The massive cyberattack on Change Healthcare has potentially compromised the personal and protected health information of an untold number of Americans, according to parent company UnitedHealth Group.

The personally identifiable information and protected health information for “a substantial proportion of people in America” might have been among the compromised files, UnitedHealth said Monday in a press release announcing preliminary findings from its investigation.

Adrianne Appel writes regulatory news, policy, and trends for Compliance Week. She previously reported about policy developments for Bloomberg Law and Bloomberg Government. Email: adrianne.appel@complianceweek.com LinkedIn:...