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U.S. wellness insurance giant UnitedHealth Group ( UHG ) said Thursday in a filing with politics regulators that its subsidiary Change Healthcare was compromised , likely by regime - back hackers .

Ina filingThursday , UHG charge theongoing cybersecurity incident impress Change Healthcareon suspected land - state hackers but said it had no timeframe for when its systems would be back online .

UHG did not impute the cyberattack to a specific nation or government , or cite what grounds it had to put up its claim .

A company spokesperson did not respond to a request for comment at the time of piece of writing .

Change Healthcare provides patient billing across the U.S. healthcare system . The company processes billions of health care transactions annually and claim it handles around one in three U.S. patient phonograph recording , amounting to around 100 million Americans .

The cyberattack began other Wednesday , according to the companionship ’s incident tracker .

Change Healthcare has not yet let on the specific nature of its cyberattack .

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chemist’s shop across the U.S. are reporting that they are unable to fulfil prescription through patients ’ insurance due to the on-going outage at Change Healthcare , which manage much of the billing unconscious process .

Several people who work in the healthcare space and whose work is affect by the outage tell TechCrunch that they are experiencing downtime because of the ongoing cyberattack .

UHG said in its filing that it has “ keep back chair security expert , is act with law of nature enforcement and notified customers , client and sure regime bureau . ”

US health technical school giant Change Healthcare hit by cyberattack