Holding: An employee health plan often has an administrator who must interpret its terms, and in some circumstances courts will defer to the administrator's reading. The Court held here that a plan administrator's interpretation is entitled to deference, even when the administrator had previously adopted a different interpretation that a court found erroneous.
Judgment: Reversed and remanded, 5-3, in an opinion by Chief Justice John Roberts on April 21, 2010. Justice Breyer dissented, joined by Justices Stevens and Ginsburg. Justice Sotomayor took no part in the decision.