UnitedHealth Group has reported that a ransomware attack on Change Healthcare compromised the private health information of over 100 million individuals, marking the largest known digital theft of U.S. health data. The breach, which occurred in February, led to extensive outages in the healthcare sector. The stolen data includes personal details, medical records, and financial information. UnitedHealth began notifying affected individuals in late July. The attack was attributed to the Russian-speaking ALPHV/BlackCat gang, which demanded a ransom of $22 million. Investigations into the breach and its broader implications are ongoing.