Published: Jun 22, 2012 6:46 PM EDT

MIAMI (AP) - A South Florida man pleaded not guilty to conspiring to launder tens of millions of Medicare fraud dollars, which federal prosecutors say were funneled into the Cuban banking system.
    
Cuban-native Oscar Sanchez appeared at a hearing Friday in U.S. District Court in Miami. His attorney entered the plea.
    
Sanchez is a U.S. citizen. He is being held in federal custody because prosecutors consider him a flight risk.
    
They say the 46-year-old provided cash to the Medicare fraud ringleaders in exchange for a fee. They also said Sanchez conspired to send money from the scheme to shell companies in Canada before it was passed on through a Trinidad bank to Cuba.
    
Prosecutors are seeking more than $22 million in property from Sanchez. If convicted, he could face 13 years in prison.

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