VIDEO: Jeremy Piven Gives His Side Of "Sushi-Gate"

Actor Jeremy Piven, victorious in a lawsuit last week against the producers of David Mamet's Broadway show, Speed the Plow, told David Letterman on Tuesday night that upon being diagnosed with Mercury poisoning from eating sushi, he had "brought the test results to the company, to the Speed the Plow people.”

“I told them what was going on with me; they knew what was happening," Piven said, adding more details about the sickness that caused him to leave the production.

The Entourage star said doctors told him: "'You've got elevated levels of mercury we've never seen before, basically almost a 60. We should not have anything above a 3,'" adding he was also stricken with "Epstein-Barr, which is, you know, Mono. There were so many different variables that were contributing to my situation."

Back to his joking ways, Piven, a Chicago native, said the Mercury poisoning "sounds like a rich man's disease; It sounds like something you might get from the leather seats in your Lamborghini, like a rash, like a rash that hurts."

He expressed regret over not being able to finish the show.

"At a certain point, you're brought to your knees and you realize, 'I gotta find balance.' It happened to me, I'm so sorry that it happened because I wanted to continue the Broadway run," Piven said. "It was the time of my life."