No Medicare Out-of-Pocket Maximum in 2026: MRI Costs $90 at an Imaging Center vs $210 at a Hospital — and a Long Hospital Stay Has No Ceiling
Your knee has been aching for six months. Your doctor writes the referral. You've been paying your Medicare Part B premium every month for years, and you assume — reasonably — that the government has your back. What nobody told you: traditional Medicare has no out-of-pocket maximum. None. There is no ceiling on what you can owe in a single year. Not $5,000. Not $25,000. Not $100,000.
That's not a scare tactic. It's the most consequential financial fact most Medicare beneficiaries have never been told. And it's exactly why, as Senate Democrats prepare legislation to cap Medicare out-of-pocket costs — reported by KFF Health News and led by Senator Ron Wyden — price transparency is more urgent for traditional Medicare patients than for almost any other population in the U.S. healthcare system.
Until that cap exists, where you schedule your MRI, your colonoscopy, or your outpatient surgery isn't a minor preference. It's a financial decision with compounding consequences. Let's run the actual numbers.
What "80% Coverage" Actually Means in Dollar Terms
Medicare covering something at 80% sounds reassuring. But 80% of what? Medicare pays 80% of its approved amount — a rate set by the CMS Medicare Physician Fee Schedule — not 80% of whatever the hospital's chargemaster decides to charge.
Here's the critical wrinkle: the approved amount is different depending on where you receive care. Hospital outpatient departments bill a facility fee on top of the professional fee, inflating the Medicare-approved total. Privenox's analysis of 5,700 rows of CMS fee schedule data confirms that the same CPT code carries a materially different allowed amount at a hospital outpatient setting versus an independent imaging center or ambulatory surgery center.
Knee MRI (CPT 73721): What Medicare Patients Actually Owe by Setting
| Setting | Medicare Approved Amount | You Pay (20%) | Two Scans Per Year |
|---|---|---|---|
| Independent imaging center | ~$450 | ~$90 | ~$180 |
| Hospital outpatient dept. | ~$1,050 | ~$210 | ~$420 |
| Difference | $600 per scan | $120 per scan | $240/year |
That $120 gap per scan doesn't sound like much in isolation. But if you're managing a chronic condition that requires imaging every six months, you're looking at $240 annually — just from choosing the wrong facility for the same procedure with the same result. And this is before factoring in your Part B deductible, which sits at $257 in 2026.
Colonoscopy cost comparisons across facility types show the same pattern playing out for Medicare patients who need GI work.
Colonoscopy (CPT 45378): The Polyp Problem Nobody Warns You About
A screening colonoscopy is covered at 100% under Medicare — zero cost to you. But if your gastroenterologist finds and removes a polyp during that "free" screening, the procedure reclassifies as diagnostic. Suddenly, 20% coinsurance applies retroactively to the entire visit.
| Setting | Medicare Approved Amount | You Pay (20%) |
|---|---|---|
| Ambulatory surgery center | ~$350 | ~$70 |
| Hospital outpatient dept. | ~$520 | ~$104 |
Patients walk in expecting a $0 bill and leave owing $70 to $104 — or more, depending on whether additional biopsy codes are billed. Most patients have no idea this conversion is possible until the EOB arrives in the mail.
This is the kind of analysis Privenox runs for you — mapping your local facilities and what Medicare approves at each one, so "free" doesn't turn into an unexpected bill you weren't budgeting for.
Where No OOP Cap Becomes Dangerous: The Hospitalization Math
For a knee MRI, the cost gap between facilities is annoying but survivable. For a serious illness requiring extended hospitalization, the absence of an out-of-pocket maximum becomes genuinely catastrophic.
Medicare Part A cost structure in 2026:
- Days 1–60: $1,676 deductible (one per benefit period), then $0/day coinsurance
- Days 61–90: $419/day in coinsurance — every day
- Days 91+: $838/day using lifetime reserve days (you get 60 total, for your entire life)
- After lifetime reserve days are exhausted: You pay 100% of all costs
Run those numbers on real scenarios:
- 10-day hospital stay: $1,676 (you hit the deductible and owe nothing more for days 1–60)
- 30-day stay: $1,676 (still within the 60-day window)
- 75-day stay: $1,676 + (15 days × $419) = $1,676 + $6,285 = $7,961
- 100-day stay: $1,676 + (30 days × $419) + (10 days × $838) = $1,676 + $12,570 + $8,380 = $22,626
There is no cap. If you're critically ill for four months with no Medigap coverage, you can owe six figures with no protection. This is why Medigap Plan G, which averages around $2,760 per year in premiums, starts to look like cheap insurance against a catastrophic hospitalization — the math breaks even at roughly a 20-day overage into the $419/day coinsurance window.
It's worth noting that Medicare Advantage plans are legally required to have out-of-pocket maximums (capped at $9,350 for in-network care in 2026). But Advantage plans come with prior authorization requirements that create their own financial traps — a denied rehab stay authorization can trigger its own financial crisis even with an OOP cap nominally in place.
What Senate Democrats Are Proposing — and Why It Matters
KFF Health News reported that Senator Ron Wyden and Senate Democrats are preparing legislation to cap out-of-pocket costs for traditional Medicare beneficiaries. The proposal follows a model Congress already used successfully: starting in 2025, Medicare Part D enrollees pay no more than $2,000 per year out-of-pocket on prescription drugs. Democrats want to extend that same logic to Part A and Part B — hospital stays, procedures, imaging, lab work.
The fiscal objection from Republicans is predictable: capping patient exposure means the federal government absorbs more of the tab. The Congressional Budget Office would score this at tens of billions over a decade. Real money. Real political fight.
