Aetna to sell Medicare drug plans as part of CVS deal

By the numbers: Aetna has 2.2 million members in standalone Medicare Part D drug plans. A combined CVS-Aetna would have more than 8 million Medicare drug members, or close to one-third of the market based on the latest federal data. The Part D overlap has been viewed as an antitrust concern since the deal was first announced.

• While Aetna's divestiture likely leads to federal approval, consumer advocates say they are still worried about whether CVS will impede competition with its health insurance and pharmacy benefits management under one roof, and whether CVS will force other insurers to drive business toward its own retail stores and pharmacies.