Although last year’s cyberattack at UnitedHealth was bad enough at 100 million when it was initially reported, the U.S.

In January, the company had estimated the hack at Change Healthcare affected the personal information of 190 million people.

Ann Arbor-based Michigan Medicine is notifying more than 1,000 people that some of their health information may have been exposed after a research study mailed postcards without envelopes. The ...