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Medicare open enrollment runs each year from Oct. 15 through Dec. 7 and allows people to make certain Medicare plan changes. Medigap open enrollment is a separate, one-time six-month window tied to turning 65 and enrolling in Part B, with protections against health-based denial or higher premiums.
A Seniors Guide report comparing Medigap with Medicare open enrollment says the two periods are separate: Medicare’s annual window runs Oct. 15 through Dec. 7, while Medigap’s protected enrollment period generally lasts six months and starts when someone is at least 65 and enrolled in Part B. The distinction matters because the Medigap window happens only once, and protections against health-based denial or higher premiums may expire when it ends.
During Medicare 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 report gives the 2026 dates as Oct. 15-Dec. 7. This annual period is not the same as the initial Medicare enrollment period, which generally spans seven months around a person’s 65th birthday.
Medigap, also called Medicare Supplement Insurance, is sold by private insurers to help pay some out-of-pocket costs associated with Original Medicare, such as coinsurance, copayments and deductibles. It is available only to people with Original Medicare—Part A and Part B—not those enrolled in Medicare Advantage. Prescription drug coverage generally requires a separate Part D plan.
The report says the Medigap open enrollment window begins on the first day of the month in which a person is both 65 or older and enrolled in Part B. For six months, the person can buy any Medigap policy an insurer sells in their state, and insurers cannot deny coverage or charge more because of pre-existing health conditions. Once that period ends, state and federal rules may still provide certain enrollment rights, but in most states insurers can use medical underwriting when no guaranteed-issue protection applies.
The One-Time Medigap Protection Window
The practical difference is timing and risk. Medicare’s annual enrollment period recurs each year, but Medigap’s federal open enrollment protection generally does not. People who delay buying a supplement may later face underwriting, higher premiums or, in some circumstances, inability to obtain a policy, according to the report.
This can affect people deciding between Original Medicare plus Medigap and Medicare Advantage. Medigap can help with specified Original Medicare cost-sharing, but it does not cover every service and does not include most prescription drug coverage. The report lists examples generally not covered, including long-term care, routine dental and vision care, hearing aids and private-duty nursing. The details depend on the policy and applicable rules, so the enrollment dates alone do not determine which option is suitable.
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How the Two Enrollment Periods Differ
Medicare’s annual open enrollment period is a recurring opportunity to make certain coverage changes; it is distinct from the initial Medicare enrollment period, which lasts seven months around a person’s 65th birthday. The report says people who miss initial enrollment may have another opportunity during the annual period, though enrollment rules and potential penalties can depend on individual circumstances and other coverage.
Medigap policies are standardized in most states, with plan letters describing benefits, while Massachusetts, Minnesota and Wisconsin use different standardization approaches. The report cites KFF figures indicating that Plan G represented 46% of Medigap policyholders in 2025; it says full-year 2026 data were not yet available. Plan availability and premiums vary by location and insurer. The report also notes that some states have additional consumer protections, so the federal six-month window is not the only rule that may matter.
“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.”
— Seniors Guide report, citing Medicare
State Rules and Individual Eligibility
The report provides a general account, but individual enrollment rights can vary based on state law, age, disability status, existing coverage and qualifying events. It does not identify every state-specific guaranteed-issue right or explain how each person’s work-based insurance may affect enrollment timing. Premiums, available policies and underwriting practices also vary by insurer and location.
The report cites 2025 Medigap enrollment figures but says full-year 2026 figures were not available. It also does not provide current premium comparisons or a detailed assessment of a reader’s personal coverage options. Anyone considering a change should verify dates and eligibility with Medicare, their State Health Insurance Assistance Program or a licensed insurance professional.
Check Dates Before Changing Coverage
People reviewing coverage should first confirm whether they are dealing with Medicare’s annual election period, their initial enrollment period or the separate Medigap window. For 2026, the report lists Medicare open enrollment as Oct. 15-Dec. 7. A person nearing 65 who has Part B should check the start date of the six-month Medigap period and compare available policies before it expires.
Before switching, beneficiaries can confirm plan availability, premiums, benefits and state-specific rights with official Medicare resources or a state counseling program. The report does not announce a policy change; the immediate takeaway is to verify which window applies, since missing the Medigap protection period can have consequences that an annual Medicare enrollment opportunity may not reverse.
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 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 start?
According to the report, it starts on the first day of the month in which you are both 65 or older and enrolled in Part B. Check your specific dates and any state protections before relying on the general rule.
Can I buy Medigap while enrolled in Medicare Advantage?
Medigap is designed to supplement Original Medicare and is not used with Medicare Advantage. To use Medigap, a person must have Part A and Part B and be enrolled in Original Medicare.
What happens if I apply for Medigap after the six-month window?
In many states, insurers may use medical underwriting when no guaranteed-issue right applies. They may be able to charge more or deny an application, though state rules and qualifying circumstances can provide additional protections.
Source: seniorsguide.com
