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Medicare open enrollment runs each year from Oct. 15 to Dec. 7 and lets beneficiaries make certain changes to their Medicare coverage. Medigap open enrollment is a separate, one-time six-month period tied to turning 65 and enrolling in Part B, when insurers generally cannot deny coverage or charge more because of pre-existing conditions.
A Seniors Guide report comparing Medicare open enrollment with the separate Medigap open enrollment period highlights a timing difference that can affect whether beneficiaries can obtain supplemental coverage without health-based restrictions. Medicare’s annual enrollment period runs from Oct. 15 to Dec. 7, while a person’s six-month Medigap window generally begins when they are at least 65 and enrolled in Medicare Part B—and does not recur each year.
During Medicare’s annual open enrollment, beneficiaries can make certain changes to their coverage, including switching between Original Medicare and Medicare Advantage and reviewing or changing their Part D prescription drug plan. The source report gives Oct. 15-Dec. 7, 2026, as the dates for that year’s period. This is a recurring opportunity to review eligible Medicare coverage choices; it is not the enrollment window that guarantees access to a Medigap policy.
Medigap, also called Medicare Supplement Insurance, is sold by private insurers and can help pay some out-of-pocket costs associated with Original Medicare, such as coinsurance, copayments and deductibles. A beneficiary must have Original Medicare, including Part A and Part B, to buy a Medigap policy. Medigap does not pair with Medicare Advantage, and it generally does not provide prescription drug coverage; beneficiaries seeking that coverage can enroll in a separate Part D plan.
The Medigap open enrollment period lasts six months, starting on the first day of the month in which a person is 65 or older and enrolled in Part B. During that period, the report says, insurers must allow the person to enroll in any Medigap policy they sell and cannot deny coverage or charge more because of pre-existing health problems. Once the window ends, people may still apply in most states, but insurers can generally use medical underwriting, subject to applicable rules. An insurer might deny an application or charge a higher premium based on health.
Why the Medigap Deadline Matters
The distinction matters because changing Medicare coverage during the annual enrollment period does not restart or extend a person’s Medigap six-month window. Someone who delays buying a supplement may face fewer options or higher costs later, depending on state and federal protections and the insurer’s underwriting rules. That can make decisions about Original Medicare and Medicare Advantage consequential beyond the annual review period.
Medigap can reduce some out-of-pocket costs under Original Medicare, but it comes with a separate monthly premium and does not cover every service. The source report lists items generally excluded from Medigap, including long-term care, routine dental and vision care, hearing aids and private-duty nursing. Coverage varies by plan, and some policies may cover emergency medical care during foreign travel. Comparing benefits and premiums against likely needs is relevant, but the report does not establish that one option is best for every beneficiary.
For people approaching age 65 or enrolling in Part B later, understanding the two calendars can help prevent a mistaken assumption that Medicare’s annual window guarantees the same protections as Medigap’s initial enrollment period. Those considering a switch should check how the change affects their eligibility and coverage before acting.
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Two Enrollment Calendars, Different Rules
Medicare’s initial enrollment period is a seven-month window around a person’s 65th birthday: it begins three months before the birthday month, includes that month and ends three months afterward. The source report distinguishes that initial period from the annual Medicare open enrollment period, when people can make specified coverage changes. People who remain covered through an employer may have circumstances that affect when they enroll; the report notes that someone can sign up for Medicare while still on an employer health plan, but does not detail coordination rules for every situation.
Medigap’s protected enrollment window is anchored to age 65 and Part B enrollment, rather than the calendar-year Medicare enrollment dates. The source says it occurs once and does not repeat annually. Standardized Medigap plans are generally identified by letters, although Massachusetts, Minnesota and Wisconsin use different standardization approaches. The report cites KFF data showing Plan G accounted for 46% of policyholders in 2025; it says full-year 2026 data was not yet available. That figure describes policyholders in 2025, not a forecast or current-year enrollment total.
“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 report describes general rules, but a person’s options after the six-month Medigap window can depend on state law, individual circumstances and available policies. It does not list every situation that may provide guaranteed access to Medigap outside the initial window, nor does it explain how employer coverage affects each person’s Part B enrollment timing. The exact premiums, underwriting practices and policy availability also vary by insurer and location.
The source gives 2026 Medicare open enrollment dates but does not provide a full review of all plan changes or deadlines that may apply to a particular beneficiary. Its KFF comparison is explicitly based on 2025 policyholder data, with full-year 2026 figures unavailable at the time described. Readers should verify current dates and eligibility with Medicare, their state insurance department or a qualified counselor before making coverage decisions.
Check Coverage Before Enrolling
People weighing a change should first confirm whether they have Original Medicare or Medicare Advantage, when their Part B coverage began, and whether they are still within their six-month Medigap window. They can then compare the premiums and benefits of available Medigap policies, and review Part D separately if they need prescription drug coverage.
For 2026, the source identifies Medicare open enrollment as running from Oct. 15 through Dec. 7. Beneficiaries considering a change should check official Medicare information and state-specific rules, particularly if they hope to move from Medicare Advantage to Original Medicare and also want Medigap. The report does not provide an individual eligibility determination or a later policy deadline beyond those dates.
Key Questions
Is Medigap open enrollment the same as Medicare open enrollment?
No. Medicare open enrollment is an annual period for certain Medicare coverage changes. Medigap open enrollment is a separate six-month period tied to being at least 65 and enrolled in Part B, and it generally occurs once.
When does the Medigap six-month period start?
According to the report’s summary of Medicare rules, it starts on the first day of the month when a person is 65 or older and enrolled in Part B. A person’s own start date depends on when those conditions are met.
Can I buy Medigap if I have Medicare Advantage?
Medigap is intended to supplement Original Medicare, not Medicare Advantage. The report says a person must have Medicare Part A and Part B to buy a Medigap policy.
Does Medigap include prescription drug coverage?
Generally, no. The report says Medigap policies sold after 2005 do not include prescription drug coverage. People seeking Medicare drug coverage can consider a separate Part D plan.
What happens if I apply for Medigap after my enrollment period?
In most states, a person may still apply, but insurers can use medical underwriting unless a protection applies. That may mean an application is denied or a higher premium is charged; rules and exceptions vary by state and circumstances.
Source: seniorsguide.com
