Boone v. Comm Social Security ( 2003 )


Menu:
  •                                                                                                                            Opinions of the United
    2003 Decisions                                                                                                             States Court of Appeals
    for the Third Circuit
    12-18-2003
    Boone v. Comm Social Security
    Precedential or Non-Precedential: Precedential
    Docket No. 02-3256
    Follow this and additional works at: http://digitalcommons.law.villanova.edu/thirdcircuit_2003
    Recommended Citation
    "Boone v. Comm Social Security" (2003). 2003 Decisions. Paper 7.
    http://digitalcommons.law.villanova.edu/thirdcircuit_2003/7
    This decision is brought to you for free and open access by the Opinions of the United States Court of Appeals for the Third Circuit at Villanova
    University School of Law Digital Repository. It has been accepted for inclusion in 2003 Decisions by an authorized administrator of Villanova
    University School of Law Digital Repository. For more information, please contact Benjamin.Carlson@law.villanova.edu.
    PRECEDENTIAL
    Filed December 18, 2003
    UNITED STATES COURT OF APPEALS
    FOR THE THIRD CIRCUIT
    No. 02-3256
    SARAH M. BOONE,
    Appellant
    v.
    *JO ANNE BARNHART
    COMMISSIONER OF SOCIAL SECURITY
    *(Pursuant to F.R.A.P. 43(c))
    Appeal from the United States District Court
    for the Eastern District of Pennsylvania
    (D.C. Civil Action No. 01-cv-04231)
    District Judge: Honorable Herbert J. Hutton
    Argued March 13, 2003
    Before: BECKER,* RENDELL, and AMBRO, Circuit Judges
    (Opinion filed December 18, 2003)
    Peter J. Pinnola, Esquire (Argued)
    Pinnola & Bomstein
    8039 Old York Road
    Elkins Park, PA 19027
    Attorney for Appellant
    * Judge Becker concluded his term as Chief Judge on May 4, 2003.
    2
    James A. Winn
    Regional Chief Counsel
    Lori Karimoto (Argued)
    Assistant Regional Counsel
    Office of the General Counsel
    Social Security Administration
    OGC/Region III
    P.O. Box 41777
    Philadelphia, PA 19101
    Patrick L. Meehan
    United States Attorney
    Joan Garner
    Assistant United States Attorney
    Eastern District of Pennsylvania
    615 Chestnut Street, Suite 1250
    Philadelphia, PA 19106-4476
    Attorneys for Appellee
    OPINION OF THE COURT
    AMBRO, Circuit Judge:
    Sarah M. Boone challenges the Social Security
    Commissioner’s determination that she is not disabled and
    therefore not entitled to Supplemental Security Income
    (“SSI”) disability benefits. She makes several arguments,
    each of which pertains to the Administrative Law Judge’s
    (“ALJ”) determination that she can perform work that exists
    in significant numbers in the regional or national economy.1
    We agree with Boone that the record lacks substantial
    evidence that she can perform such work and, thus, is not
    disabled. We therefore reverse and remand.
    BACKGROUND
    Boone applied in November 1998 for SSI disability
    benefits under Title XVI of the Social Security Act, alleging
    1. The ALJ’s opinion became the final decision of the Commissioner
    because the Appeals Council declined to review it.
    3
    disability due to back and leg disorders, carpal tunnel
    syndrome, and high blood pressure. To show disability for
    purposes of SSI, a claimant must demonstrate that she
    lacks the ability “to engage in any substantial gainful
    activity by reason of any medically determinable physical or
    mental impairment.” 42 U.S.C. § 1382c(a)(3)(A). The ALJ
    found that Boone suffers from severe impairments but, as
    noted above, that she is not disabled because there are a
    significant number of jobs in the national economy that she
    can perform.
    Boone was fifty-three years old at the alleged onset date
    of her disability in November 1998. She has an eleventh
    grade education and, although she has not worked since
    1986, has past experience as an office cleaner as well as a
    meat weigher and wrapper.
