Utah · Medicare Supplement plans and Intermountain Health
Does Intermountain Health Accept Medicare Supplement Plans?
Yes, and the reason is worth understanding, because it is not the reason people expect. A Medicare Supplement is not an insurance plan a hospital signs up with. It pays after Original Medicare, on the same claim, so it works wherever Medicare works, and every one of the 15 Utah hospitals carrying the Intermountain name is on CMS's list of Medicare-certified hospitals. The question that actually matters is a smaller one, and it is about the doctor, not the building.
The bottom line
- A Medigap policy has no network to be in. Medicare.gov: "Medicare will pay its share of the Medicare-approved amount ... Then, your Medigap policy will pay your doctor whatever amount you owe under your policy." If Medicare pays, the supplement pays.
- Intermountain takes Medicare. All 15 Utah hospitals with "Intermountain" in their CMS-registered name are in the CMS Hospital General Information file, 7 of them rated 5 stars. Intermountain's Utah insurance page: "We accept all major insurance plans."
- The real check is assignment, per physician. A non-participating doctor can bill up to 15% above the approved amount; Plans F and G cover that excess, Plan N does not. Medicare.gov says most providers accept assignment; "always check."
- Opting out is rare in Utah, and rarer still in primary care. CMS's opt-out file holds 674 Utah affidavits, 29 of them primary-care physicians; most are behavioral-health clinicians. A supplement pays nothing behind an opted-out provider.
- Where the answer differs: Medicare Advantage networks are set carrier by carrier and year by year, which is the question our Utah Advantage networks post covers. This post is the other half.
Here is how the question reaches me, usually from someone moving to Utah or leaving an Advantage plan: "I'm looking at a Plan G. Does Intermountain take it?" It is a fair question, because for the last decade the Medicare conversation in Utah has been about networks: which Advantage plans include Intermountain, which include University of Utah Health, what happens when a contract fails in July. A supplement sits outside that conversation entirely, and the habit of asking "is it in network" is the habit to unlearn. What follows is the answer in Medicare.gov's words, the CMS data on Intermountain's Utah hospitals, and the one check that still matters.
Why "does the hospital accept Medigap" is the wrong question
A Medicare Advantage plan replaces how you get Medicare; the hospital contracts with the plan, and the plan pays the hospital. A Medicare Supplement does neither. Medicare.gov's description is a sequence: "If you have a Medigap policy and get care, Medicare will pay its share of the Medicare-approved amount for covered health care costs. ... Then, your Medigap policy will pay your doctor whatever amount you owe under your policy and you're responsible for any costs that are left." The hospital bills Medicare. Medicare pays and, in most policies, forwards the claim to your supplement automatically. The supplement pays its part. At no point does the hospital decide whether to "accept" the supplement, because the supplement is not the thing being billed.
That is also why the plan letters are standardized. Medicare.gov: "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." A Plan G bought in Moab pays the same way at Intermountain Medical Center in Murray as it does at St. Mary's in Grand Junction or at a clinic in Phoenix. The only Medigap product with a provider list is Medicare SELECT, which Medicare.gov describes as a policy that "may require you to use certain providers" for a lower premium. If your card does not say SELECT, you do not have one.
Intermountain's Utah hospitals on the CMS Medicare list
The CMS Hospital General Information file is the federal list of hospitals registered with Medicare, with each hospital's type and overall star rating. As of the July 22, 2026 update it holds 52 Utah hospitals. These are the 15 whose registered name includes "Intermountain," which is the primary-source answer to "does Intermountain take Medicare."
| Hospital | City | County | Type | CMS overall rating |
|---|---|---|---|---|
| Intermountain Medical Center | Murray | Salt Lake | Acute Care | 5 stars |
| Alta View Hospital | Sandy | Salt Lake | Acute Care | 5 stars |
| Riverton Hospital | Riverton | Salt Lake | Acute Care | 5 stars |
| Layton Hospital | Layton | Davis | Acute Care | 5 stars |
| McKay-Dee Hospital | Ogden | Weber | Acute Care | 5 stars |
| Logan Regional Hospital | Logan | Cache | Acute Care | 5 stars |
| Utah Valley Hospital | Provo | Utah | Acute Care | 5 stars |
| Spanish Fork Hospital | Spanish Fork | Utah | Acute Care | Not rated (CAH) |
| Sevier Valley Hospital | Richfield | Sevier | Acute Care | 4 stars |
| Cedar City Hospital | Cedar City | Iron | Acute Care | 3 stars |
| Heber Valley Hospital | Heber City | Wasatch | Critical Access | Not rated (CAH) |
| Sanpete Valley Hospital | Mount Pleasant | Sanpete | Critical Access | Not rated (CAH) |
| Delta Community Hospital | Delta | Millard | Critical Access | Not rated (CAH) |
| Fillmore Community Hospital | Fillmore | Millard | Critical Access | Not rated (CAH) |
| Garfield Memorial Hospital | Panguitch | Garfield | Critical Access | Not rated (CAH) |
Source: CMS Hospital General Information, Utah rows with "Intermountain" in the facility name, updated July 22, 2026. CMS does not assign an overall rating to Critical Access Hospitals; Spanish Fork Hospital's rating is listed as not available.
