This is the best summary I could come up with:

On Thursday, UnitedHealth Group accused a notorious ransomware gang known both as AlphV and Black Cat of hacking its subsidiary Optum.

With no easy way for pharmacies to calculate what costs were covered by insurance companies, many had to turn to alternative services or offline methods.

In December, the FBI and its equivalent in partner countries announced they had seized much of the AlphV infrastructure in a move that was intended to disrupt the group.

“The cyberattack against Change Healthcare that began on Feb. 21 is the most serious incident of its kind leveled against a US health care organization,” said Rick Pollack, president and CEO of the American Hospital Association.

Citing Change Healthcare data, Pollack said that the service processes 15 billion transactions involving eligibility verifications, pharmacy operations, and claims transmittals and payments.

Optum estimated that as of Monday, more than 90 percent of roughly 70,000 pharmacies in the US had changed how they processed electronic claims as a result of the outage.

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