Change Healthcare now estimates that 190 million people were impacted in the massive cyberattack that took down its services nearly a year ago. | Change Healthcare now estimates that 190 million people were impacted in the massive cyberattack that took down its services nearly a year ago.

About 190 million Americans may have been affected by a cyberattack targeting UnitedHealth‘s subsidiary, Change Healthcare. The breach, which disrupted the company’s IT systems, resulted in the compromise of sensitive personal and medical information.

UnitedHealth Group says the impact from the cyberattack last year at its Change Healthcare subsidiary is much wider than previously understood, affecting roughly 190 million patients — up from previou