    After she was involved in a bus accident in the 1980s,
    Boone underwent back surgery. She has sought assistance
    from pain specialists since that time. The ALJ found that
    she has a continuing back disorder caused by degenerative
    disc disease, spinal stenosis, a disc bulge, and left leg
    radiculopathy, and that she suffers from carpal tunnel
    syndrome and right knee pain.2 The ALJ therefore
    concluded that Boone is severely impaired.
    Looking to the effect of Boone’s impairments, the ALJ
    found that she cannot perform her past work as an office
    cleaner or meat weigher and wrapper, but that she does
    retain the capacity to perform “a range of light level work.”3
    In particular, she can stand, walk, and sit for six hours out
    of an eight-hour day. Any employment must, however,
    permit her to sit and stand at will every thirty minutes. She
    can lift and carry twenty pounds occasionally and ten
    2. Because, as discussed below, the ALJ correctly evaluated Boone’s
    medical impairments and resulting limitations, we rely upon his findings
    and do not describe the various medical reports and other evidence
    supporting them. We also note that Boone does not challenge the ALJ’s
    finding that her blood pressure is well-controlled with medicine and so
    does not impair her ability to work.
    3. Social Security regulations classify jobs in one of five categories
    depending on the physical exertion they require: sedentary, light,
    medium, heavy, and very heavy. 
    20 C.F.R. § 416.967
    .
    4
    pounds frequently. She has no limitations in pushing or
    pulling, but must not be required to perform repetitive
    hand activity. Only occasionally can she climb, balance,
    kneel, stoop, crouch, or crawl.
    On the basis of the physical limitations identified by the
    ALJ and considering Boone’s age, education, and unskilled
    work history, a vocational expert (“VE”) testified that Boone
    has the ability to work as an inventory clerk, a home health
    aide, or a sales counter clerk. According to the VE, there
    are 2,600 inventory clerk jobs in the regional economy and
    127,000 such jobs in the national economy; there are 5,800
    home health aide jobs regionally and 322,000 nationally;
    and 1,500 sales counter clerk jobs exist regionally and
    95,000 nationally. The ALJ concluded that these
    occupations represent a significant number of jobs existing
    in the national economy and, accordingly, that Boone is not
    disabled.
    After the Appeals Council denied her request for review,
    Boone timely appealed to the United States District Court
    for the Eastern District of Pennsylvania. The parties filed
    cross-motions for summary judgment. A magistrate judge
    recommended granting the Commissioner’s motion for
    summary judgment, which the Court did on June 17, 2002.
    Boone timely appealed to this Court. We have jurisdiction
    pursuant to 
    28 U.S.C. § 1291
     and 
    42 U.S.C. § 405
    (g).
    DISCUSSION
    We review de novo the District Court’s grant of summary
    judgment in favor of the Commissioner but may reverse
    only if “the ALJ’s findings were not supported by
    ‘substantial evidence.’ ” Burns v. Barnhart, 
    312 F.3d 113
    ,
    118 (3d Cir. 2002). Substantial evidence is less than a
    preponderance but more than a scintilla; it is “such
    relevant evidence as a reasonable mind might accept as
    adequate.” 
    Id.
    A five-step process is used to determine disability for SSI
    benefits eligibility, see 
    20 C.F.R. § 416.920
    , but in this case
    only step five is in dispute.4 At the fifth step, the
    4. At the first step, the claimant will be found not disabled if she is
    currently engaging in “substantial gainful activity.” 20 C.F.R.
    5
    Commissioner bears the burden of proving that,
    considering the claimant’s residual functional capacity,5
    age, education, and past work experience, she can perform
    work that exists in significant numbers in the regional or
    national economy. 
    42 U.S.C. § 423
    (d)(2)(A); see also Bowen
    v. Yuckert, 
    482 U.S. 137
    , 146 n.5 (1987); Sykes v. Apfel,
    
    228 F.3d 259
    , 263 (3d Cir. 2000).
