Recently, the Sixth Circuit issued a significant ERISA preemption ruling for employers and pharmacy benefit managers (PBMs). The court held that Tennessee’s PBM laws, which require “any willing” pharmacy access and limiting incentives that steer members to plan‑favored pharmacies, are preempted as applied to self‑funded ERISA plans. The ruling draws a clear line between permissible PBM cost regulation and impermissible interference with plan design and administration.








