The opinion of the court was delivered by: Suzanne H. Segal United States Magistrate Judge
MEMORANDUM DECISION AND ORDER
Elizabeth Isagulyan ("Plaintiff") brings this action seeking to overturn the decision of the Commissioner of the Social Security Administration (hereinafter the "Commissioner" or the "Agency") denying her application for disability benefits. The parties consented, pursuant to 28 U.S.C. § 636(c), to the jurisdiction of the undersigned United States Magistrate Judge. For the reasons stated below, the decision of the Commissioner is REVERSED and REMANDED for further proceedings.
On July 11, 2007, Plaintiff filed an application for Disability Insurance Benefits ("DIB") and Supplemental Security Income ("SSI"), alleging a disability beginning December 21, 2006 due to back pain and leg pain. (Administrative Record "AR" 72, 96). The Agency denied her application on November 7, 2007. (AR 58-62). Plaintiff requested a hearing,*fn1 which was held before Administrative Law Judge ("ALJ") John Moreen on December 17, 2008. (AR 22-51). On February 26, 2009, the ALJ issued an unfavorable decision. (AR 10-21). Plaintiff subsequently sought review of the hearing decision, but the Appeals Council denied review on September 2, 2009. (AR 6-9). Plaintiff then filed the instant complaint on October 14, 2009.
III. THE FIVE-STEP SEQUENTIAL EVALUATION PROCESS
To qualify for disability benefits, a claimant must demonstrate a medically determinable physical or mental impairment that prevents him from engaging in substantial gainful activity and that is expected to result in death or to last for a continuous period of at least twelve months.*fn2 Reddick v. Chater, 157 F.3d 715, 721 (9th Cir. 1998) (citing 42 U.S.C. § 423(d)(1)(A)). The impairment must render the claimant incapable of performing the work he previously performed and incapable of performing any other substantial gainful employment that exists in the national economy. Tackett v. Apfel, 180 F.3d 1094, 1098 (9th Cir. 1999) (citing 42 U.S.C. § 423(d)(2)(A)).
To decide if a claimant is entitled to benefits, an ALJ conducts a five-step inquiry. 20 C.F.R. §§ 404.1520, 416.920. The steps are:
(1) Is the claimant presently engaged in substantial gainful activity? If so, the claimant is found not disabled. If not, proceed to step two.
(2) Is the claimant's impairment severe? If not, the claimant is found not disabled. If so, proceed to step three.
(3) Does the claimant's impairment meet or equal one of list of specific impairments described in 20 C.F.R. Part 404, Subpart P, Appendix 1? If so, the claimant is found disabled. If not, proceed to step four.
(4) Is the claimant capable of performing his past work? If so, the claimant is found not disabled. If not, proceed to step five.
(5) Is the claimant able to do any other work? If not, the claimant is found disabled. If so, the claimant is found not disabled.
Tackett, 180 F.3d at 1098-99; see also Bustamante v. Massanari, 262 F.3d 949, 953-54 (9th Cir. 2001) (citations omitted); 20 C.F.R. §§ 404.1520(b)-(g)(1) & 416.920(b)-(g)(1).
The claimant has the burden of proof at steps one through four, and the Commissioner has the burden of proof at step five. Bustamante, 262 F.3d at 953-54. If, at step four, the claimant meets his burden of establishing an inability to perform past work, the Commissioner must show that the claimant can perform some other work that exists in "significant numbers" in the national economy, taking into account the claimant's residual functional capacity ("RFC"), age, education, and work experience.*fn3 Tackett, 180 F.3d at 1098, 1100; Reddick, 157 F.3d at 721; 20 C.F.R. §§ 404.1520(g)(1), 416.920(g)(1). The Commissioner may do so by the testimony of a vocational expert ("VE") or by reference to the Medical-Vocational Guidelines appearing in 20 C.F.R. Part 404, Subpart P, Appendix 2 (commonly known as "the Grids"). Osenbrock v. Apfel, 240 F.3d 1157, 1162 (9th Cir. 2001). ...