Several lawmakers questioned whether the company had become so large — with tentacles in every aspect of the nation’s medical care — that the effects of the hack were outsize.
Andrew Witty, the chief executive of UnitedHealth Group, acknowledged before the Senate Finance Committee that hackers had found a weakness in its cybersecurity that forced the shutdown of a vast billing and payments system.
Despite the explosion in ransomware hacks like the one against Change Healthcare, regulation is spotty and few new safeguards have been proposed to protect patient data, vulnerable hospitals and medical groups.
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