Also in the news: Merck prepares to close its manufacturing plant in Pennsylvania; Optum Rx, which includes UnitedHealth Group, has dropped the reauthorization requirements for 80 drugs; and more.

America’s Health Insurance Plans, once a powerful lobbying force, has lost big-name members UnitedHealth Group, Aetna and Humana over the past few years. Marilyn Tavenner took the helm in 2015 and is ...