Read the list as a floor. Several Intermountain facilities are registered under names that do not include the word: St. George Regional Hospital, LDS Hospital and Primary Children's Hospital are all in the same file and all part of the system. The count that matters is not fifteen or twenty; it is that every one of them is certified to bill Medicare, and that 10 of the fifteen are full acute-care hospitals while 5 are Critical Access Hospitals, the 25-bed rural facilities in places like Panguitch and Fillmore where Medicare is, in practice, most of the business. Intermountain's own Utah insurance page says "We accept all major insurance plans," and its billing FAQ says "Intermountain bills all insurance carriers." For a supplement, both statements are almost beside the point: the claim goes to Medicare first.
Comparing a supplement against an Advantage plan for 2027?
Bring your doctors and hospitals by name to our Moab office, or call from anywhere in Utah. We will check each physician's assignment status on Care Compare, read the Advantage plans' 2027 directories for the same names once they are public on October 1, and price the plan letters against each other. Free, no pressure. We do not offer every plan available in your area, and we will tell you when Medicare.gov or 1-800-MEDICARE is the better call.
Book a coverage review →The check that does matter: assignment, doctor by doctor
The hospital's Medicare status settles the facility bill. The physician's status settles the rest, and it comes in three flavors that Medicare.gov lays out. "Most doctors, providers, and suppliers accept assignment, but always check to make sure that yours do." Here is what each status means, and what your supplement does in each case.
| Provider status | What Medicare does | What your Medigap policy does | What you pay | |
|---|---|---|---|---|
| Participating (accepts assignment) | Pays its share of the approved amount; the provider agrees to charge you only the deductible and coinsurance. | Pays your share per your plan letter. If you ask, the company must pay the provider directly. | Nothing beyond what your plan letter leaves — the Part B deductible on Plan G, for example. | Routine |
| Non-participating (enrolled, no assignment) | Still pays its share, but the provider may bill up to 15% above the approved amount — the limiting charge. | Plans F and G pay the excess charge; Plan N and the others do not. | The excess, unless your plan covers it. You may also pay up front and wait for reimbursement. | Ask first |
| Opted out of Medicare | "Medicare won't pay for items or services you get from provider that opts out, except in emergencies." | Pays nothing — a supplement pays after Medicare, and Medicare paid nothing. | The whole bill, under a private contract you sign before care. | Full cost |
Sources: Medicare.gov, Does your provider accept Medicare as full payment?; Medicare.gov, Compare Medigap plan benefits (Part B excess charge row); How Medigap works.
The middle row is the whole reason Plan G exists in its current form. A non-participating provider is enrolled in Medicare and gets paid by Medicare, but "can charge you more than the Medicare-approved amount. In many cases, the charge can't be more than 15% above the Medicare-approved amount for non-participating healthcare providers. This amount is called 'the limiting charge.'" That extra is the "Part B excess charge" on the Medigap benefit chart, and Plans F and G pay it; Plan N does not. Utah has no state law that bars excess charges, as a few states do, so the federal 15% rule is the one that applies at a Utah clinic. We priced the G-versus-N difference in Plan G vs. Plan N; the arithmetic is identical in Utah.
The bottom row is the one a supplement cannot help with. A physician who has opted out of Medicare signs private contracts with patients, and "Medicare won't pay for items or services you get from provider that opts out, except in emergencies." Since your supplement pays after Medicare, it pays nothing. How common is that in Utah? CMS publishes the affidavits. As of the September 21, 2026 file, Utah has 674 of them. Only 29 are primary-care physicians (21 in family practice, 8 in internal medicine), concentrated in Provo, St. George, Salt Lake City, Park City and West Jordan; 487 are behavioral-health clinicians, chiefly clinical social workers and marriage and family therapists; 50 are oral surgeons. There are no affidavits at all from Moab, Monticello or Blanding. If you are choosing a supplement so you can see the Intermountain specialist your Moab doctor refers you to, the opt-out risk is close to nil; where it shows up is concierge and cash-pay practices, which we covered in does Medicare cover concierge medicine in Utah.
