The nation’s second-largest health-insurance company said Wednesday that as many as 80 million customers have had their account information stolen. Anthem Inc. posted a statement on its website explaining that hackers gained access to customer information, including names, birthdays, medical IDs, Social Security numbers, street addresses, email addresses, and employment information such as income data, said CEO Joseph Swedish. The hack applies to both current and former customers, the statement said. The company has contacted the FBI and is working to evaluate the systems with computer security firm Mandiant. The breach was discovered last week, according to Anthem.