    A.   Vocational Expert Testimony
    At the fifth step of the evaluation process, “the ALJ often
    seeks advisory testimony from a vocational expert. In
    addition, the ALJ will generally consult the Dictionary of
    Occupational Titles (“DOT”), a publication of the United
    States Department of Labor that contains descriptions of
    the requirements for thousands of jobs that exist in the
    national economy, in order to determine whether any jobs
    exist that a claimant can perform.” Burns, 
    312 F.3d at 119
    ;
    see also 
    id. at 126
     (The “Social Security Administration has
    taken administrative notice of the reliability of the job
    information contained in the [DOT].”) (citing 
    20 C.F.R. § 416.966
    (d) (2002)). Boone argues for reversal of the ALJ’s
    non-disability determination on the grounds that the VE’s
    testimony that Boone can work as an inventory clerk, a
    home health aide, and a sales counter clerk conflicts with
    the DOT and that neither the VE nor the ALJ addressed the
    conflict. While we do not adopt a general rule that an
    unexplained conflict between a VE’s testimony and the DOT
    necessarily requires reversal, we do conclude that the VE’s
    testimony in this case is not substantial evidence.6
    § 416.920(a). At step two, the claimant must demonstrate that she
    suffers from a “severe medically determinable physical or mental
    impairment,” or she will be found not disabled. Id. If the claimant can
    show at the third step that her impairments meet or equal an
    impairment listed in Appendix 1 to Subpart P of Part 404, she will be
    found per se disabled. Id. Step four requires the claimant to show that
    she cannot perform her past work. Id.
    5. A claimant’s “residual functional capacity” is what she can do despite
    the limitations caused by her impairments. Fargnoli v. Massanari, 
    247 F.3d 34
    , 40 (3d Cir. 2001).
    6. As we discuss below, Social Security Ruling 00-4p addresses how a
    conflict between VE testimony and the DOT should be resolved. The ALJ
    in this case issued his decision prior to the enactment of SSR 00-4p.
    Our opinion on this issue is thus limited to those situations.
    6
    In response to the ALJ’s hypothetical question as to the
    availability of jobs for an individual with Boone’s residual
    functional capacity, age, and experience, the VE testified:
    There would be some jobs that this individual could
    perform given the limitations that have been outlined
    in the hypothetical, and I’m going to have to think
    about this a bit. But I think that I would look at the
    following positions: The first job that I, I would identify
    as appropriate would be an inventory clerk. I’d be glad
    to give any of those definitions through explanations of
    these jobs. There’s very little, if any, use — I mean
    there’s very little use of the hands, and it’s certainly
    not provide [sic] bimanual repetitive activities. And
    they’re in a region, there’s about 2,600 of those jobs. In
    the nation, there’s 127,000. The job that I, that I was
    — I’m thinking about, but I think still would be
    appropriate and this is what I’m hesitating about,
    would be a home health aid [sic] at the light exertional
    level. It would be 5,800 of those jobs in the region and
    322,000 nationally. A third job that I would look at as
    a possibility would be — I’m kind of going over in my
    mind the number of positions, but I want to make sure
    they kind of fit. What I’m looking for, I think[, is] an
    unskilled, sales counter clerk, which there are about
    1,500 in the region and 95,000 nationally.
    We consider first the three occupations identified by the
    VE as suitable for Boone. The DOT classifies the occupation
    “inventory clerk” in the medium exertional level with a
    “specific vocational preparation” (“SVP”) of 4.7 DOT
    § 222.387-026. Occupations with an SVP of 3 or 4 are
    7. The DOT states that an inventory clerk does the following: “Compiles
    and maintains records of quantity, type, and value of material,
    equipment, merchandise, or supplies stocked in establishment: Counts
    material, [etc.] . . . in stock and posts total to inventory records,
    manually or using computer. Compares inventories to office records or
    computes figures from records, such as sales orders, production records,
    or purchase invoices to obtain current inventory. Verifies clerical
    computations against physical count of stock and adjusts errors in
    computation or count, or investigates and reports reasons for
    discrepancies. Compiles information on receipt or disbursement of
    material, [etc.] . . . , and computes inventory balance, price, and cost.
    Prepares reports, such as inventory balance, price lists, and shortages.
    Prepares list of depleted items and recommends survey of defective or
    unusable items. May operate office machines, such as typewriter or
    calculator. May stock and issue materials or merchandise.” DOT
    § 222.387-026.
    7
    semi-skilled. Because the ALJ found that Boone can do
    only a limited range of light, unskilled work — not medium8
    or semi-skilled work — she cannot perform the job of
    inventory clerk as it is described in the DOT.
