Utah · Medigap in Washington County

Medicare Supplement Plans in St. George, Utah for 2026

Every Medigap letter sold in Utah is sold in St. George, and the benefits inside each letter are identical wherever you buy it. What is local is the price, the windows that let you in without health questions, and the doctors you will use it with. Here is the Medigap side of Washington County, with the enrollment numbers, the 2026 chart figures and the rules, and no premiums invented.

Medicare On Main Data Desk

Published September 25, 2026 · 10 min read · Reviewed by Brian Penner, 22+ years in Medicare

Here is why this post exists next to the Advantage one. Last month we counted Washington County's 12 Medicare Advantage drug plans, and before that the moving Special Enrollment Period. Both were about the half of the county that chose a plan with a network. This one is for the other half, the 23,103 people in Original Medicare, and for the retirees still moving in who have to decide which half to join. Most of the pages that rank for "Medicare supplement plans St. George" are premium tables. I am not going to give you one, because a premium quoted on the internet in September is a premium someone else pays, at their age, with their company, on their pricing method. What I can give you is everything that decides yours.

The St. George market, from CMS's enrollment file

CMS publishes county-level enrollment monthly. Here is Washington County for the last three periods.

Source: CMS Medicare Monthly Enrollment (data.cms.gov), Washington County, Utah. "Medicare Advantage and other plans" is CMS's category and includes a small number of other health-plan types. CMS does not report Medigap enrollment by county; the Original Medicare column is the population a supplement can be sold to.

Three things in that table shape the Medigap conversation in St. George. The county added about 2,066 beneficiaries in two and a half years, and nearly all of the growth went to Advantage plans; Original Medicare slipped from 23,830 to 23,103 while the Advantage count rose by 2,793. The 50% line was crossed in 2025. And the county is still less Advantage-heavy than the plan counts suggest: 12 Advantage drug plans from 5 carriers are filed here, yet 48% of beneficiaries chose none of them. Compare Grand County, where 1,762 of 2,299 beneficiaries, 76.6%, are in Original Medicare with a shelf of 8 plans from 2 carriers. Where the shelf is long, more people take it; where it is short, the supplement is the default.

What the letters cover: the same in St. George as in Sandy

Medicare.gov makes the point that most people miss when they shop by carrier: "All Medigap policies are standardized. This means, policies with the same letter offer the same basic benefits no matter where you live or which insurance company you buy the policy from." And: "Price is the only difference between plans with the same letter that are sold by different insurance companies." Ten letters exist in most states, "A-D, F, G, and K-N"; in practice Utah shoppers weigh these.

Source: Medicare.gov: Compare Medigap plan benefits (2026 chart): Plan N "copayment of up to $20 for some office visits and up to $50 for emergency room visits when you aren't admitted as an inpatient"; high-deductible F and G "$2,950 (in 2026)"; Plan K $8,000 and Plan L $4,000 out-of-pocket limits in 2026; foreign travel emergency "80%" "up to plan limits" on Plans C, D, F, G, M and N. Plan F (and C) are open only to people eligible for Medicare before January 1, 2020.

Every one of those plans also pays the Part A hospital deductible and the skilled-nursing coinsurance in full (Plans K and L at 50% and 75%), which is the part of a bad year that dwarfs the Part B copays. Two structural facts from Medicare.gov's how-it-works page: "A Medigap policy only covers one person," so a couple in Ivins buys two, and a policy sold today "won't include drug coverage," so the household also buys a stand-alone Part D plan, which is why 16,488 Washington County residents hold one.

What decides the premium in the 847 ZIP codes

Medicare.gov's cost page opens with the sentence every St. George shopper should read before a rate table: "Medigap premiums vary widely depending on the insurance company, the plan, and where you live. Each insurance company decides how it will set the price, or premium, for its Medigap policies, which can affect how much you pay now and in the future." Three methods are allowed, and Medicare.gov defines them:

• Community-rated ("no-age-rated"): "the same premium is charged to everyone regardless of age or sex." Your premium "isn't based on your age. Premiums may go up because of inflation and other factors, but not because of your age."
• Issue-age-rated ("entry-age-rated"): the premium is based on the age you are when you buy the policy, so buying at 65 locks a lower starting point than buying at 72, and later increases are not for age.
• Attained-age-rated: "The premium is based on your current age, so your premium goes up as you get older." Medicare.gov's caution: these "may be the least expensive at first, but they can eventually become the most expensive."

