American Hospital Association CEO Rick Pollack said effects of the attack “are continuing to be felt throughout the entire health care system.”

Fallout from a ransomware attack on the country’s largest health care payment processor is “the most serious incident of its kind leveled against a U.S. health care organization,” American Hospital Association CEO Rick Pollack said Thursday evening.

The attack has crippled Change Healthcare, a company that provides a widely used program for health care providers to manage customer payments and insurance claims. The company has taken most of its systems offline to prevent the attack from spreading, a common countermeasure.

“Nine days into the attack on Change Healthcare, a health care technology company that is part of Optum and owned by UnitedHealth Group, effects are continuing to be felt throughout the entire health care system,” Pollack said in a news release. The American Hospital Association is the country’s largest health care industry group.

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