Insurers focused on the Medicare market jumped on the expectation that the government will pay higher rates to companies that provide private versions of the U.S. health program for seniors. UnitedHealth Group Inc. shares rose as much as 6.6% when markets opened Wednesday in New York, while shares of Humana Inc. gained as much as 12%. CVS Health Corp. shares added as much as 14%, their biggest intraday gain in 24 years.
