Cite as: 538 U. S. 822 (2003)
Syllabus
of Appeals as a means to control disability determinations by administrative law judges under the Social Security Act. In 1991, the Commissioner of Social Security adopted regulations approving and formalizing use of the rule in the Social Security disability program. Nothing in ERISA or the Secretary of Labor's ERISA regulations, however, suggests that plan administrators must accord special deference to the opinions of treating physicians, or imposes a heightened burden of explanation on administrators when they reject a treating physician's opinion. If the Secretary found it meet to adopt a treating physician rule by regulation, courts would examine that determination with appropriate deference. See Chevron U. S. A. Inc. v. Natural Resources Defense Council, Inc., 467 U. S. 837. But the Secretary has not chosen that course and an amicus brief reflecting the Department of Labor's position opposes adoption of such a rule for disability determinations under plans covered by ERISA. Whether a treating physician rule would increase the accuracy of ERISA disability determinations, as the Ninth Circuit believed it would, is a question that the Legislature or superintending administrative agency is best positioned to address. Finally, and of prime importance, critical differences between the Social Security disability program and ERISA benefit plans caution against importing a treating physician rule from the former area into the latter. By accepting and codifying such a rule, the Social Security Commissioner sought to serve the need for efficient administration of an obligatory nationwide benefits program. In contrast, nothing in ERISA requires employers to establish employee benefits plans or mandates what kind of benefits employers must provide if they choose to have such a plan. Lockheed Corp. v. Spink, 517 U. S. 882, 887. Rather, employers have large leeway to design disability and other welfare plans as they see fit. In determining entitlement to Social Security benefits, the adjudicator measures the claimant's condition against a uniform set of federal criteria. The validity of a claim to benefits under an ERISA plan, on the other hand, is likely to turn, in large part, on the interpretation of terms in the plan at issue. Firestone Tire & Rubber Co. v. Bruch, 489 U. S. 101, 115. Deference is due the Labor Secretary's stated view that ERISA is best served by preserving the greatest flexibility possible for operating claims processing systems consistent with a plan's prudent administration. Plan administrators may not arbitrarily refuse to credit a claimant's reliable evidence, including the opinions of a treating physician. But courts have no warrant to require administrators automatically to accord special weight to the opinions of a claimant's phy-
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