Breach announced: August 18
Chinese hackers were suspected in the April and June cyber attacks that stole personal information of patients from one of the largest hospital networks in the U.S., Community Health Systems, which comprises 206 hospitals across 29 states. Patient names, addresses, phone numbers, birth dates, and Social Security numbers were taken. But credit card numbers were untouched, as well as data regarding medical devices.
Number of customers affected: 4.5 million people, who over the last five years had received services from, or been referred by, doctors affiliated with Community Health Systems.