    Likewise, the DOT describes a home health aide job as
    falling in the medium exertional level and with an SVP of 3.9
    DOT 354.377-014. The VE specified that Boone could work
    as “a home health aid[e] at the light exertional level.” On
    cross-examination, Boone’s counsel asked the VE about the
    extent of lifting required of a home health aide. She replied:
    One of the things that I’d think you have to look at
    when you talk about a home health aid[e] is, is that
    there are various levels of, of care needed that are
    provided to the elderly or the disabled. Some people
    need a lot of physical care and need to be able to
    transfer it, need to be . . . able to do heavy lifting.
    There are some people that for instance, that might
    have slight problems and just need help with their —
    a little bit of help with their ADL to act as a
    companion. And that — at that exertional level, it’s
    fairly light . . . .
    8. The ALJ found that Boone can lift and carry twenty pounds
    occasionally and ten pounds frequently. “Medium work involves lifting no
    more than 50 pounds at a time with frequent lifting or carrying of
    objects weighing up to 25 pounds.” 
    20 C.F.R. § 416.967
    (c).
    9. The DOT states that a home health aide “[c]ares for elderly,
    convalescent, or handicapped persons in patient’s home, performing any
    combination of following tasks: Changes bed linens, washes and irons
    patient’s laundry, and cleans patient’s quarters. Purchases, prepares,
    and serves food for patient and other members of family, following
    special prescribed diets. Assists patients into and out of bed, automobile,
    or wheelchair, to lavatory, and up and down stairs. Assists patient to
    dress, bathe, and groom self. Massages patient and applies preparations
    and treatments, such as liniment or alcohol rubs and heat-lamp
    stimulation. Administers prescribed oral medications under written
    direction of physician or as directed by home care nurse. Accompanies
    ambulatory patients outside home, serving as guide, companion, and
    aide. Performs variety of miscellaneous duties as requested, such as
    obtaining household supplies and running errands. May maintain
    records of services performed and of apparent condition of patient. May
    visit several households to provide daily health care to patients.” DOT
    354.377-014.
    8
    Although the VE did recognize that Boone cannot perform
    all home health aide jobs, it is unclear whether the
    numbers that the VE had earlier provided (5,800 regionally
    and 322,000 nationally) included the medium exertional
    level jobs in the home health aide occupation. We also lack
    any basis to conclude that the VE discounted the semi-
    skilled jobs, which Boone cannot perform, from the number
    of jobs identified.
    Finally, although the DOT does not include an entry for
    “sales counter clerk,” it does list “sales clerk” and “sales
    attendant” positions. A sales clerk has an SVP of 3, a semi-
    skilled occupation and therefore inappropriate for Boone.
    DOT § 290.477-014. Although sales attendant is an
    unskilled occupation with a light exertional level, according
    to the companion volume to the DOT (Special
    Characteristics of Occupations), the job involves frequent
    reaching, handling, and fingering, which Boone’s limitation
    on repetitive hand activities may preclude. Moreover, the
    sales attendant position would not seem to accommodate
    Boone’s need to be able to sit or stand at will, but instead
    likely requires standing or walking throughout the shift.10
    Id.
    Thus, according to the DOT, Boone cannot perform any
    of the occupations identified by the VE. Neither the VE nor
    the ALJ in his opinion acknowledged the conflict between
    the VE’s testimony and the DOT or explained why the VE’s
    testimony should be relied on despite the conflict.11
    10. The DOT states that a sales attendant “[p]erforms any combination
    of following duties to provide customer service in self-service store: Aids
    customers in locating merchandise. Answers questions from and
    provides information to customer about merchandise for sale. Obtains
    merchandise from stockroom when merchandise is not on floor.
    Arranges stock on shelves or racks in sales area. Directs or escorts
    customer to fitting or dressing rooms or to cashier. Keeps merchandise
    in order. Marks or tickets merchandise. Inventories stock.” DOT
    § 299.677-010.
    11. On cross-examination before the ALJ, Boone’s attorney asked the VE
    if she had “the DOT numbers” for the jobs she identified, to which she
    replied: “No, but I’d be glad to get them for you, that’s not a problem.”
