Fiduciary Duty (Health Plan)

Under ERISA, a fiduciary is any person or entity that exercises discretionary authority or control over the management of an employee benefit plan or its assets. For a self-funded health plan, the plan sponsor (the employer) is typically the named fiduciary, and so is the plan administrator — which may be the employer itself, a TPA, or a committee of HR and finance executives. Being a fiduciary isn't a title you opt into; it's a legal status that attaches to the function you perform.

ERISA's fiduciary standard requires plan fiduciaries to act solely in the interest of plan participants and beneficiaries, defray reasonable plan expenses, follow the plan documents, and act with the care, skill, prudence, and diligence of a prudent expert in the same circumstances. The "prudent expert" standard is higher than the common "prudent person" standard — it means fiduciaries are held to the knowledge level of a sophisticated benefits professional, not just a reasonable person. This matters in practical terms: an employer who approves a PBM contract without understanding the spread pricing and rebate arrangements, or who doesn't periodically benchmark their TPA fees against market rates, can be found to have breached their fiduciary duty even if they acted in good faith. Personal liability is real — ERISA allows personal liability of individual fiduciaries for losses caused by breaches. The Consolidated Appropriations Act significantly raised the bar by requiring plan sponsors to document their fiduciary process for selecting service providers and to attest to gag-clause compliance annually.

The takeaway: if you're an HR or finance executive at a self-funded employer, you are likely an ERISA fiduciary whether you know it or not. Document your decision-making process for plan design, vendor selection, and fee benchmarking. An undocumented decision is an indefensible one if a participant sues or the DOL audits.