Downbeat Outlook Cripples Health Care Stocks By: CNBC.com News July 25, 2012 at 14:36 PM EDT The Morgan Stanley Healthcare Payors Index has turned negative for the year after falling as much as 4.4 percent in Wednesday's trading session. Read More >> Related Stocks: Aetna Centene Corp Humana Molina Healthcare Inc UnitedHealth Group Wellcare Group