CMS finalizes rule prohibiting adult dental benefits as an essential health benefit in Marketplace Exchanges May 21, 2026 CMS finalized Marketplace Exchange policies affecting dental coverage in the 2027 Notice of Benefit and Payment Parameters Final Rule. https://adanews.ada.org/ada-news/2026/may/cms-finalizes-rule-prohibiting-adult-dental-benefits-as-an-essential-health-benefit-in-marketplace-exchanges/