MEMORANDUM AND ORDER
John W. Lungstrum United States District Judge
Plaintiff seeks review of a decision of the Commissioner of Social Security (hereinafter Commissioner) denying Social Security Disability (SSD) benefits and Supplemental Security Income (SSI) benefits under sections 216(i), 223, 1602, and 1614(a)(3)(A) of the Social Security Act. 42 U.S.C. §§ 416(i), 423, 1381a, and 1382c(a)(3)(A) (hereinafter the Act). Finding the Commissioner’s evaluation of Listing 12.05C unreviewable, the court ORDERS that the decision shall be REVERSED and that judgment shall be entered pursuant to the fourth sentence of 42 U.S.C. § 405(g) REMANDING the case for further proceedings consistent with this opinion.
Plaintiff applied for SSD and SSI benefits alleging disability beginning July 20, 1965. (R. 24, 146-60). In due course, Plaintiff exhausted proceedings before the Commissioner, and now seeks judicial review of the final decision denying benefits. He alleges that the Administrative Law Judge (ALJ) erred in evaluating Listing 12.05C at step three of the Commissioner’s five-step sequential evaluation process, that Plaintiff does not possess the reading and writing skills necessary to perform the jobs identified by the vocational expert, and that the ALJ failed to obtain an explanation for alleged conflicts between the vocational expert’s testimony and the Dictionary of Occupational Titles (DOT).
The court’s review is guided by the Act. Wall v. Astrue, 561 F.3d 1048, 1052 (10th Cir. 2009). Section 405(g) of the Act provides that in judicial review “[t]he findings of the Commissioner as to any fact, if supported by substantial evidence, shall be conclusive.” 42 U.S.C. § 405(g). The court must determine whether the ALJ’s factual findings are supported by substantial evidence in the record and whether he applied the correct legal standard. Lax v. Astrue, 489 F.3d 1080, 1084 (10th Cir. 2007); accord, White v. Barnhart, 287 F.3d 903, 905 (10th Cir. 2001). Substantial evidence is more than a scintilla, but it is less than a preponderance; it is such evidence as a reasonable mind might accept to support a conclusion. Richardson v. Perales, 402 U.S. 389, 401 (1971); Wall, 561 F.3d at 1052; Gossett v. Bowen, 862 F.2d 802, 804 (10th Cir. 1988).
The court may “neither reweigh the evidence nor substitute [its] judgment for that of the agency.” Bowman v. Astrue, 511 F.3d 1270, 1272 (10th Cir. 2008) (quoting Casias v. Sec’y of Health & Human Servs., 933 F.2d 799, 800 (10th Cir. 1991)); accord, Hackett v. Barnhart, 395 F.3d 1168, 1172 (10th Cir. 2005). Nonetheless, the determination whether substantial evidence supports the Commissioner’s decision is not simply a quantitative exercise, for evidence is not substantial if it is overwhelmed by other evidence or if it constitutes mere conclusion. Gossett, 862 F.2d at 804-05; Ray v. Bowen, 865 F.2d 222, 224 (10th Cir. 1989).
The Commissioner uses the familiar five-step sequential process to evaluate a claim for disability. 20 C.F.R. §§ 404.1520, 416.920; Wilson v. Astrue, 602 F.3d 1136, 1139 (10th Cir. 2010) (citing Williams v. Bowen, 844 F.2d 748, 750 (10th Cir. 1988)). “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.” Wilson, 602 F.3d at 1139 (quoting Lax, 489 F.3d at 1084). In the first three steps, the Commissioner determines whether claimant has engaged in substantial gainful activity since the alleged onset, whether she has a severe impairment(s), and whether the severity of her impairment(s) meets or equals the severity of any impairment in the Listing of Impairments (20 C.F.R., Pt. 404, Subpt. P, App. 1). Williams, 844 F.2d at 750-51. After evaluating step three, the Commissioner assesses claimant’s RFC. 20 C.F.R. § 404.1520(e). This assessment is used at both step four and step five of the sequential evaluation process. Id.
The Commissioner next evaluates steps four and five of the sequential process--determining at step four whether, in light of the RFC assessed, claimant can perform her past relevant work; and at step five whether, when also considering the vocational factors of age, education, and work experience, claimant is able to perform other work in the economy. Wilson, 602 F.3d at 1139 (quoting Lax, 489 F.3d at 1084). In steps one through four the burden is on Plaintiff to prove a disability that prevents performance of past relevant work. Blea v. Barnhart, 466 F.3d 903, 907 (10th Cir. 2006); accord, Dikeman v. Halter, 245 F.3d 1182, 1184 (10th Cir. 2001); Williams, 844 F.2d at 751 n.2. At step five, the burden shifts to the Commissioner to show that there are jobs in the economy which are within the RFC assessed. Id.; Haddock v. Apfel, 196 F.3d 1084, 1088 (10th Cir. 1999).
Remand is necessary because the evaluation whether Plaintiff’s condition meets or equals the severity of Listing 12.05C is unreviewable by the court. Because the case must be remanded, Plaintiff may present his arguments regarding the vocational expert’s testimony to the Commissioner on remand.
II. Listing 12.05C
At the hearing, Plaintiff’s attorney presented his theory of the case, arguing that Plaintiff’s condition meets Listing 12.05C for mental retardation because he had undergone psychological testing which produced IQ scores of which the lowest score was 70, and that Plaintiff “has a life long problem with a learning disorder, with extremely low cognitive, very low cognitive functioning.” (R. 42).
A. Applicable Legal Standard
The “Listing of Impairments” describes the severity of certain impairments that the Commissioner considers disabling. 20 C.F.R. §§ 404.1525(a), 416.925(a); see also, 20 C.F.R., Pt. 404, Subpt. P, App. 1. If plaintiff’s condition meets or medically equals the severity of a listed impairment, his impairment is conclusively presumed disabling. Williams, 844 F.2d at 751; see Bowen v. Yuckert, 482 U.S. 137, 141 (1987) (if impairment “meets or equals one of the listed impairments, the claimant is conclusively presumed to be disabled”). However, plaintiff “has the burden at step three of demonstrating, through medical evidence, that his impairments ‘meet all of the specified medical criteria’ contained in a particular listing.” Riddle v. Halter, No. 00-7043, 2001 WL 282344 at *1 (10th Cir. Mar. 22, 2001) (quoting Sullivan v. Zebley, 493 U.S. 521, 530 (1990) (emphasis in Zebley)).
“The [Commissioner] explicitly has set the medical criteria defining the listed impairments at a higher level of severity than the statutory standard. The listings define impairments that would prevent an adult, regardless of his age, education, or work experience, from performing any gainful activity, not just ‘substantial gainful activity.’” Zebley, 493 U.S. at 532-33 (emphasis in original) (citing 20 C.F.R. § 416.925(a) (1989)). The listings “streamlin[e] the decision process by identifying those claimants whose medical impairments are so severe that it is likely they would be found disabled regardless of their vocational background.” Yuckert, 482 U.S. at 153. ...