The best time to enroll in a Medigap plan is during your Medigap Open Enrollment Period, which starts on the first day of the month in which you are both 65 years old and enrolled in Medicare Part B. During this period, you have a guaranteed issue right, meaning you can purchase any Medigap policy available in your state without medical underwriting. This is especially important for cancer patients, as insurers cannot deny coverage or charge higher premiums based on pre-existing conditions during this period.
