The opinion of the court was delivered by: Andrew J. Wistrich United States Magistrate Judge
Plaintiff filed this action seeking reversal of the decision of defendant, the Acting Commissioner of the Social Security Administration (the "Commissioner"), denying plaintiff's applications for disability insurance benefits. The parties have filed a Joint Stipulation ("JS") setting forth their contentions with respect to each disputed issue.
The parties are familiar with the procedural facts, which are summarized in the Joint Stipulation. [See JS 2-3]. Plaintiff alleged that she became disabled on June 19, 2008 due to chronic pain, numbness, and weakness in her back and extremities, blurred vision, anemia, dizziness, headaches, and diabetes mellitus. [Administrative Record ("AR") 62, 239, 272, 281, 306]. In an August 24, 2010 written hearing decision that constitutes the Commissioner's final decision in this case, an administrative law judge (the "ALJ") found that plaintiff, then aged 57, had severe impairments consisting of degenerative arthritis in her right knee and diabetes mellitus. [AR 16, 239]. The ALJ found that plaintiff retained the residual functional capacity ("RFC") to perform a range of medium work, and that her RFC did not preclude performance of her past relevant work as a mail clerk and as a nurse's aide/unit clerk. [AR 20-21]. Therefore, the ALJ concluded that plaintiff was not disabled through the date of his decision. [AR 21].
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. Soc. 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 Soc. Sec. Admin., 169 F.3d 595, 599 (9th Cir.1999)).
Plaintiff contends that the ALJ failed properly to assess the effects of plaintiff's obesity on her ability to work. [See JS 4-8].
Plaintiff's medical records indicate that she was five feet, two inches tall, and that during the period from June 2008 through May 2010, she weighed between 160 pounds and 179 pounds. [AR 827, 830, 855, 871-872, 876-877, 895, 923, 952-955, 963]. During that period, plaintiff's Body Mass Index ("BMI") ranged from a low of 29.3, in the "overweight" category, to a high of 32.7, in the "obese" category. See National Institutes of Health, National Heart, Lung, and Blood Institute, Body Mass Index Calculator, available at http://www.nhlbi.nih.gov/guidelines/obesity/BMI/bmicalc.htm (last accessed May 7, 2013); see also SSR 02-01p, 2000 WL 628049, at *2 (relying on the National Institutes of Health criteria and BMI calculator to determine whether an individual is obese).
The ALJ found that plaintiff had severe impairments consisting of degenerative arthritis of the right knee and diabetes mellitus. [AR16-17]. He did not refer to or discuss plaintiff's weight, nor did he make any finding as to whether or not she was obese or had any obesity-related functional limitations, alone or in combination with her other severe impairments.
The ALJ has a duty to determine the effect of a disability claimant's "obesity upon her other impairments, and its effect on her ability to work and general health," even where the claimant's obesity was not independently "severe" and was not explicitly alleged to be a "disabling factor." Celaya v. Halter, 332 F.3d 1177, 1182 (9th Cir. 2003) (reversing and remanding for a "multiple impairment analysis that explicitly accounts for the direct and marginal effects of the plaintiff's obesity during the period in question and that culminates in reviewable, on-the-record findings"); see SSR 02-01p, 2000 WL 628049, at *3-*7 (directing adjudicators to consider the effects of obesity in all steps of the five-step sequential evaluation). The Ninth Circuit held that the ALJ erred in not inquiring into the "interactive effects" of the claimant's obesity and her severe impairments of hypertension and diabetes for three reasons:
First, it was raised implicitly in [the claimant's] report of symptoms. Second, it was clear from the record that [her] obesity was at least close to the listing criterion, and was a condition that could exacerbate her reported illnesses. Third, in light of [the claimant's] pro se status, the ALJ's observation of [the claimant] and the information on the record should have alerted him to the need to develop the record in respect to her obesity.
Celaya, 332 F.3d at 1182.
After the Ninth Circuit decided Celaya, the Commissioner deleted obesity from the listing of impairments, but instructed adjudicators to consider whether obesity, alone or combined with other impairments, causes or exacerbates a claimant's functional limitations. See 20 C.F.R. Part 404, Subpart P, Appendix 1, ¶¶ 1.00Q, 3.00I & 4.00I (directing adjudicators to "consider any additional and cumulative effects of obesity" because obesity is "a medically determinable impairment often associated with" musculoskeletal, respiratory or cardiovascular impairments that "can be a major cause of disability in individuals with obesity," and stating that the combined effects of obesity with other impairments may be greater than expected without obesity); SSR 02-1p, 2000 WL 628049, at *3, *5 (stating that obesity is "a risk factor that increases an individual's chances of developing impairments in most body systems" and "may increase the severity of ...