On top of the method, the page lists what else moves the number: whether the company "Offers discounts (like discounts for women, non-smokers, or married people; discounts for paying yearly; discounts for paying your premiums using electronic funds transfer ..., or discounts for multiple policies)," whether it "Uses medical underwriting or charges a different premium when you don't have a guaranteed issue right or aren't in your Medigap Open Enrollment Period," and whether it "Sells Medicare SELECT policies that may require you to use certain providers," which cost less and, for a St. George household that uses Las Vegas specialists, deserve a careful read of the network. And the closing line: "Premium amounts typically increase each year." We wrote about why in the premium-increase post.

Where to see actual numbers: the Utah Insurance Department's Medicare supplement comparison and Medicare.gov's Medigap finder, both by ZIP, both estimates. Then a quote from the company or an agent, because the estimate does not know your discounts.

The doors into a supplement in Washington County

A Medigap company has to sell to you without health questions only on certain days. In a county where a large share of new residents arrive already on Medicare, the second row of this table is the one that matters most and gets missed most.

Sources: Medicare.gov: When can I buy Medigap? (open enrollment and guaranteed-issue answers); Utah Code § 31A-22-620(3)(g) — Medicare supplement birthday window. Plans C and F only for people eligible for Medicare before 2020; where Medicare.gov lists "A, B, C, D, F, G, K, or L," a newer beneficiary's list is A, B, D, G, K or L.

Turning 65 in St. George. Medicare.gov: "The best time to buy a Medigap policy is during your Medigap Open Enrollment Period. This is the 6-month period that starts the first day of the month you're 65 or older and signed up for Part B. After this period, your options to buy a Medigap policy may be limited and the policy may cost more." Note the trigger is Part B, not the birthday; someone who keeps employer coverage to 68 and then enrolls in Part B gets the six months at 68.

Arriving on an Advantage plan. This is the St. George case. A couple sells the house in Henderson or Mesa and lands in Washington County on a Nevada or Arizona Advantage plan whose service area does not include Utah. Medicare.gov's answer for that situation: "You can buy Medigap Plan A, B, C, D, F, G, K, or L that's sold by an insurance company in your state if you switch to Original Medicare. You must apply for a Medigap policy: 60 days before the date your Medicare Advantage Plan coverage ends. No more than 63 days after your Medicare Advantage Plan coverage ends. You only have this right if you switch to Original Medicare (rather than joining another Medicare Advantage Plan)." Two consequences. The move gives you a real, underwriting-free path into Plan G at any age and in any health, which a 74-year-old with a cardiac history cannot otherwise get in Utah. And the path closes the moment you enroll in one of the 12 local Advantage plans instead; the moving Special Enrollment Period for Advantage plans and this Medigap right run on different clocks and are mutually exclusive in outcome.

Arriving on a Medigap policy. Keep it. A supplement is not tied to a service area, and the company cannot cancel it for moving. Two calls before the truck: ask what the premium becomes at a Utah address, since "where you live" is one of Medicare.gov's three pricing inputs, and ask whether the policy is a Medicare SELECT policy with a network, which does give rights when you leave its area.

Already here, already on Medigap. Utah's birthday rule, Utah Code § 31A-22-620(3)(g): "Each year, beginning on an enrollee's birthday and ending 60 days later, an issuer shall allow an enrollee that is enrolled in one of the issuer's Medicare supplement insurance plans to choose a different Medicare supplement insurance plan that is: (A) offered by the issuer; and (B) considered a comparable or lower tier plan," and "may not deny enrollment based on medical underwriting" for that switch. Same company, sideways or down. Plan G to Plan N or to high-deductible G qualifies; Plan N to Plan G does not, and neither does a move to a different company. The scenarios are worked through in the switching post.

Using it in St. George: hospitals, assignment, and the drive

A supplement has no directory to check, because it has no network. Medicare.gov describes the claim: "Medicare will pay its share of the Medicare-approved amount for covered health care costs. In most Medigap policies, you agree to have the Medigap insurance company get your Part B claim information directly from Medicare. Then, your Medigap policy will pay your doctor whatever amount you owe under your policy." The hospital's contract is with Medicare, not the supplement company. In the CMS hospital file, St. George Regional Hospital is an acute-care, non-profit hospital with a 5-star overall rating; Cedar City Hospital up I-15 is acute care with a 3-star rating; Kane County Hospital in Kanab is a critical-access hospital. All three bill Original Medicare, and a Plan G pays behind all three. So does a hospital in Las Vegas, Salt Lake City or Rochester, Minnesota, which is the case we covered in the out-of-state specialty-care post.

