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UnitedHealth says Change Healthcare hacked by nation state, as pharmacy outages drag onU.S. health insurance giant UnitedHealth Group said Thursday in a filing with government regulators that its subsidiary Change Healthcare was compromised likely by government-backed hackers. In a filing Thursday, UHG blamed the ongoing cybersecurity incident affecting Change Healthcare on suspected nation state hackers but said it had no timeframe for when its systems would be back online. UHG did not attribute the cyberattack to a specific nation or government, or cite what evidence it had to support its claim. Change Healthcare provides patient billing across the U.S. healthcare system. Change Healthcare has not yet disclosed the specific nature of its cyberattack.