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Syllabus
from HMOs generally, so that reviewing Carle's decision under a fiduciary standard would not open the door to claims against other HMOs. However, inducement to ration care is the very point of any HMO scheme, and rationing necessarily raises some risks while reducing others. Thus, any legal principle purporting to draw a line between good and bad HMOs would embody a judgment about socially acceptable medical risk that would turn on facts not readily accessible to courts and on social judgments not wisely required of courts unless resort cannot be had to the legislature. Because courts are not in a position to derive a sound legal principle to differentiate an HMO like Carle from other HMOs, this Court assumes that the decisions listed in Herdrich's count cannot be subject to a claim under fiduciary standards unless all such decisions by all HMOs acting through their physicians are judged by the same standards and subject to the same claims. Pp. 218-222.
(b) Under ERISA, a fiduciary is someone acting in the capacity of manager, administrator, or financial adviser to a "plan," and Herdrich's count accordingly charged Carle with a breach of fiduciary duty in discharging its obligations under State Farm's medical plan. The common understanding of "plan" is a scheme decided upon in advance. Here the scheme comprises a set of rules defining a beneficiary's rights and providing for their enforcement. When employers contract with an HMO to provide benefits to employees subject to ERISA, their agreement may, as here, provide elements of a plan by setting out the rules under which beneficiaries will be entitled to care. ERISA's provision that fiduciaries shall discharge their duties with respect to a plan "solely in the interest of the participants and beneficiaries," 29 U. S. C. � 1104(a)(1), is rooted in the common law of trusts, but an ERISA fiduciary may also have financial interests adverse to beneficiaries. Thus, in every case charging breach of ERISA fiduciary duty, the threshold question is not whether the actions of some person providing services under the plan adversely affected a beneficiary's interest, but whether that person was performing a fiduciary function when taking the action subject to complaint. Pp. 222-226.
(c) Herdrich claims that Carle became a fiduciary, acting through its physicians, when it contracted with State Farm. It then breached its duty to act solely in the beneficiaries' interest, making decisions affecting medical treatment while influenced by a scheme under which the physician owners ultimately profited from their own choices to minimize the medical services provided. Herdrich's count lists mixed eligibility and treatment decisions: decisions relying on medical judgments in order to make plan coverage determinations. Pp. 226-230.
(d) Congress did not intend an HMO to be treated as a fiduciary to the extent that it makes mixed eligibility decisions acting through its
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