    Boone’s counsel did not follow up on the issue, and the Commissioner
    9
    In Burns, 
    312 F.3d 113
    , we addressed the import of an
    unexplained conflict between VE testimony and the DOT.
    We recognized that there is a split among circuit courts,
    with several holding that “an ALJ may base his conclusions
    on a vocational expert’s testimony that conflicts with the
    DOT,”12 
    id.
     at 127 n.8, one requiring the ALJ always to
    “prefer the DOT over the testimony of a vocational expert,”13
    
    id.,
     and others adopting a “middle view” in which the ALJ
    must “explain any decision to prefer the testimony of a
    vocational expert over the DOT.”14 
    Id.
     We did not, however,
    therefore asserts that we should ignore the conflict and lack of
    reconciling explanation. Boone’s question to the VE, however, sufficiently
    raised the issue before the ALJ for purposes of our review. Moreover, the
    ALJ had a duty to follow up on Boone’s inquiry to ensure a complete
    record. See Ventura v. Shalala, 
    55 F.3d 900
    , 902 (3d Cir. 1995) (ALJ has
    a “duty to develop a full and fair record”); Mayes v. Massanari, 
    276 F.3d 453
    , 459 (9th Cir. 2001) (“In Social Security cases, the ALJ has a special
    duty to develop the record fully and fairly and to ensure that the
    claimant’s interests are considered, even when the claimant is
    represented by counsel.”); Shaw v. Chater, 
    221 F.3d 126
    , 131 (2d Cir.
    2000) (similar statement); Freeman v. Apfel, 
    208 F.3d 687
    , 692 (8th Cir.
    2000) (similar statement).
    12. See Carey v. Apfel, 
    230 F.3d 131
    , 146 (5th Cir. 2000); Jones v. Apfel,
    
    190 F.3d 1224
    , 1229-30 (11th Cir. 1999); Connecticut v. Sec’y of Heath
    & Human Servs., 
    51 F.3d 607
    , 610 (6th Cir. 1995). The Fifth Circuit
    requires that “the record reflect[ ] an adequate basis” for preferring the
    VE’s testimony to the DOT. Carey, 
    230 F.3d at 146
    .
    13. See Smith v. Shalala, 
    46 F.3d 45
    , 47 (8th Cir. 1999). Burns noted,
    however, that the Eighth Circuit “seems to have quickly retreated from
    that bright-line rule.” Burns, 
    312 F.3d at
    127 n.8 (citing Montgomery v.
    Chater, 
    69 F.3d 273
     (8th Cir. 1995)).
    14. See Haddock v. Apfel, 
    196 F.3d 1084
    , 1091 (10th Cir. 1999); Mimms
    v. Heckler, 
    750 F.2d 180
    , 186 (2d Cir. 1984).
    We further noted that Social Security Ruling SSR 00-4p “squarely
    addresses how this situation should be handled.” Burns, 
    312 F.3d at 127
    . The Ruling adopts the middle ground and further puts the burden
    on the ALJ to uncover the existence of any conflicts between the VE’s
    testimony and the DOT:
    Social Security Ruling 00-4p requires that the ALJ ask the
    vocational expert whether any possible conflict exists between the
    10
    need to choose among the various alternative options to
    resolve a conflict between VE testimony and the DOT
    because we remanded on other grounds. 
    Id. at 127
    .15
    Although the individualized analysis that the middle course
    represents seems to be the most sensible of the options, we
    again do not hold that the failure of an ALJ (prior to the
    enactment of SSR 00-4p) to discover and explain a conflict
    necessarily requires reversal.
    We are further troubled, however, by the hesitation with
    which the VE identified the three possible occupations for
    Boone. See Sias v. Sec’y of Heath & Human Servs., 
    861 F.2d 475
     (6th Cir. 1988) (“[I]f the expert is unable to testify
    without qualification about the jobs a claimant can
    perform, the ALJ may not rely on his opinion.”); Hall v.
    Bowen, 
    837 F.2d 272
    , 274 (6th Cir. 1988) (interpreting an
    earlier Sixth Circuit case as holding in favor of the claimant
    because of “the failure of the vocational expert to testify
    without qualification that jobs which the plaintiff could
    perform actually existed in the economy.”) (citing Graves v.
