MEMORANDUM & ORDER
John W. Lungstrum, United States District Judge
Plaintiff Renee Vandergrift brings this action pursuant to 42 U.S.C. § 405(g) seeking judicial review of the decision of defendant, the Commissioner of Social Security, to deny her application for social security disability insurance benefits under Title II of the Social Security Act. According to plaintiff, defendant erred by characterizing plaintiff’s migraine headaches as “non-severe, ” improperly applying the “grid rules” and failing to make a finding as to the actual erosion of the light vocational base, and failing to properly assess plaintiff’s residual functional capacity. As explained in more detail below, the court rejects plaintiff’s argument and affirms defendant’s decision.
I. Procedural Background
On June 18, 2009, plaintiff protectively filed an application for disability insurance benefits, alleging disability beginning March 1, 2007. The application was denied both initially and upon reconsideration. At plaintiff’s request, an administrative law judge (“ALJ”) held a hearing on September 15, 2010, at which both plaintiff and her non-attorney representative were present. A vocational expert was not present at the hearing, but submitted written responses to interrogatories after the hearing, which were then shared with plaintiff’s representative. Plaintiff’s representative then requested a supplemental hearing which was held on July 6, 2011. The vocational expert and plaintiff’s representative appeared at the supplemental hearing. Plaintiff did not appear due to illness and, through her representative, she waived her right to appear at the supplemental hearing.
On September 21, 2011, the ALJ rendered a decision in which he determined that plaintiff was not under a “disability” as defined by the Social Security Act from March 1, 2007 through the date of the decision. Consequently, the ALJ denied all benefits to plaintiff. After the ALJ’s unfavorable decision, plaintiff requested review by the Appeals Council. The Appeals Council denied plaintiff’s request for review, rendering the ALJ’s decision the final decision of defendant.
II. Standard of Review
Judicial review under 42 U.S.C. § 405(g) is limited to whether defendant’s decision is supported by substantial evidence in the record as a whole and whether defendant applied the correct legal standards. See Wells v. Colvin, 727 F.3d 1061, 1067 (10th Cir. 2013) (citing Wilson v. Astrue, 602 F.3d 1136, 1140 (10th Cir. 2010)). The Tenth Circuit has defined “substantial evidence” as “such relevant evidence as a reasonable mind might accept as adequate to support a conclusion.” Id. (quoting Wilson, 602 F.3d at 1140). In the course of its review, the court may not reweigh the evidence or substitute its judgment for that of defendant. Cowan v. Astrue, 552 F.3d 1182, 1185 (10th Cir. 2008).
III. Relevant Framework for Analyzing Claim of Disability and the ALJ’s Findings
A “disability” for purposes of the Social Security Act requires both the “inability to engage in any substantial gainful activity” and “a medically determinable physical or mental impairment which can be expected to result in death or which has lasted or can be expected to last for a continuous period of not less than 12 months.” Bussell v. Astrue, 463 Fed.Appx. 779, 781 (10th Cir. 2012) (quoting 42 U.S.C. § 423(d)(1)(A)). The Social Security Act further provides that an individual “shall be determined to be under a disability only if his physical or mental impairment or impairments are of such severity that he is not only unable to do his previous work but cannot, considering his age, education, and work experience, engage in any other kind of substantial gainful work which exists in the national economy.” Wilson, 602 F.3d at 1140 (quoting Barnhart v. Thomas, 540 U.S. 20, 21-22 (2003) (quoting 42 U.S.C. § 423(d)(2)(A), 1382c(a)(3)(B))).
The Social Security Administration has established a five-step sequential evaluation process for determining whether a claimant is disabled, see id. at 1139, and the ALJ in this case followed the five-step process. If a determination can be made at any of the steps that a claimant is or is not disabled, evaluation under a subsequent step is not necessary. Id. Step one requires the claimant to show that he or she is not presently engaged in substantial gainful activity. Id. Here, the ALJ determined that plaintiff was not engaged in substantial gainful activity and, thus, properly proceeded to the second step. The second step of the evaluation process involves a determination of whether “the claimant has a medically severe impairment or combination of impairments” that significantly limits his or her ability to perform basic work activities. Wall v. Astrue, 561 F.3d 1048, 1052 (10th Cir. 2009) (citing 20 C.F.R. § 404.1521). While the ALJ concluded that some of plaintiff’s asserted impairments were non-severe, including plaintiff’s alleged limitations from migraine headaches, the ALJ nonetheless concluded that plaintiff had several severe impairments for purposes of the regulations, including obesity; arthritis; degenerative disc disease of the lumbar spine; bilateral shoulder impingement syndrome; fibromyalgia; and major depressive disorder. Thus, the ALJ proceeded to step three.
In step three, the ALJ determines whether the impairment “is equivalent to one of a number of listed impairments that the Commissioner acknowledges are so severe as to preclude substantial gainful activity.” Best-Willie v. Colvin, 514 Fed.Appx. 728, 733 (10th Cir. 2013). “If the impairment is listed and thus conclusively presumed to be disabling, the claimant is entitled to benefits.” Id. If not, the evaluation proceeds to the fourth step, where the claimant must show that the “impairment or combination of impairments prevents him from performing his [or her] past work.” Wilson, 602 F.3d at 1139 (quoting Lax v. Astrue, 489 F.3d 1080, 1084 (10th Cir. 2007)). With respect to the third step of the process in this case, the ALJ determined that plaintiff’s impairments were not listed or medically equivalent to those listed in the relevant regulations.
At the fourth step, the ALJ determined that plaintiff retained the residual functional capacity (RFC) for light work as defined in 20 C.F.R. §§ 404.1567(b) to include lifting or carrying up to twenty pounds occasionally or ten pounds frequently; standing or walking about six hours out of an eight hour workday; and sitting six hours out of an eight hour workday; except that plaintiff must be afforded the option to sit for thirty minutes then stand for thirty minutes as needed. The ALJ further concluded that plaintiff was limited to occasional postural maneuvers such as stooping, kneeling, crouching, crawling and climbing ramps or stairs; must avoid climbing ladders, ropes or scaffolds; limited to occasional overheard reaching with the right, dominant upper extremity; and should avoid concentrated exposure to cold temperature extremes and vibration. Finally, the ALJ concluded that plaintiff was able to perform occupations that do not require exposure to dangerous machinery or unprotected heights and that she was able to perform simple, routine, repetitive tasks. Based on evidence adduced from the vocational expert, the ALJ concluded that plaintiff, with those limitations, could not perform her past relevant work as a telephone order clerk, sales clerk or cashier-checker.
Thus, the ALJ proceeded to the fifth and final step of the sequential evaluation process– determining whether the claimant has the residual functional capacity “to perform work in the national economy, given her age, education, and work experience.” See id. (quoting Lax, 489 F.3d at 1084). At that point, the ALJ properly shifted the burden of proof to defendant to establish that plaintiff retains a sufficient capacity to perform an alternative work activity and that there are sufficient jobs in the national economy for a hypothetical person with the claimant’s impairments. Raymond v. Astrue, 621 F.3d 1269, 1274 (10th Cir. 2009). At this step, the ALJ concluded that plaintiff was not disabled, a conclusion that rested on a finding ...