In August, Aetna announced it was significantly paring down its exchange offerings in 2017, citing overwhelming financial losses within the market over the first three years. Aetna CEO Mark Bertolini told attendees at Bloomberg's The Year Ahead Summit that the insurer wasn't ruling out a return to the ACA marketplaces, but that it was waiting for legislative changes that would offer insurers more support for covering a sicker patient population. Given the divisiveness within Congress over the ACA, and the slow process of implementing new regulations, Bertolini said re-entering the exchanges wasn't likely until "2019, maybe 2020."