The opinion of the court was delivered by: Craig M. Kellison United States Magistrate Judge
MEMORANDUM OPINION AND ORDER
Plaintiff, who is proceeding with retained counsel, brings this action under 42 U.S.C. § 405(g) for judicial review of a final decision of the Commissioner of Social Security. Pursuant to the written consent of all parties, this case is before the undersigned as the presiding judge for all purposes, including entry of final judgment. See 28 U.S.C. § 636(c). Pending before the court are plaintiff's motion for summary judgment (Doc. 20) and defendant's cross-motion for summary judgment (Doc. 21).
Plaintiff applied for social security benefits on June 12, 2009. In the application, plaintiff claims that disability began on July 1, 2005. Plaintiff claims that disability is caused by a combination of degenerative disc disease of the cervical and lumbar spine, degenerative joint disease in the knees, bilateral carpal tunnel syndrome, major depression, and morbid obesity. Plaintiff's claim was initially denied. Following denial of reconsideration, plaintiff requested an administrative hearing, which was held on December 1, 2010, before Administrative Law Judge ("ALJ") Jean R. Kerins. In a January 26, 2011, decision, the ALJ concluded that plaintiff is not disabled based on the following relevant findings:
1. The claimant has the following severe impairment(s): poly-substance dependence in early remission, depression, and obesity;
2. The claimant does not have an impairment or combination of impairments that meets or medically equals an impairment listed in the regulations;
3. The claimant has the following residual functional capacity: full range of medium work;
4. Considering the claimant's age, education, work experience, residual functional capacity, and the Medical-Vocational Guidelines, there are jobs that exist in significant numbers in the national economy that the claimant can perform.
After the Appeals Council declined review on August 31, 2011, this appeal followed.
The court reviews the Commissioner's final decision to determine whether it is:
(1) based on proper legal standards; and (2) supported by substantial evidence in the record as a whole. See Tackett v. Apfel, 180 F.3d 1094, 1097 (9th Cir. 1999). "Substantial evidence" is more than a mere scintilla, but less than a preponderance. See Saelee v. Chater, 94 F.3d 520, 521 (9th Cir. 1996). It is ". . . such evidence as a reasonable mind might accept as adequate to support a conclusion." Richardson v. Perales, 402 U.S. 389, 402 (1971). The record as a whole, including both the evidence that supports and detracts from the Commissioner's conclusion, must be considered and weighed. See Howard v. Heckler, 782 F.2d 1484, 1487 (9th Cir. 1986); Jones v. Heckler, 760 F.2d 993, 995 (9th Cir. 1985). The court may not affirm the Commissioner's decision simply by isolating a specific quantum of supporting evidence. See Hammock v. Bowen, 879 F.2d 498, 501 (9th Cir. 1989). If substantial evidence supports the administrative findings, or if there is conflicting evidence supporting a particular finding, the finding of the Commissioner is conclusive. See Sprague v. Bowen, 812 F.2d 1226, 1229-30 (9th Cir. 1987). Therefore, where the evidence is susceptible to more than one rational interpretation, one of which supports the Commissioner's decision, the decision must be affirmed, see Thomas v. Barnhart, 278 F.3d 947, 954 (9th Cir. 2002), and may be set aside only if an improper legal standard was applied in weighing the evidence, see Burkhart v. Bowen, 856 F.2d 1335, 1338 (9th Cir. 1988).
In his motion for summary judgment, plaintiff argues: (1) the ALJ failed to fulfill her duty to develop the record by ordering a physical consultative examination; (2) the ALJ failed to properly evaluate the impact of his obesity; (3) the ALJ failed to provide clear and convincing reasons for rejecting plaintiff's testimony as not credible; and (4) the ALJ erred by applying the Medical-Vocational Guidelines due to the existence of non-exertional limitations.
A. Duty to Develop the Record
The ALJ has an independent duty to fully and fairly develop the record and assure that the claimant's interests are considered. See Tonapetyan v. Halter, 242 F.3d 1144, 1150 (9th Cir. 2001). When the claimant is not represented by counsel, this duty requires the ALJ to be especially diligent in seeking all relevant facts. See id. This requires the ALJ to "scrupulously and conscientiously probe into, inquire of, and explore for all the relevant facts." Cox v. Califano, 587 F.2d 988, 991 (9th Cir. 1978). Ambiguous evidence or the ALJ's own finding that the record is inadequate triggers this duty. See Tonapetyan, 242 F.3d at 1150. The ALJ may discharge the duty to develop the record by subpoenaing the claimant's physicians, submitting questions to the claimant's physicians, continuing the hearing, or keeping the record open after the hearing to allow for supplementation of the record. See id. (citing Tidwell v. Apfel, 161 F.3d 599, 602 (9th Cir. 1998)).
Plaintiff argues that, given his obesity and related problems noted by doctors, and the lack of any physical residual functional capacity assessment by a treating, examining, or non-examining consultative source, the ALJ erred by not ordering a physical consultative examination to determine plaintiff's physical residual functional capacity.*fn1 At the outset, the court observes that, contrary to plaintiff's assertion, the record contains a case evaluation analyses performed by agency consultative doctor B. Sheehy, M.D., who concluded that plaintiff's symptoms are non-severe. Giving plaintiff the benefit of any doubts, the ALJ gave this conclusion little weight because ". . .evidence received at the hearing level shows that the claimant is more ...