Medicare Supplement Insurance (Medigap), Explained Simply
Medicare Supplement Insurance, often called Medigap, is designed to work alongside Original Medicare to help pay some of the costs Medicare doesn't cover — like copayments, coinsurance, and deductibles.
In short: Medigap policies are sold by private insurance companies and standardized by letter (like Plan G or Plan N). They help pay remaining costs after Original Medicare pays its share, generally without a provider network.
Who This May Be Designed For
Medigap may be worth reviewing if you want the flexibility to see any provider who accepts Medicare, prefer predictable out-of-pocket costs, and don't mind paying a separate monthly premium in exchange for that flexibility.
✔ What It Generally Covers
- Costs like coinsurance and copayments left over after Original Medicare pays
- In many plans, the Medicare Part A deductible
- Coverage that generally travels with you nationwide
- The ability to see any provider who accepts Medicare, with no referral needed
✕ What It Generally Does Not Cover
- Prescription drugs — a separate Part D plan is needed
- Routine dental, vision, or hearing care
- Long-term custodial care
- New enrollees in Medigap after certain dates may face medical underwriting outside protected windows
Eligibility Considerations
Generally, you must be enrolled in Medicare Part A and Part B. The best time to enroll without medical underwriting is typically during your Medigap Open Enrollment Period, which starts when you're 65 and enrolled in Part B.
Enrollment Considerations
Outside your initial Medigap Open Enrollment Period, insurers may ask health questions and can deny coverage or charge more in some states, so timing matters.
Important Limitations
Medigap premiums can rise over time, and plans don't include drug coverage or extra benefits like dental and vision — those are handled separately.
Common Questions
Can I switch from Medicare Advantage to a Medigap plan?
Yes, though outside certain protected enrollment windows you may be asked medical underwriting questions, and acceptance isn't guaranteed.
Do Medigap plans include prescription drug coverage?
No. Medigap plans generally do not include Part D drug coverage — you'd pair a Medigap policy with a standalone Part D plan.
Can I see any doctor who accepts Medicare with a Medigap plan?
Generally, yes — most Medigap plans let you see any provider who accepts Original Medicare, with no network restriction.
Does O'Neal Insurance Group offer every Medigap plan available?
No. We do not offer every plan available in your area. Any information we provide is limited to the plans we offer where you live.
Related Options
Official Resources
This page is educational and not individualized advice. It does not cover every plan letter or state variation. Coverage, costs, and availability vary by carrier, county, and year. A licensed agent can review your specific situation with you.
O'Neal Insurance Group is an independent insurance agency and is not connected with or endorsed by the federal Medicare program. We do not offer every plan available in your area. Please contact Medicare.gov, call 1-800-MEDICARE, or contact your local State Health Insurance Assistance Program for information about all of your options.
Talk With James O'Neal Directly
James can walk through whether Medigap or Medicare Advantage fits your doctors and budget better — by phone or online screen-share.
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