PSL Swedish Healthcare Sys., 
    917 P.2d 366
    , 367 (Colo. App.
    1996) (“loss of an arm at the shoulder”); Mitchell v. Petsmart, Inc., 
    239 P.3d 51
    , 60
    (Kan. 2010) (“loss of an arm, including the shoulder joint, shoulder girdle, shoulder
    musculature or any other shoulder structures”); Hagen v. Labor & Indus. Review
    Comm’n, 
    563 N.W.2d 454
    , 457 (Wis. 1997) (“loss of an arm at the shoulder”).
    20
    For the foregoing reasons, we are not persuaded that the CRB has articulated
    a reasonable basis for treating the shoulder as part of the arm when determining a
    schedule award. To the contrary, we conclude that the CRB’s decision to treat the
    shoulder as part of the arm was unreasonable as a matter of law. Cf. generally, e.g.,
    District of Columbia Office of Human Rights v. District of Columbia Dep’t of Corr.,
    
    40 A.3d 917
    , 923 (D.C. 2012) (concluding that agency interpretation of statute was
    unreasonable as matter of law). We therefore vacate the order of the CRB and
    remand for further proceedings focused on the degree to which Mr. Lyles has lost
    the use of his arm, not including the shoulder. We reiterate, however, that Mr. Lyles
    is not foreclosed from relying on impairments of his shoulder that have as their
    consequence partial or total loss of the use of his arm.
    C.
    HUH finally argues that the CRB erred by concluding that, in calculating the
    amount of the award, the ALJ adequately explained the connection between Mr.
    Lyles’s physical impairments and the extent of Mr. Lyles’s disability. We agree.
    Here too some background is necessary. If a claimant suffers total loss of a
    schedule body part, or total loss of use of a body part, the WCA provides a set
    21
    amount of compensation, generally 66⅔% of the claimant’s average weekly wages
    for a specified duration that varies depending on the body part at issue. D.C. Code
    § 32-1508 (3)(A)-(R). A claimant seeking such an award is not required to introduce
    any evidence about the actual or likely effect of the loss on the claimant’s wages or
    employment prospects. E.g., Smith v. District of Columbia Dep’t of Emp’t Servs.,
    
    548 A.2d 95
    , 101 (D.C. 1988). As we explained in Smith,
    The typical schedule, limited to obvious and easily-
    provable losses of [schedule body parts], was justified on
    two grounds: the gravity of the impairment supported a
    conclusive presumption that actual wage loss would
    sooner or later result; and the conspicuousness of the loss
    guaranteed that awards could be made with no controversy
    whatsoever. Although impaired earning capacity need not
    be proved to receive schedule benefits, this is not to be
    interpreted as an erratic deviation from the underlying
    principle of compensation law—that benefits relate to loss
    of earning capacity and not to physical injury as such. The
    basic theory remains the same; the only difference is that
    the effect on earning capacity is a conclusively presumed
    one, instead of a specifically proved one based on the
    individual’s actual wage-loss experience.
    
    Id. (ellipsis, citation,
    brackets, and internal quotation marks omitted).
    A claimant may also seek a schedule award based on partial loss of use of a
    schedule body part. D.C. Code § 32-1508 (3)(S). As previously noted, the WCA
    generally provides that six factors may be considered in determining disability for
    purposes of schedule awards: the AMA Guides, pain, weakness, atrophy, loss of
    22
    endurance, and loss of function. D.C. Code § 32-1508 (U-i). Those factors thus are
    relevant to determining the degree of partial loss of use. Our cases indicate,
    however, that the amount of a partial-loss schedule award is not properly determined
    based solely on a non-economic medical determination as to the degree of physical
    impairment of the body part at issue. Negussie v. District of Columbia Dep’t of
    Emp’t Servs., 
    915 A.2d 391
    , 399 (D.C. 2007) (“‘[D]isability’ is an economic and
    legal concept which should not be confounded with a medical condition . . . .”).
    Rather, in the context of partial-loss schedule awards, we have stated that
    “compensation under the [WCA] is predicated upon the loss of wage earning
    capacity, or economic impairment, and not upon functional disability or physical
    impairment.” Dent v. District of Columbia Dep’t of Emp’t Servs., 
    158 A.3d 886
    ,
    901 (D.C. 2017) (internal quotation marks omitted). We also have said that the six
    statutory factors “may be considered by the ALJ and the CRB in making a schedule
    award for permanent partial disability to compensate for loss of wage-earning
    capacity.” 
    Id. at 902;
    see also 
    id. at 903
    (“The ALJ’s ability to come to a considered
    judgment of the extent of permanent partial disability is particularly important in the
    context of a schedule award. Because a schedule award is a one-time payment meant
    to compensate for the loss of future wage-earning capacity resulting from a work
    injury, it necessarily involves an element of prediction. Determining the extent of
    disability thus requires a highly fact-bound inquiry that takes into account the
    23
    particulars of the individual claimant, such as employment skills, experience, age,
    education, and reasonable prospects; evidence of post-injury wages, compared with
    pre-injury wages, may be more or less probative of loss of future wage-earning
    capacity depending on the facts of the case. It is for the ALJ to consider and weigh
    the relevant evidence presented in a given case.”) (citation and internal quotation
    marks omitted).
    As previously noted, Dr. Menet concluded that Mr. Lyles had a 47%
    permanent impairment to his right upper extremity, based on the following specific
    impairments: 3% based on lack of full motion, 12% for pain, 10% for weakness,
    12% for loss of function, and 10% for loss of endurance. Dr. Menet did not tie those
    calculations to predictions about Mr. Lyle’s future wage-earning capacity. The ALJ
    accepted Dr. Menet’s calculations, with one exception: the ALJ did not accept the
    10% impairment based on loss of endurance, because Mr. Lyles had returned to full-
    time work as a radiological technician/medical assistant.      The ALJ therefore
    concluded that Mr. Lyles had suffered a 37% permanent disability to his right upper
    extremity. The ALJ did not explain how Dr. Menet’s other calculations related to
    Mr. Lyles’s future wage-earning capacity.
    24
    The CRB acknowledged that ALJs must specifically explain the nexus
    between the statutory factors of pain, weakness, atrophy, loss of endurance, and loss
    of function and a claimant’s “industrial capacity.” (The CRB has equated “industrial
    capacity” and “wage-earning capacity.” 
    Dent, 158 A.3d at 898
    (internal quotation
    marks omitted).) The CRB concluded, however, that the ALJ had adequately
    explained his conclusions. We do not agree. The ALJ did not explain the likely
    consequences, if any, that Mr. Lyles’s physical impairments would have for Mr.
    Lyles’s wage-earning capacity. We therefore must remand for the ALJ to provide
    the necessary explanation. See generally, e.g., Bowles v. District of Columbia Dep’t
    of Emp’t Servs., 
    121 A.3d 1264
    , 1269 (D.C. 2015) (“When the ALJ fails to explain
    its reasoning in arriving at a disability award[,] such that we are unable to
    meaningfully review the decision to determine whether it is based on substantial
    evidence, we must remand the case back to the CRB.”) (brackets and internal
    quotation marks omitted).
    For the foregoing reasons, we vacate the order of the CRB and remand the
    case for further proceedings.
    So ordered.