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In a new study to be released on Tuesday, the American Medical Association says that most insurance markets in the United States are dominated by a few companies and would become even more concentrated with a plan by Anthem to acquire Cigna and a proposal by Aetna to buy Humana. The American Hospital Association raised similar concerns last week in a letter to the Justice Department that said the proposed Aetna-Humana deal “threatens serious and widespread competitive harm” to Medicare beneficiaries because it would reduce options in the market for private Medicare Advantage plans. (Pear, 9/8)

The CEO who pulled off the first major insurance company merger agreement of the summer also achieved what many executives might think impossible: He raised his company's minimum wage, announced plans to up its contribution to workers' health care and watched the stock soar by nearly 30% since January. But Aetna's Mark Bertolini is used to defying expectations. (O'Donnell, 9/7)