Where the Medigap answer and the Advantage answer part ways
In Utah the same hospital system is also, through Select Health, one of the state's Medicare Advantage carriers, and that is where the two questions get tangled. An Advantage plan's network is a contract between one insurer and one health system, for one year, and Intermountain can be in a given plan's network in January and out of it by summer. Our Utah Advantage networks post explains why we will not publish a which-plan-includes-which-hospital list and how to verify it yourself; our University of Utah Health post does the same for the other system. None of that machinery exists on a supplement. There is no directory to search every fall, no service area, no referral from a primary care doctor, and no prior authorization from an insurer; Medicare's own coverage rules decide what is paid.
The trade is the premium, and it is a real one. A supplement costs a monthly premium on top of Part B, and a $0-premium Advantage plan does not, so the supplement is buying you the absence of a network rather than any benefit you can point to on a chart. Whether that is worth it depends on where your care actually happens. For someone whose cardiologist is in Murray, whose orthopedist is in Provo, and who winters in St. George, the supplement removes three network questions at once. For someone whose care stays inside one Wasatch Front system that is reliably in their Advantage plan's network, it may be paying for a freedom they do not use. We worked through that decision in do I really need supplemental insurance with Medicare.
The five checks before a visit
This is the entire pre-visit routine on a supplement. Compare it with the Advantage version, which starts with a directory search and ends with an authorization number.
| Check | How | Why it matters |
|---|---|---|
| 1. Is the hospital or clinic Medicare-certified? | Search it on Care Compare, or check the CMS Hospital General Information file. Every Intermountain-named Utah hospital is there. | Certification is what makes a hospital claim payable by Medicare, and therefore by your supplement. |
| 2. Does the individual physician accept assignment? | Care Compare's provider search shows whether a doctor "accepts Medicare assignment." Ask the clinic's billing office the same question in those words. | Hospital and physician are billed separately. Assignment is a per-provider status, and it decides whether an excess charge is even possible. |
| 3. Which plan letter do you hold? | Look at your Medigap card. F and G cover Part B excess charges; N does not. | If your letter covers the excess, step 2 changes from a cost question to a paperwork question. |
| 4. Give the front desk both cards | Your red, white and blue Medicare card and your Medigap card, every visit. | Most supplements receive the claim automatically from Medicare ("crossover"), but the hospital needs the policy on file to bill any balance correctly. |
| 5. Nothing else | No referral, no prior authorization from an insurer, no network directory, no service area. | Those are Medicare Advantage steps. On Original Medicare with a supplement, the plan's rules are Medicare's rules. |
Sources: Medicare.gov Care Compare; Medicare.gov, provider payment; How Medigap works.
Why this matters most in rural Utah
Grand County has one hospital, Moab Regional, a Critical Access Hospital; San Juan County has two, in Monticello and Blanding. The serious care leaves the county: cardiology, oncology, orthopedics and most surgery run north to the Wasatch Front or west to St. George, much of it to the Intermountain hospitals in the table above. Grand County's CDC PLACES figures put high blood pressure at 33.3% of adults and diabetes at 11.2% (2023), which are exactly the conditions that generate those referrals. On a supplement, a referral to Utah Valley Hospital or Intermountain Medical Center is a drive, not a coverage question. That is the practical case for the product in southeast Utah, and it is the reason a good share of my Moab and Monticello clients hold one. It is not the case for everyone, and it is not a reason to skip the premium comparison; it is the reason the comparison is worth an hour.
What I would do
If you already hold a supplement, stop asking whether Intermountain takes it and start asking, once, whether each of your physicians accepts assignment. Care Compare answers that in a minute per name, and the answer rarely changes. If you hold Plan G or F, even that check is a formality. If you are deciding between a supplement and an Advantage plan for 2027, write down every hospital and doctor you use or expect to use, and run the list two ways: against each Advantage plan's 2027 directory after October 1, and against Care Compare's assignment flag. One of those checks will take you an afternoon every fall. The other you do once. That difference, and the premium, are the decision.
How we know all this: the Medicare On Main Data Desk frames every article with public data — here, the CMS Hospital General Information file (updated July 22, 2026) for Utah's Medicare-registered hospitals, the Intermountain-named subset, their types and ratings; Medicare.gov's How Medigap Works, Medigap basics and Medigap costs pages for the claim sequence, standardization, participating-doctor payment and Medicare SELECT; Medicare.gov's provider-payment page for assignment, the 15% limiting charge and opt-out; Medicare.gov's Medigap benefit chart for the Part B excess charge row; Intermountain Health's Utah insurance page and billing FAQ, quoted as published; the CMS Opt Out Affidavits file (updated September 21, 2026), counted by state, specialty and city on September 24, 2026; and CDC PLACES county data (2023). The opt-out file lists affidavits, not practices, so it is a floor for providers who do not bill Medicare. No Medigap premium is quoted; no carrier or hospital is endorsed or criticized; an individual physician's assignment status is a per-provider fact to confirm on Care Compare or with the practice. Select Health is named only as Intermountain's affiliated insurer, not as a recommendation. 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.
