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MEMORANDUM

Nina Matrunich appeals the district court’s grant of summary judgment to the Commissioner of Social Security and denying Matrunich’s application for supplemental security income under Title XVI of the Social Security Act. We have jurisdiction pursuant to 28 U.S.C. § 1291 , and we affirm.

Matrunich asserts that the ALJ: (1) erred by failing to find Matrunich’s knee arthritis severe at step two of the evaluation process; (2) erred in not considering knee arthritis in formulating the residual functional capacity determination; (8) erred in rejecting the opinion of Arnold Greenberg, M.D., the treating physician; and (4) erred in finding that Matrunich could still perform light residual functional capacity. We disagree.

1. Substantial evidence supports the ALJ’s determination that Matrunich’s knee arthritis was not severe. See 20 C.F.R. §§ 404.1520 (c), 404.1521(a). The x-ray and medical evidence did not reveal an impairment that significantly limited Ma-trunich’s ability to do basic work activities.

2. Even if we were to hold that the ALJ committed legal error by finding that the knee pain was not severe, it was harmless. See Lewis v. Astrue, 498 F.3d 909, 911 (9th…