A key shareholder lawsuit alleges that the board members of the US health insurance supergiant UnitedHealth Group ignored a range of corporate governance and supervisory risks for years until a catastrophic mistake broke out, which ultimately cost investors billions of dollars. A revised lawsuit filed in a federal court in Minnesota on August 7 revealed new information from people familiar with the company's former insider on how UnitedHealth handled cybersecurity issues after acquiring a company that was later affected by the largest healthcare data breach recorded in the US. The lawsuit also alleges that UnitedHealth, which owns America's largest health insurance provider, closed an internal audit program that previously discovered the company's issues with Medicare billing. UnitedHealth has previously faced accusations from whistleblowers and government regulators that it inflated Medicare payments; the US Department of Justice has also launched criminal and civil investigations into its Medicare business practices.

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