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DENVER — DaVita, the dialysis giant based in Denver, has set aside $300 million to settle criminal and civil anti-kickback investigations, the company’s CEO said Thursday.

According to the Denver Post, DaVita has been the focus of a Denver grand jury investigation looking at whether or not the company paid a kickback to kidney doctors to guarantee a steady stream of patients at DaVita clinics.

Neither the U.S. Attorney nor a DaVita spokesman would comment on the case.

DaVita CEO Kent Thiry called the money part of “comprehensive offer to settle all the related civil, administrative and criminal matters.”

The grand jury investigation has been going on for over a year. The central question in the case is whether DaVita charged fair market value to a group of kidney doctors who received partial ownership of seven dialysis clinics.