Call us at 1.866.986.0356 (TTY users: 711), 24 hours a day, 7 days a week to speak with a representative for help. You can also call Medicare directly at 1.800.MEDICARE or 1.800.633.4227. TTY users: 1.877.486.2048. Explain your circumstances to a representative. It may be possible to switch plans at other times, depending on your situation.