(CNN) — UnitedHealth Group confirmed Thursday that its Medicare program is under investigation by the US Department of Justice and that it is working with the agency.

The health insurer, which has been in upheaval since the murder of one of its top executives late last year, said in a statement it reached out to the Justice Department after media reports about the investigations.

“The Company has now begun complying with formal criminal and civil requests from the Department,” it said. “The Company has full confidence in its practices and is committed to working cooperatively with the Department throughout this process.”

The Justice Department is investigating UnitedHealth for potential criminal fraud in its Medicare Advantage program, the Wall Street Journal reported in May. The c

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