Medicare covers a lot, but not everything. Hospital stays, doctor visits, and outpatient care are largely handled by Original Medicare (Parts A and B). What it doesn’t cover are the gaps: copayments, coinsurance, deductibles, and costs that can add up fast if you’re managing a chronic condition or face an unexpected hospital stay.
That’s where Medicare Supplement insurance, commonly called Medigap, comes in.
What Medicare Supplement plans actually cover
Medigap plans are sold by private insurers but standardized by the federal government, meaning a Plan G from one carrier covers the same things as a Plan G from another. The differences come down to price, customer service, and the carrier’s financial strength, not the coverage itself.
Depending on the plan you choose, Medigap can help pay for:
- Part A coinsurance and hospital costs for an extra 365 days after Medicare benefits run out
- Part B coinsurance or copayments
- Blood transfusions, the first three pints
- Part A hospice care coinsurance
- Skilled nursing facility coinsurance
- Part A deductible
- Foreign travel emergency care, up to plan limits
Who actually needs a Medigap plan
Not every Medicare recipient needs supplemental coverage, but it tends to make the most sense if any of the following apply to you:
- You have a chronic condition that requires frequent doctor visits or hospital care
- You travel often and want consistent coverage outside your home state
- You prefer predictable, lower out-of-pocket costs over a lower monthly premium
- You want the flexibility to see any doctor who accepts Medicare, without network restrictions
If you’re someone who rarely visits the doctor and is comfortable taking on more out-of-pocket risk, a Medicare Advantage plan might be a better fit instead, but that’s a separate conversation with different tradeoffs.
Choosing the right plan letter
Medigap plans are labeled with letters (A, B, C, D, F, G, K, L, M, N), each covering a different combination of costs. As of 2026, Plans G and N remain two of the most commonly chosen options for new enrollees, since Plans C and F are no longer available to people who became eligible for Medicare on or after January 1, 2020.
Plan G tends to offer the most comprehensive coverage available to new enrollees, while Plan N offers a lower premium in exchange for small copays on certain office visits and ER trips.
Plan G at a glance
- Covers Part B coinsurance in full
- Covers the Part A deductible
- Does not cover the Part B deductible, which is set annually by Medicare
- Generally comes with a higher monthly premium than Plan N
Plan N at a glance
- Lower monthly premium than Plan G
- Requires small copays for some doctor visits and emergency room trips
- Covers the Part A deductible
- A good fit if you want lower fixed costs and don’t mind occasional small copays
Timing matters more than people expect
The best time to enroll in a Medigap plan is during your six-month Medigap Open Enrollment Period, which starts the month you’re both 65 and enrolled in Part B. During this window, insurers can’t deny you coverage or charge you more based on health conditions.
Miss that window, and in most states, insurers can use medical underwriting, meaning your health history could affect your premium or even your eligibility. Texas has some additional protections, but they’re not the same as guaranteed issue, so timing is genuinely one of the most important factors here.
How Aimbest helps
We’re not tied to one insurance company, so when you talk to us about Medigap, we’re comparing real options across top-rated carriers, not pushing a single product. After 43 years serving Texas families, we’ve seen which carriers handle claims well and which ones don’t, and we’ll tell you the difference.
If you’re approaching 65, already enrolled in Medicare, or helping a parent navigate this decision, a quick call can save you from a coverage gap you didn’t know you had.
Ready to talk it through? Talk to a licensed Texas advisor or get a free quote to see your options side by side.