CareFirst Says 1.1 Million Customers Affected by Breach

CareFirst, a Blue Cross plan, became the third major health insurer in the United States to disclose this year that hackers had breached its systems and potentially compromised some customer information. The company, which is based in Maryland and serves the Washington, D.C., area, called the attack that occurred last June a “sophisticated” one that could have affected as many as 1.1 million of its customers.