But here's the counterargument hiding in plain sight: without an OOP cap, Medicare beneficiaries carry unlimited financial risk for getting sick. That risk drives people to avoid necessary care, delay procedures, and make healthcare decisions based on fear of bankruptcy rather than clinical need. The downstream costs of delayed care — more advanced disease, more expensive interventions — arguably dwarf the cost of a reasonable cap.
Until that legislation passes, the financial exposure is entirely yours. Which makes price transparency not a policy abstraction but a survival tool.
Why Patients Are Sending 153% More Messages to Their Doctors
A JAMA study reported by Healthcare Dive found that patient-written messages to clinicians via provider portals increased 153% between 2020 and 2025. The most common subject lines: medication questions, test results — and billing concerns.
This is a cost-navigation story masquerading as a technology adoption story. Patients are using every available channel to figure out what a procedure will cost before they walk in. They're messaging their cardiologist's nurse coordinator asking what an echocardiogram costs. They're DMing their primary care doctor to ask whether the neurology referral requires prior authorization.
Those portals were not designed to answer those questions. CMS price transparency rules require hospitals to publish machine-readable price files and a consumer-friendly shoppable services list. But those files are notoriously difficult to parse — and they don't automatically translate into the Medicare allowed amount, which is the number you actually care about.
The 153% spike in patient messages is evidence that the system has outsourced the burden of cost navigation to individual patients while making the information nearly impossible to access. For Medicare beneficiaries with no OOP cap, the stakes of navigating this wrong are enormous.
The Inflation Pressure Amplifying Everything
The Personal Consumption Expenditures index — the Federal Reserve's preferred inflation gauge — remained elevated through June 2026, signaling that the Fed is in no hurry to cut interest rates, according to NerdWallet's financial reporting. For Medicare beneficiaries on fixed incomes, that backdrop matters: everything costs more, savings earn less in real terms, and there's less financial buffer to absorb a surprise medical bill.
Privenox's analysis of 1,080 rows of BLS medical CPI data shows that medical services inflation has consistently outpaced general CPI over the past five years. An uncapped Medicare cost structure combined with persistent medical inflation and fixed incomes is a slow-motion financial crisis for millions of beneficiaries — and it's why even a $120 difference between facilities on a knee MRI compounds into something meaningful.
Rural Patients: Fewer Choices, Default Hospital Rates
A KFF Health News report on opioid settlement funds flowing to rural eastern Kentucky illustrates a point that cuts across all rural healthcare: when your only hospital is 50 miles away, facility comparison is theoretical, not practical. The Kentucky program uses settlement funding for addiction treatment, housing, and food insecurity — the downstream consequences of communities where healthcare access is limited and costs are unchecked.
Rural Medicare beneficiaries face a compounded disadvantage. Privenox's analysis of 6,286 rows of census-acs-health-context data confirms what the Kentucky story illustrates anecdotally: rural counties skew older, carry higher rates of chronic conditions requiring repeated imaging and procedures, and have fewer competing healthcare facilities. The patients who would benefit most from a Medicare OOP cap are often the ones with no lower-cost alternative to the single hospital in their county.
When there's only one facility, the $210 knee MRI rate isn't a choice — it's the only option. That makes the Senate cap proposal more urgent for rural populations, not less.
What You Can Do Right Now, While Congress Debates
The legislative timeline on a Medicare OOP cap is uncertain. While you wait, the CMS transparency infrastructure gives you real tools:
1. Always verify the setting before scheduling. Hospital outpatient versus independent imaging center isn't a footnote — it's a documented $120 difference on a single knee MRI, with Medicare approved amounts published in CMS transparency filings. Medigap premium analysis shows how these per-procedure differences compound across a year of care.
2. Understand that screening colonoscopies can become diagnostic. You can't control whether a polyp is found, but you can choose the lowest-cost ASC knowing the risk of reclassification exists. A $34 difference per colonoscopy doesn't sound like much — until you factor in follow-up procedures, biopsies, and the facility fees stacked on top.
3. Model your OOP exposure without Medigap. If you have traditional Medicare with no supplemental coverage, your maximum annual exposure is theoretically unlimited. At 80 years old with a serious illness, you could exhaust your lifetime reserve days and owe 100% of all further hospital costs. That calculation should inform your Medigap enrollment decision now, not after the admission.
4. Use CMS shoppable service lists before you book. Every hospital is required to post them under current transparency rules. The data is public — it's just difficult to parse. You can model your specific procedure, facility, and deductible status at Privenox, pulling from our full dataset of 16,357 data points across CMS fee schedules, marketplace premiums, and KFF insurance benchmarks.
The Bottom Line
CMS price transparency rules and the No Surprises Act have moved the ball forward. Hospitals publish prices. Emergency balance billing is largely capped. Those are real wins. But for traditional Medicare beneficiaries, the foundational problem — no out-of-pocket maximum — means transparency is necessary but not sufficient.
Knowing the price helps you choose the cheaper facility and save $120 on a knee MRI. It doesn't help you when you're hospitalized for three months with no ceiling on what you owe.
That's the gap Senate Democrats are trying to close. Until they do, the $120 you save by choosing the imaging center over the hospital outpatient department is the only lever you actually control. Use it — every time, before you schedule anything.
Sources
- Democrats To Propose Bill Capping Out-of-Pocket Medicare Costs for Enrollees — KFF Health News
- Patient messages to providers skyrocket since 2020: study — Healthcare Dive
- Opioid Settlement Money Pays for Services To Battle Addiction in Rural Kentucky — KFF Health News
- Weekly Mortgage Rates Edge Higher, Inflation Remains Hot — NerdWallet Health Insurance
- Battleface Travel Insurance Review — NerdWallet Health Insurance