The ransomware attack last year against UnitedHealth Group subsidiary Change Healthcare exposed data of more than 190 million people — up from previous reports of 100 million — according to multiple outlets Jan.

UnitedHealth says that the 2024 breach of Change Healthcare impacted the data of 190 million people, up from the prior estimate of 100 million people.

UnitedHealth now says the ransomware attack on its Change Healthcare subsidiary may have affected the data of about 190 million people. The estimate has increased from about 100 million people in October.

The largest healthcare data breach on record just got even bigger, after UnitedHealth Group (UHG) confirmed that 90 million additional customers were impacted by a ransomware attack on Change Healthcare last year.

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 United States.

The cyberattack at UnitedHealth Group exposed personal information of 190 million people, leading to a $22 million ransom payment in bitcoin.