Healthcare providers, insurers supersize

Five years after the Affordable Care Act helped set off a health-care merger frenzy, the pace of consolidation is accelerating, transforming the medical marketplace into a land of giants. The trend is under a new spotlight now, as Congress zeroes in on the competitive and cost impact of proposed deals that would collapse the health-insurance industry's top five players into just three massive companies, each with more than $100 billion in annual revenue. On Tuesday, a Senate subcommittee is set to hear testimony from the chief executives of Aetna Inc., which plans to acquire Humana Inc., and Anthem Inc., which is seeking to buy Cigna Corp. , as well as the head of the American Hospital Association. [Subscription Required]