Your medical data is not as safe as you think. Discover how a massive ransomware attack exposed millions and the key steps to protect your privacy now.

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 new estimate nearly doubles the company’s previous report of 100 million affected individuals, already the largest healthcare data breach ever reported to federal regulators.

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.

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's (NYSE:UNH) tech unit last year, which paralyzed the U.S. healthcare system, exposed the personal information of about 190 million people. The nation's largest health insurer said Change Healthcare was not aware of any misuse of individuals' data as a result of the incident.

UnitedHealth has revealed that 190 million Americans had their personal and healthcare data stolen in the Change Healthcare ransomware attack, nearly doubling the previously disclosed figure.

The updated tally extends the scope beyond what was previously described by company Chief Executive Andrew Witty.

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.

The attack, originally thought to have impacted about a 100 million Americans, is even larger than originally disclosed.