The chief executives of Aetna Inc. and Anthem Inc. defended their planned deals before a Senate subcommittee, facing sharply critical testimony that raised questions about the impact of health-insurance consolidation.
Aetna is seeking to acquire Humana Inc., in a $34 billion transaction focused largely on the private Medicare plans known as Medicare Advantage. Anthem is aiming to take over Cigna Corp. in a $48 billion deal. The two mergers together would have the effect of shrinking the top five health insurers to a big...
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