Ihosvany Marquez spent his Medicare millions on a fleet of luxury cars, authorities say, including a Lamborghini Murcielago with spaceship-like doors that cost $455,959.

Early Monday, he pleaded guilty in Miami federal court to healthcare fraud charges alleging he submitted $55 million in false Medicare claims for HIV and cancer services at his seven Miami-Dade and Orlando clinics. Between 2005 and 2007, he and his partners raked in $22 million from the taxpayer-funded healthcare program.

Marquez, a Miami-Dade resident who could face more than 20 years in prison, ranks as a big spender among the hundreds of local Medicare-licensed operators accused of ripping off the government program for the elderly and disabled.

Among Marquez's alleged 19 car purchases for himself, his wife, other relatives and his personal trainer: A Lamborghini Gallardo, a Ferrari 612 Scaglietti, two Bentley Continental GTs, two Mercedes Benz CL63s and at least six Mercedes Benz S550s. The total tab: $2.7 million. He also spent $545,652 on jewelry and watches, among them a Rolex Meteorite for $48,000 and a diamond necklace for $108,443, authorities say. And he bought a seven-carat diamond ring for $98,086.