Medicare Supplement Enrollment Windows
Understanding when you can enroll in or change a Medicare Supplement (Medigap) plan is extremely important. While Medicare Supplement plans can technically be applied for year-round, certain enrollment periods provide valuable protections that make enrollment easier and more affordable.
Medicare Supplements
Medicare Supplement Enrollment Windows
Understanding when you can enroll in or change a Medicare Supplement (Medigap) plan is extremely important. While Medicare Supplement plans can technically be applied for year-round, certain enrollment periods provide valuable protections that make enrollment easier and more affordable.
Medicare Supplement Open Enrollment Period
Your Medicare Supplement Open Enrollment Period is the best time to enroll in coverage.
This enrollment window lasts 7 months and surrounds your 65th birthday:
- Begins 3 months before your birthday month
- Includes your birthday month
- Ends 3 months after your birthday month
Why This Period Matters
During this time:
✅ You cannot be denied coverage
✅ No medical underwriting is required
✅ Insurance companies cannot charge higher premiums due to health conditions
✅ You may choose any available Medicare Supplement plan and carrier
For individuals who delay Medicare because they continue working and maintain employer coverage, similar guaranteed enrollment rights may apply once that employer coverage ends.
Guaranteed Issue Enrollment Situations
Outside of your Open Enrollment Period, approval for a Medicare Supplement plan may normally require health questions. However, certain situations provide Guaranteed Issue Rights, allowing enrollment without medical underwriting.
Examples include:
- Leaving a Medicare Advantage plan during your first year (Trial Right)
- Moving outside your plan’s service area
- Losing coverage through no fault of your own
- Insurance carrier termination or bankruptcy
Eligibility and plan options may vary depending on the situation.
State-Specific Medicare Supplement Enrollment Rules
Some states provide additional opportunities to change Medicare Supplement plans without answering health questions.
Birthday Rule States
Residents in certain states may switch Medicare Supplement plans annually around their birthday.
These enrollment windows typically allow movement to a plan with equal or lesser benefits.
States with Birthday Rule protections include:
California
- In California there is a 91-day window beginning 30 days before your birthday.
- Lesser or equal coverage with any carrier.
Idaho
- In Idaho there is a 63-day window beginning on your birthday.
- Lesser or equal coverage with any carrier.
Illinois (ages 65–75)
- 45-day window beginning on your birthday
- Lesser or equal coverage with your current carrier.
- Only applies if you are between 65 and 75 years old.
Nevada
- 61-day window beginning on the first day of your birth month.
- Lesser or equal coverage with any carrier.
Oregon
- 31-day window beginning on your birthday.
- Lesser or equal coverage with any carrier.
Louisiana
- 93-day window beginning 30 days before your birthday.
- Lesser or equal coverage with your current carrier.
Maryland
- 31-day window beginning on your birthday.
- Lesser or equal coverage with any carrier.
Kentucky
- 60-day window beginning on your birthday
- Plan to Plan only (G to G)
Enrollment windows vary by state and generally range from 30 to 90 days surrounding your birthday.
Year-Round Enrollment States
A small number of states allow Medicare Supplement enrollment at any time during the year, regardless of health status.
These states include:
- New York
- Connecticut
- Vermont
- Washington
- Oklahoma
Residents may change or enroll in coverage without medical underwriting year-round.
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Missouri Anniversary Rule
Missouri residents may change to a Medicare Supplement plan offering equal or lesser coverage during the month prior to their policy anniversary date, without health questions.
Maine Annual Enrollment Opportunity
In Maine, insurance carriers must offer at least one designated month each year during which applicants must be accepted into Medicare Supplement Plan A.
Additionally, individuals may switch to plans with equal or lesser benefits if continuous supplemental coverage has been maintained without extended gaps.
Get Help Choosing the Right Time to Enroll
Enrollment rules can vary based on your age, state, current coverage, and Medicare eligibility timeline.
Working with a licensed Medicare advisor can help you:
- Understand your enrollment rights
- Compare available Medicare Supplement plans
- Avoid unnecessary underwriting
- Make confident coverage decisions
Schedule Your Free Medicare Consultation
Have questions about Medicare Supplement enrollment or want help reviewing your options?
Schedule a free consultation today and get personalized guidance based on your situation.