The cyberattack at UnitedHealth Group's tech unit last year affected the personal information of 190 million people, the health conglomerate said on Friday, making it the largest healthcare data breach in the U.

A cyberattack on UnitedHealth Group Inc. that paralyzed the US health-care system last year, snarling billions of dollars in payments for doctors and hospitals, also exposed sensitive data from 190 million Americans.

UnitedHealth has confirmed the ransomware attack on its Change Healthcare unit last February affected around 190 million people in America — nearly double previous estimates. "Change Healthcare has determined the estimated total number of individuals impacted by the Change Healthcare cyberattack is approximately 190 million,

The cyberattack at UnitedHealth's tech unit Change affected the personal information of 190 million Americans, TechCrunch reported on Friday.

Updated tally at Change Healthcare, owned by the Eden Prairie-based health care giant, nearly doubles the number of people affected by the massive data breach.