UPMC Health Plan has suffered a data breach, and today notified its members, according to a spokeswoman for the insurer. Neither Social Security numbers nor medical information was included in the lost material, wrote Gina Pferdehirt, director of public relations for UPMC Health Plan, in an email response to questions. "So while we take this seriously, in context the breach is very minor," Ms. Pferdehirt wrote. She did not provide further detail.