Michael Chernew, a prominent scholar in the field of health economics, is returning to the Medicare Payment Advisory Commission as its new chairman. Betty Rambur, a professor of nursing, and Wayne Riley, the president of a New York City medical center, are also joining MedPAC as new members. The appointments of Chernew, Rambur and Riley were announced Thursday (May 21) by the Government Accountability Office, which selects the members of the commission to serve staggered three-year terms. Chernew is a...