The check that does exist is physician by physician: assignment. A participating doctor accepts Medicare's approved amount; a non-participating doctor may bill up to 15% more, the "Part B excess charge" that Plan G covers and Plan N does not; and a doctor who has opted out of Medicare bills you privately, and neither Medicare nor the supplement pays. To size that last risk locally, we read the CMS Opt Out Affidavits file for Utah on September 25. It holds 38 affidavits with a St. George, Ivins, Washington or Hurricane address. Ten are clinical social workers, seven nurse practitioners, six oral surgeons, three marriage and family therapists; the physicians are two in internal medicine, one in family practice, one rheumatologist. That is 3 primary-care physicians in a county of 48,139 beneficiaries, and a file of affidavits is a floor, not a directory. The practical point: "Do you accept Medicare assignment?" is a one-question call, and for the overwhelming majority of St. George practices the answer is yes. The Intermountain post walks the same tiers for the whole state.

Then the drive, which for St. George means Mesquite and Las Vegas as often as Salt Lake. A supplement crosses the state line at no change in benefit. For the household that leaves the country, the chart's foreign travel emergency line pays 80% "up to plan limits" on Plans C, D, F, G, M and N, a benefit an Advantage plan may or may not carry and one worth reading in the policy before a cruise.

The drug plan that goes with it

A supplement and Original Medicare cover no prescriptions. Of Washington County's 39,281 beneficiaries with Part D coverage in June 2026, 16,488 hold a stand-alone drug plan, which is the Original Medicare crowd, and 22,793 get drugs through an Advantage plan. The stand-alone plans are filed by region, not county, so the whole state sees the same list; the 2026 out-of-pocket cap of $2,100 applies on every one of them, and the pharmacy-network question, which is real in southern Utah, is answered in the preferred-pharmacy post. The total monthly cost of the Original Medicare package is the $202.90 Part B premium for most people in 2026, the supplement premium, and the drug plan premium; the Advantage package is the Part B premium plus, on 7 of the county's 12 plans, a $0 plan premium, with cost sharing up to a maximum of $5,000 to $6,750 a year. That is the comparison, and it is a spreadsheet, not a slogan.

What I would do

If you are turning 65 in Washington County this year, use the six months. Compare Plan G and Plan N by the same-letter price across companies, ask each company which pricing method it uses, and buy the drug plan the same week. If you are moving in on an Advantage plan and want a supplement, count the 63 days from the day the old plan ends and apply inside them, to Original Medicare, before you so much as look at the local Advantage shelf, because that look can cost you the right. If you are moving in on a supplement, keep it and re-price it at the new address. If you are already here on a supplement and the premium has outgrown you, wait for your birthday and move sideways within your company, or price a high-deductible G against what a bad year would cost. And if your specialists are in Las Vegas, the absence of a network is not a footnote; it is the reason 23,103 of your neighbors are still in Original Medicare.

One Grand County note, since that is where our Utah office sits. Moab's shelf is 8 plans from 2 carriers, and 76.6% of Grand County beneficiaries are in Original Medicare; 33.3% of adults here live with high blood pressure and 11.2% with diabetes, per CDC PLACES, and the specialty care for both is a drive to Grand Junction or Salt Lake. Everything above about assignment, the drive and the birthday window applies word for word at 880 S Main.

How we know all this: the Medicare On Main Data Desk frames every article with public data — here, the CMS Medicare Monthly Enrollment file for Washington and Grand County beneficiary counts by coverage type (2024, 2025 and June 2026); Medicare.gov's Medigap basics, how-it-works, costs, when-to-buy and benefit-chart pages for the standardization rule, the claim sequence, the three pricing methods, the discount list, the six-month window, the guaranteed-issue and trial-right answers, and every 2026 chart figure, quoted as published; Utah Code § 31A-22-620(3)(g) for the birthday window, quoted as published; the CMS Hospital General Information file for St. George Regional, Cedar City and Kane County hospitals; the CMS Opt Out Affidavits file (read September 25, 2026) for Washington County counts; the CMS fact sheet of November 14, 2025 for the 2026 Part B premium and deductible and Medicare.gov for the 2026 Part D cap; the CMS CY2026 landscape file for Washington and Grand County Advantage plan counts; and CDC PLACES county data (2023). No Medigap premium is quoted, because none can be stated honestly without a company, an age, a ZIP and a pricing method; no carrier is named, endorsed or criticized. This is education, not advice; confirm plans, costs and eligibility with a licensed agent or Medicare.gov. We take no payment from any carrier to feature a plan.