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Medicare Open Enrollment runs each year from Oct. 15 to Dec. 7 and lets people make certain Medicare plan changes. Medigap Open Enrollment is a separate, one-time six-month period tied to being at least 65 and enrolled in Part B, when insurers generally cannot deny a policy or charge more for pre-existing conditions.
A Seniors Guide report highlights a key distinction for people choosing Medicare coverage: Medicare Open Enrollment, held annually from Oct. 15 to Dec. 7, is not the same as the one-time Medigap Open Enrollment period, which lasts six months after a person is at least 65 and enrolled in Part B. The difference matters because the Medigap window offers protections against health-based denials and higher premiums that may not apply after it ends.
During the annual Medicare Open Enrollment period, beneficiaries can make certain changes to their coverage, including switching between Original Medicare and Medicare Advantage and reviewing or changing Part D prescription drug coverage. The source report identifies Oct. 15–Dec. 7, 2026 as the dates for this year’s period. It is a recurring opportunity to review eligible Medicare coverage options, not a yearly chance to obtain Medigap’s initial enrollment protections.
Medigap, also called Medicare Supplement Insurance, is sold by private insurers and can help pay certain out-of-pocket costs under Original Medicare, such as coinsurance, copayments and deductibles. A person must have Medicare Part A and Part B to buy a Medigap policy; Medigap cannot be used with Medicare Advantage. Prescription drug coverage generally requires a separate Part D plan, and Medigap does not cover every service, including long-term care, routine dental and vision care, or hearing aids.
According to Medicare’s rules as described in the report, the Medigap open enrollment period begins on the first day of the month when a person is both 65 or older and enrolled in Part B. For six months, the person can buy any Medigap policy the insurer sells, and insurers cannot deny coverage or charge more because of pre-existing health problems. After that period, people may still apply in most states, but insurers can generally use medical underwriting, subject to applicable state and federal protections. They may charge more or deny an application.
Why the Six-Month Medigap Window Matters
The two enrollment periods address different decisions, and confusing them could affect both coverage and cost. The annual Medicare period gives people a recurring chance to make certain plan changes, while the Medigap window’s guaranteed enrollment protections are time-limited. A beneficiary who delays considering a supplement policy may face health underwriting later, depending on state rules and whether another guaranteed-issue right applies.
That distinction is especially relevant to people choosing between Original Medicare and Medicare Advantage. Medigap supplements Original Medicare; it does not function as a general add-on for Medicare Advantage. People weighing the options need to consider the coverage they want, premiums and out-of-pocket costs, and whether they may be able to obtain Medigap later. The report does not establish that one choice is best for everyone.
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How the Enrollment Calendars Differ
Medicare’s initial enrollment period is a separate seven-month window around a person’s 65th birthday: it begins three months before the birthday month and ends three months afterward. The report distinguishes that initial sign-up period from the annual Oct. 15–Dec. 7 Medicare Open Enrollment, during which eligible beneficiaries can make specified coverage changes. Rules for enrolling in Medicare can vary based on circumstances such as employer coverage, so the report’s general calendar is not a determination of an individual’s eligibility or deadlines.
Medigap plans are standardized under federal and state rules, though Massachusetts, Minnesota and Wisconsin use different standardization systems, according to the report. Plan availability and costs can vary. The report cites KFF data stating that Plan G accounted for 46% of Medigap policyholders in 2025; it says full-year 2026 data were not yet available. That figure describes enrollment, not a measure of which plan is right for a particular person.
“The Medigap open enrollment period is a six-month window that starts on the first day of the first month you or you and your spouse are both age 65 or older and enrolled in Medicare Part B.”
— Medicare, as summarized in the Seniors Guide report
State Rules and Personal Eligibility
The exact options available after the six-month Medigap window depend on a person’s circumstances, state law and any applicable guaranteed-issue rights. The report says insurers in most states may use medical underwriting after the protected period, but it does not detail every state exception or individual circumstance. Readers should not assume that a late application will be accepted or priced the same way as one made during the initial window.
The source also does not provide a personal premium comparison, identify every policy available in each location, or settle how a particular employer plan affects an individual’s Medicare enrollment deadlines. Its reference to the 2026 Medicare enrollment dates concerns the annual period; those dates do not determine when an individual’s Medigap six-month window begins.
Check Dates Before Changing Coverage
People considering a plan change should first identify whether they are making a Medicare coverage choice during the annual enrollment period or applying for a Medigap policy during their own six-month window. They can compare policy benefits and premiums, confirm whether a policy is available in their state, and ask how underwriting may apply if their protected period has passed. For questions about eligibility or deadlines, they can check official Medicare information or contact their State Health Insurance Assistance Program.
The next annual Medicare Open Enrollment period identified by the report runs Oct. 15 through Dec. 7, 2026. A person’s Medigap period does not follow that calendar: it is determined by age and Part B enrollment, so the relevant date depends on the individual.
Key Questions
Are Medicare Open Enrollment and Medigap Open Enrollment the same?
No. Medicare Open Enrollment occurs annually and allows certain Medicare coverage changes. Medigap Open Enrollment is generally a one-time, six-month period tied to being at least 65 and enrolled in Part B.
When does the Medigap six-month period begin?
As described in the report, it starts on the first day of the month when you are both 65 or older and enrolled in Medicare Part B. It is not set by the Oct. 15–Dec. 7 annual Medicare dates.
Can an insurer deny Medigap coverage after the six-month period?
In most states, insurers may use medical underwriting after the period, which can mean a denial or higher premiums based on health. State rules and other guaranteed-issue rights may affect an individual’s situation.
Does Medigap include prescription drug coverage?
Generally, no. The report says Medigap policies sold after 2005 do not include prescription drug coverage. People seeking that coverage can enroll in a separate Medicare Part D plan.
Source: seniorsguide.com
