No. You can enroll in any available plan or option, and you can change plans or options during the annual open season or with an event that permits an enrollment change (such as when you become eligible for Medicare).
There was an unexpected error when performing your action.
Your error has been logged and the appropriate people notified. You may close this message and try your command again, perhaps after refreshing the page. If you continue to experience issues, please notify the site administrator.