UnitedHealth confirmed that a ransomware attack on its Change Healthcare unit affected around 190 million people, marking it as the largest medical data breach in U.S. history. The attack caused significant disruptions across the healthcare system and involved the theft of health and insurance-related data. Despite the scale of the breach, UnitedHealth stated it had not identified any misuse of the stolen information. The company had previously estimated the impact to be about 100 million individuals but revised it following an in-depth analysis.
The February 2024 cyberattack is the largest breach of medical data in U.S. history and caused months of outages across the U.S. healthcare system.
Change Healthcare has determined the estimated total number of individuals impacted by the Change Healthcare cyberattack is approximately 190 million.
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