    Sec’y of Health, Educ., & Welfare, 
    473 F.2d 807
    , 809 (6th
    Cir. 1973)). Here, the VE testified:
    There would be some jobs that this individual could
    perform given the limitations that have been outlined
    vocational expert’s testimony and the DOT, and that, if the
    testimony does appear to conflict with the DOT, to ‘elicit a
    reasonable explanation for the apparent conflict.’ The Ruling
    requires that the explanation be made on the record and that the
    ALJ explain in his decision how the conflict was resolved.
    
    Id.
    SSR 00-4p sets requirements for an ALJ to follow in any case decided
    after its enactment. Here, as already noted, the hearing occurred and the
    ALJ rendered his decision before the enactment of SSR 00-4p.
    15. Although we so stated, we nonetheless seemed to adopt the middle
    course: “Burns argues that the vocational expert’s testimony that he
    could work as a laundry sorter, packer, or ticket taker, adopted by the
    ALJ for his findings of fact, was inconsistent with the DOT in several
    respects, and that any inconsistencies should have been explained by
    the vocational expert as well as by the ALJ in his decision. We agree.” Id.
    at 126.
    11
    in the hypothetical, and I’m going to have to think
    about this a bit. But I think that I would look at the
    following positions . . . .
    (Emphases added.) Discussing the home health aide
    occupation, the VE stated:
    The job that I, that I was — I’m thinking about, but I
    think still would be appropriate and this is what I’m
    hesitating about, would be a home health aid [sic] at
    the light exertional level.
    (Emphasis added.) And regarding the sales counter clerk,
    she said:
    A third job that I would look at as a possibility would
    be — I’m kind of going over in my mind the number of
    positions, but I want to make sure they kind of fit.
    What I’m looking for, I think an unskilled, sales
    counter clerk, which there are about 1,500 in the
    region and 95,000 nationally.
    (Emphasis added.)
    Given this hesitation, the conflict between the VE’s
    testimony and the DOT — which worked to Boone’s
    disadvantage — as to each occupation identified by the VE,
    and the failure of the VE and the ALJ to acknowledge
    (much less explain) the conflict, we conclude that the VE’s
    testimony does not by itself provide substantial evidence of
    a significant number of jobs in the economy that Boone can
    perform. We must consider, however, whether the record
    otherwise contains such evidence.
    B.   “Erosion of the Occupational Base”
    There is no dispute that, because of her age, limited
    education, and unskilled work experience, Boone is
    disabled if she has the physical ability to do only sedentary
    work. See 20 C.F.R. pt. 404, subpt. P, app. 2, § 201.00(g)
    (“Individuals approaching advanced age (age 50-54) may be
    significantly limited in vocational adaptability if they are
    restricted to sedentary work. When such individuals . . .
    can no longer perform vocationally relevant past work and
    have no transferable skills, a finding of disabled ordinarily
    obtains.”). The parties also agree that Boone is not disabled
    12
    if she can perform the full range of light work. See id.
    § 202.00. Her residual functional capacity does not,
    however, fall neatly into either category. Rather, as noted
    above, the ALJ found that Boone can do a limited range of
    light work.
    Boone asserts that the ALJ committed per se reversible
    error by failing to specify how limited the range of light
    work that she can perform is and by not addressing
    whether she is also limited in the range of sedentary work
    that she can do. Social Security Ruling 83-12 directs that
    if the claimant’s residual functional capacity does not
    coincide with any of the established categories, the ALJ
    “will consider the extent of any erosion of the occupational
    base and assess its significance.” Id.16 Thus, Boone’s
    argument, in the language of SSR 83-12, is that the ALJ
    should have assessed the “extent” of the “erosion of the
    occupational base” for both the sedentary and light work
    that she can perform.
