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 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.

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.

Large-scale attacks on health providers expose the data of millions of Americans each year. Consumers must remain vigilant, experts say.