U.S. medical insurance big UnitedHealth Group mentioned Thursday in a submitting with authorities regulators that its subsidiary Change Healthcare was compromised doubtless by government-backed hackers.

In a submitting Thursday, UHG blamed the continued cybersecurity incident affecting Change Healthcare on suspected nation state hackers however mentioned it had no timeframe for when its programs could be again on-line.

UHG didn’t attribute the cyberattack to a particular nation or authorities, or cite what proof it needed to help its declare.

An organization spokesperson didn’t reply to a request for remark on the time of writing.

Change Healthcare gives affected person billing throughout the U.S. healthcare system. The corporate processes billions of healthcare transactions yearly and claims it handles round one-in-three U.S. affected person data, amounting to round 100 million People.

The cyberattack started early Wednesday, in accordance with the corporate’s incident tracker.

Change Healthcare has not but disclosed the precise nature of its cyberattack.

Pharmacies throughout the U.S. are reporting that they’re unable to meet prescriptions by way of sufferers’ insurance coverage because of the ongoing outage at Change Healthcare, which handles a lot of the billing course of.

A number of individuals who work within the healthcare area and whose work is affected by the outage inform TechCrunch that they’re experiencing downtime due to the continued cyberattack.

UHG mentioned in its submitting that it has “retained main safety specialists, is working with legislation enforcement and notified prospects, purchasers and sure authorities companies.”