    SSR 83-12 further states, however, that where “difficult
    judgments are involved” in the categorization of a
    claimant’s work ability, VE “assistance is advisable.” Id. The
    Ruling so advises because a VE can provide a more
    individualized analysis as to what jobs the claimant can
    and cannot perform than does a determination of the
    claimant’s remaining occupational base. Id.17 Consequently,
    we shall not interpret SSR 83-12 to mandate reversal
    whenever the ALJ does not set out specific findings
    concerning the erosion of the occupational base if, as here,
    the ALJ has received the assistance of a VE in considering
    the more precise question whether there are a significant
    number of jobs in the economy that the claimant can
    perform. At the same time, however, the absence of those
    findings means that we are hindered in considering
    whether substantial evidence supports the ALJ’s ultimate
    determination that Boone is not disabled.
    16. The Ruling is binding on the agency. See 
    20 C.F.R. § 402.35
    (b)(1).
    17. See also, e.g., 
    20 C.F.R. § 416.966
    (e) (“If the issue in determining
    whether you are disabled is whether your work skills can be used in
    other work and the specific occupations in which they can be used, or
    there is a similarly complex issue, [the ALJ] may use the services of a
    vocational expert or other specialist.”).
    13
    The Commissioner contends, however, that, because the
    ALJ found that Boone can do a limited range of light work,
    she can perform the 200 unskilled sedentary occupations,
    see 20 C.F.R. pt. 404, subpt. P., app. 2, § 202.00(a), and
    the approximately 1,400 unskilled light level occupations,
    see id. § 201.00(a), that exist in the national economy.
    We cannot agree. SSR 83-12 makes clear that if a person
    “must alternate periods of sitting and standing,” as Boone
    must have the option to do, she “is not functionally capable
    of doing either the prolonged sitting contemplated in the
    definition of sedentary work (and for the relatively few light
    jobs which are performed primarily in a seated position) or
    the prolonged standing or walking contemplated for most
    light work.” Id. Thus, the requirement, found by the ALJ,
    that Boone’s employment allow her the option to sit or
    stand at will every thirty minutes precludes her from
    performing “the prolonged sitting contemplated in the
    definition of sedentary work” as well as “most light work.”
    Id. Moreover, “Unskilled types of jobs are particularly
    structured so that a person cannot ordinarily sit or stand
    at will.” Id. (“There are some jobs in the national economy
    — typically professional and managerial ones — in which a
    person can sit or stand with a degree of choice.”). The
    sedentary and light jobs that Boone physically can perform
    are, therefore, likely to require a higher degree of skill than
    she is capable of. Id.; see also 
    20 C.F.R. § 416.963
    (d) (“If
    [the claimant is] closely approaching advanced age (age 50-
    54), [the Commissioner] will consider that [her] age along
    with a severe impairment(s) and limited work experience
    may seriously affect [her] ability to adjust to other work.”).
    Moreover, Boone’s inability to perform repetitive hand
    movements will further limit the number of unskilled
    sedentary jobs she can perform. See SSR 83-14 (“[B]ilateral
    manual dexterity is necessary for the performance of
    substantially all unskilled sedentary occupations.”).
    Given that SSR 83-12 suggests that Boone cannot
    perform most sedentary or light jobs (because of her need
    to have the option to sit or stand at will and her ability to
    perform only unskilled work), we cannot — as the
    Commissioner would have us do — assume that the ALJ’s
    finding that Boone can perform a limited range of light
    14
    work means that she can perform a significant number of
    jobs in the economy. Substantial evidence therefore does
    not support the ALJ’s conclusion that the Commissioner
    met her burden of proof.
    CONCLUSION
    The VE’s testimony does not constitute substantial
    evidence that Boone can perform a significant number of
    jobs that exist in the economy, and the record does not
    otherwise contain that evidence. Substantial evidence
    therefore does not support the Commissioner’s conclusion
    that Boone is not disabled and so not entitled to SSI
    disability benefits. Thus, we reverse the District Court’s
    entry of summary judgment in favor the Commissioner.18
    We remand to the District Court with instructions to return
    the case to the Commissioner for further proceedings,
    which may include the taking of additional evidence.19
    A True Copy:
    Teste:
    Clerk of the United States Court of Appeals
    for the Third Circuit
    18. We do not reverse the District Court’s denial of summary judgment
    to Boone.
    19. Because we remand on other grounds, we do not address Boone’s
    additional arguments that the ALJ gave insufficient weight to the opinion
    of her treating physician and that the ALJ erred in his evaluation of
    Boone’s credibility.