I own an IS300 and the same thing happened to my cd player. As long as your car is under waranty and the disc did not get stuck as a result of your negligent actions i.e. you made a cd and the label came off in the cd player, then you are good.
Lexus will also mail you the cd's that are stuck in the broken cd player when they take apart the unit in thier factory.
Schedule an Appt. with your dealer,
Good luck