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UnitedHealth Group confirmed that its Medicare Advantage program is under investigation by the U.S. Department of Justice.

The disclosure sent UNH shares tumbling 4.7%, reflecting investor unease with the ongoing troubles with the healthcare stock.

UnitedHealth Group is complying with criminal and civil investigations by the Justice Department regarding its Medicare Advantage business, according to a July 24 regulatory filing by the company.

House Press Secretary Karoline Leavitt declared that "we"—i.e., the federal government—would be inquiring with ABC about disciplinary action.