Data on about 1.1 million current and former subscribers of health insurance company CareFirst has been stolen by hackers, the company has confirmed.

In a statement, the non-profit said it was the target of a "sophisticated" cyberattack, in which a single database of members' names, birth dates, email addresses, and other subscriber data was stolen.

Credit card, social security, and medical data were not taken in the breach. Passwords, which were stored in an unaffected separate system, were not taken.

It follows a long list of health and insurance companies that have suffered at the hands of hackers in recent months, including Anthem and Premera Blue Cross.