UnitedHealth Group has reported a massive cyberattack on its Change Healthcare unit, affecting around 190 million individuals—marking the largest healthcare data breach in U.S. history. The Blackcat ransomware group was responsible for this breach, which exposed sensitive information but, so far, has shown no evidence of misuse. As a result, UnitedHealth faces class action lawsuits and significant concerns over healthcare data security. Source and details of the news