Frequently asked questions
Does Intermountain Health accept Medicare Supplement plans?
Yes, in the only way that question can be answered: Intermountain's Utah hospitals take Medicare, and a Medicare Supplement pays after Medicare on the same claim. All 15 Utah hospitals with "Intermountain" in their CMS-registered name are in the CMS Hospital General Information file, which is the list of hospitals certified to bill Medicare, and Intermountain's own insurance page for Utah says "We accept all major insurance plans." Per Medicare.gov, when you have a Medigap policy, "Medicare will pay its share of the Medicare-approved amount ... Then, your Medigap policy will pay your doctor whatever amount you owe under your policy." There is no separate Medigap network for a hospital to be in or out of.
Do Medicare Supplement plans have a network?
No, with one narrow exception. A standard Medigap policy has no network, no service area and no referral rule; it follows Original Medicare, which covers any provider in the U.S. that takes Medicare. Medicare.gov: policies "with the same letter offer the same basic benefits no matter where you live or which insurance company you buy the policy from." The exception is a Medicare SELECT policy, a Medigap variant that Medicare.gov says "may require you to use certain providers" in exchange for a lower premium. If your card says SELECT, there is a hospital list to check; if it says Plan G, Plan N or any other letter, there is not.
Can a doctor refuse my Medicare Supplement plan?
A doctor can decline Medicare, and then your supplement has nothing to pay after. What a doctor cannot do is take Medicare and turn away your Medigap policy, because the policy is not something the doctor bills; Medicare forwards the claim. Medicare.gov's rule for participating doctors: "If your doctor participates, your Medigap insurance company is required to pay your doctor directly, if you ask them to." The real question to ask any Utah practice is "do you accept Medicare assignment," and the three answers, participating, non-participating and opted out, are the three rows in the table above.
Which Medigap plans cover Part B excess charges?
On Medicare.gov's benefit chart, "Part B excess charge" is a row that Plans F and G cover in full and Plan N does not (Plans A, B, C, D, K, L and M do not either). The excess charge is what a non-participating provider may add above Medicare's approved amount, capped at 15% in most cases. Utah is not one of the handful of states that outlaw excess charges by state law, so the federal rule is the rule here. Medicare.gov says most providers accept assignment, so most people never see an excess charge; the point of Plan G's coverage is that you do not have to check.
Does Intermountain Health take Original Medicare?
Yes. The CMS Hospital General Information file lists 52 Utah hospitals registered with Medicare, and 15 of them carry the Intermountain name, from Intermountain Medical Center in Murray to Garfield Memorial in Panguitch (10 acute care hospitals and 5 Critical Access Hospitals). Other Intermountain facilities appear in the same file under names that do not include the word, St. George Regional Hospital among them, so 15 is a floor, not the whole system. Whether a particular Intermountain physician accepts assignment is a separate, per-provider question, and Care Compare answers it.
Do I need a referral to see an Intermountain specialist with a Medigap plan?
No. Referrals and prior authorization from an insurer are Medicare Advantage features. With Original Medicare and a supplement, you can book directly with any Medicare-participating specialist, and Medicare's own coverage rules, not a plan's, decide what is paid. That is the practical reason many rural Utah retirees whose referrals run to Salt Lake City, Provo or St. George choose a supplement: the Intermountain specialist is reachable from Moab or Monticello without a network, a referral or a service-area question. For the Medicare Advantage side of the same question, read our post on how Utah Advantage networks handle the state's hospital systems.
Sources
- CMS Hospital General Information (data.cms.gov, updated July 22, 2026) — 52 Utah hospitals; the 15 Intermountain-named rows, types and ratings.
- Medicare.gov: How Medigap works — "Medicare will pay its share ... Then, your Medigap policy will pay your doctor"; participating doctors must be paid directly on request.
- Medicare.gov: Medigap basics — standardization "no matter where you live"; Medicare SELECT.
- Medicare.gov: Medigap costs — SELECT policies "may require you to use certain providers."
- Medicare.gov: Does your provider accept Medicare as full payment? — assignment, the 15% limiting charge, opt-out providers.
- Medicare.gov: Compare Medigap plan benefits — the Part B excess charge row.
- Intermountain Health: Insurance plans we accept in Utah — "We accept all major insurance plans."
- Intermountain Health: Insurance accepted at Intermountain (billing FAQ) — "Intermountain bills all insurance carriers."
- CMS Opt Out Affidavits (data.cms.gov, updated September 21, 2026) — 674 Utah affidavits; 29 primary care; 487 behavioral health.
- Medicare.gov Care Compare — per-provider "accepts Medicare assignment" flag.
- CDC PLACES: Local Data for Better Health, County 2023 — Grand County high blood pressure and diabetes prevalence.
