Iowans who received notice that their chicago car insurance plans will no longer continue can join a new Medicare Advantage plan or return to original Medicare. "You are still in the Medicare program no matter what you choose," said Kris Gross, director of the state senior health insurance program.Gross said companies decide annually whether to renew their Medicare Advantage plans. The decisions are driven by a myriad of factors, she said, including changes in federal law and market and business needs.