Rights and Responsibilities of Disenrollment Medicare Advantage typically only allows you to leave a Medicare Advantage plan during certain time periods: During the Annual Enrollment Period (AEP) from October 15 to December 7 During the Medicare Advantage Open Enrollment Period (OEP) from January 1 to March 31 Special Enrollment Period (Must qualify for SEP) During one of these periods you will be able to disenroll a few ways. Complete and return eternalHealth’s disenrollment form. Call 1-800-MEDICARE, 1-800-633-4227 | TTY, 1-877-486-2048. Enroll into a different Medicare Advantage Plan. You will receive a letter to confirm that you are leaving eternalHealth and information on when your coverage will end with us. Get in touch! We’re available 24/7 to answer any questions you have as you make these very important decisions. Contact Us This page is also available in: Español (Spanish)