Plenty of North Texans on Original Medicare discover the program’s sharp edge the first time a hospital bill arrives: Medicare paid its share, and the deductibles, coinsurance and 20 percent slices left over landed on the kitchen table. Medicare Supplement insurance, better known as Medigap, exists to catch exactly those leftovers. It is also one of the most persistently misunderstood products sold to older Texans, partly because its name sounds like everything else in the Medicare aisle.
This is the plain version: what Medigap is and is not, how the lettered plans work, when the one golden buying window opens, and how to shop it in Texas without getting steered.
What Medigap actually does
A Medigap policy is private insurance that pays after Original Medicare pays, covering some or most of your out-of-pocket costs: deductibles, copayments and coinsurance. The policies are sold by private insurers licensed by the state, but the benefits themselves are standardized by the federal government, a structure the Texas Department of Insurance explains in its Medicare supplement guide. You must have both Medicare Part A and Part B to buy one, and the policy travels with Original Medicare: generally, any doctor or hospital in the country that takes Medicare takes your Medigap plan with it, no networks, no referrals.
Two things Medigap is not. It is not a Medicare Advantage plan; in fact you cannot use a Medigap policy with one, since Advantage replaces Original Medicare’s payment structure rather than supplementing it. And it does not cover prescription drugs; that is a separate Part D decision.
The letters, decoded
Medigap plans come in standardized lettered versions, Plan A through Plan N, and the letter defines the benefits exactly. Plan G from one company covers precisely what Plan G from another company covers; the only differences are the premium and the insurer’s service. Medicare.gov’s plan-benefit comparison chart lays out the grid: every plan covers Part A hospital coinsurance, the fuller plans pick up the Part A deductible and the Part B 20 percent coinsurance, and a couple of versions use cost-sharing or high-deductible designs in exchange for lower premiums.
One date matters in the fine print: people who became eligible for Medicare on or after January 1, 2020 cannot buy Plans C or F, the versions that covered the Part B deductible. For the newly eligible, Plans G and N have become the workhorses, and G is essentially the modern F minus that one deductible.
The standardization is the shopper’s best weapon. Once you pick a letter, the decision collapses to price and reputation, which means the right question at every quote is simply: what do you charge for Plan G, and how have your rates trended?
The six-month window that changes everything
Here is the single most important sentence in this article: when you are 65 or older and first enrolled in Medicare Part B, a one-time, six-month Medigap open enrollment period begins, and during it insurers must sell you a policy regardless of your health history. No medical underwriting, no declines, no rate-up for your diabetes or your heart stent. TDI’s guide walks through this window, and it does not repeat annually the way the fall Medicare enrollment period does. Miss it, and in most situations a Texas insurer can later ask health questions and say no.
That is why the standard advice from counselors is blunt: if you want Medigap, buy it inside the window. It is also why anyone leaving an employer plan at 66 or 67 should check how their Part B start date interacts with the window before assuming they still have one.
Shopping it in Texas without getting steered
Premiums for the identical letter vary widely between companies, so quotes from several insurers are not optional homework, they are the whole game. TDI’s consumer pages explain the pricing structures insurers use and publish shopping help, and its consumer help line at 800-252-3439 answers questions about specific companies’ complaint records. For one-on-one, no-sales-pitch help, Texas runs free counseling for people with Medicare through the state’s Health Information, Counseling and Advocacy Program, reachable via Texas Health and Human Services, with counselors who will sit with you, or your parent, and compare actual quotes.
Be wary of any pitch that blurs the line between Medigap and Advantage, or that urges replacing an old Medigap policy without a careful comparison; replacement is sometimes sensible and sometimes a commission in search of a justification. The Medicare.gov Medigap pages are the neutral reference to check every claim against.
Whether it is worth it
The honest answer: it depends on how much unpredictability your budget can absorb. A Medigap premium is a fixed monthly cost that buys away most surprise bills; skipping it keeps the premium and accepts open-ended cost-sharing. People who travel, split the year between Texas and grandkids elsewhere, or simply want any-doctor flexibility tend to value the product most. People confident in a strong local Advantage plan’s network make the other choice. What nobody should do is decide by default, because the six-month clock runs whether you are paying attention or not. If your 65th birthday, or a spouse’s, is on the horizon, put this decision on the calendar next to the party.
This article was produced with AI assistance and reviewed by a human editor. Figures are linked to their primary sources; where a claim could not be verified from the public record, we say so.
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