MEMORANDUM OF DECISION
ANDREW J. WISTRICH, Magistrate Judge.
Plaintiff filed this action seeking reversal of the decision of defendant, the Commissioner of the Social Security Administration (the "Commissioner"), denying plaintiff's application for disability insurance benefits and supplemental security income ("SSI") benefits. The parties have filed a Joint Stipulation ("JS") setting forth their contentions with respect to each disputed issue.
Plaintiff, then aged 38, filed her applications for benefits on February 17, 2009, alleging that she had been disabled since January 15, 2008. [JS 3; Administrative Record ("AR") 61-62, 125]. In a written hearing decision that constitutes the Commissioner's final decision in this matter, an administrative law judge (the "ALJ") found that plaintiff had severe impairments consisting of seizure disorder, right shoulder osteoarthritis, and osteopenia, but that she retained the residual functional capacity ("RFC") to perform a reduced range of light work. [AR 20, 24]. Based on the testimony of a vocational expert, the ALJ concluded that plaintiff's RFC did not preclude her from performing her past relevant work as a cashier and a greeter. Therefore, the ALJ found plaintiff not disabled at any time through the date of her decision. [AR 27].
Standard of Review
The Commissioner's denial of benefits should be disturbed only if it is not supported by substantial evidence or is based on legal error. Stout v. Comm'r, Social Sec.Admin. , 454 F.3d 1050, 1054 (9th Cir. 2006); Thomas v. Barnhart , 278 F.3d 947, 954 (9th Cir. 2002). "Substantial evidence" means "more than a mere scintilla, but less than a preponderance." Bayliss v. Barnhart , 427 F.3d 1211, 1214 n.1 (9th Cir. 2005). "It is such relevant evidence as a reasonable mind might accept as adequate to support a conclusion." Burch v. Barnhart , 400 F.3d 676, 679 (9th Cir. 2005) (internal quotation marks omitted). The court is required to review the record as a whole and to consider evidence detracting from the decision as well as evidence supporting the decision. Robbins v. Social Sec. Admin , 466 F.3d 880, 882 (9th Cir. 2006); Verduzco v. Apfel , 188 F.3d 1087, 1089 (9th Cir. 1999). "Where the evidence is susceptible to more than one rational interpretation, one of which supports the ALJ's decision, the ALJ's conclusion must be upheld." Thomas , 278 F.3d at 954 (citing Morgan v. Comm'r of Social Sec. Admin. , 169 F.3d 595, 599 (9th Cir. 1999)).
Severity of plaintiff's mental impairment
Plaintiff contends that the ALJ erred in determining that her mental impairments of Bipolar II disorder, depressive disorder NOS, and chronic post traumatic stress disorder were nonsevere at step two of the sequential evaluation. [JS 11]. In determining the severity of plaintiff's mental impairment, the ALJ considered: (1) plaintiff's mental health treatment records; (2) plaintiff's testimony at the administrative hearing; (3) a February 10, 2010 mental health assessment completed by J. Eduardo Guzman, M.D., plaintiff's treating physician; (4) an April 12, 2011 mental health assessment completed by Dr. R. Morgan, M.D.; and (5) the consultative psychiatric examination report of Dr. G. Bartell, M.D. [AR 20-22].
"An impairment or combination of impairments may be found not severe only if the evidence establishes a slight abnormality that has no more than a minimal effect on an individual's ability to work." Webb v. Barnhart , 433 F.3d 683, 686 (9th Cir. 2006) (internal quotation marks omitted). To determine whether or not an impairment is severe, the ALJ must decide whether a claimant's impairment or combination of impairments significantly limits his or her physical or mental ability to do "basic work activities." 20 C.F.R. §§ 404.1521(a), 416.921(a); see Webb , 433 F.3d at 686-687. Basic work activities are the "abilities and aptitudes necessary to do most jobs, " such as (1) physical functions like walking, standing, sitting, lifting, pushing, pulling, reaching, carrying, and handling; (2) the capacity for seeing, hearing, speaking, understanding, carrying out, and remembering simple instructions; (3) the use of judgment; and (4) the ability to respond appropriately to supervision, co-workers, and usual work situations. 20 C.F.R. § § 404.1521(b), 416.921(b).
The lack of a severe impairment must be "clearly established by medical evidence." Webb , 433 F.3d at 687 (quoting SSR 85-28). The ALJ is required to consider the claimant's subjective symptoms in making a severity determination, provided that the claimant "first establishes by objective medical evidence (i.e., signs and laboratory findings) that he or she has a medically determinable physical or mental impairment(s) and that the impairment(s) could reasonably be expected to produce the alleged symptom(s)." SSR 96-3p, 1996 WL 374181, at *2.
The ALJ concluded that the treatment evidence failed to establish the presence of a severe mental impairment. In finding plaintiff's mental impairments nonsevere, the ALJ noted that plaintiff had been hospitalized in November 2008 after a suicide attempt and was diagnosed with major depressive disorder, recurrent. [AR 21]. The ALJ also noted that plaintiff was in therapy from approximately June 2009 to May 2010. During that period, she was diagnosed with post traumatic stress disorder, generalized anxiety disorder, and major depressive disorder, and she was prescribed Zoloft. [AR 21]. The ALJ concluded that although plaintiff complained of anxiety and depression on various occasions, her mental status examinations were generally "within normal limits, " and she reported that the Zoloft was helping and that her mood was improving. [AR 21]
The step two inquiry is "a de minimis screening device [used] to dispose of groundless claims, ' and an ALJ may find that a claimant lacks a medically severe impairment or combination of impairments only when [that] conclusion is clearly established by medical evidence.'" Webb , 433 F.3d at 687 (quoting Smolen v. Chater , 80 F.3d 1273, 1290 (9th Cir.1996) and SSR 85-28)).
The medical evidence in this case does not "clearly establish" the absence of a severe mental impairment. The ALJ selectively highlighted those portions of plaintiff's mental health records that supported the ALJ's conclusion that plaintiff's mental impairments were nonsevere, while downplaying or omitting evidence to the contrary. For example, the ALJ stated that plaintiff's mental status evaluation on January 30, 2009 was largely within normal limits. [AR 21]. However, the ALJ failed to note that the same records also reveal that: (1) plaintiff had recently been discharged from the hospital after a suicide attempt; (2) although her medication was helping, plaintiff was still suffering from severe ...