In February, Change Healthcare, a tech company owned by UnitedHealth Group (UHG), underwent a massive cyberattack that involved paying a $22 million ransom to resolve.
On Thursday, UHG quantified the number of people affected by the attack for the first time, eight months after the breach happened. A new filing in the U.S. Department of Health and Human Services portal on Thursday shows that one-third of the U.S. population, or about 100 million Americans, had their data stolen during the breach.
The cyberattack exposed sensitive health records, like medical diagnoses, test results, medications, and health plans, as well as Social Security numbers and other personally identifiable information.
Related: UnitedHealth Paid Ransom
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