Knee MRI Out-of-Pocket Cost: $400 at an Imaging Center vs $4,200 at a Hospital — What You'll Owe at a $1,500 vs $4,000 Deductible

Your doctor says you need a knee MRI. The order goes to the front desk, and someone asks, "Where would you like to schedule?" Most of us pick whatever is closest or whatever the office suggests. Nobody mentions that the same scan, billed under the same code, can cost you $80 or $840 depending on the door you walk through.

That gap is what this post is about. I spent ten years in hospital revenue cycle work, and the pattern I saw most often is simple. Patients don't overpay because they're careless. They overpay because the price isn't visible until the bill arrives.

Below I'll show a worked example with four price points and three deductible situations. Then I'll show how a small premium savings can vanish in one scan, and give you a short list of questions to ask before you book.

Why premiums and deductibles are the story right now

KFF Health News' piece "Sticker Shock at the Doctor's Office Could Motivate Midterm Voters" reports that steep jumps in health insurance premiums and deductibles are top of mind for many voters heading into the midterm elections. Chief Washington correspondent Julie Rovner also lays out where candidates on both sides stand on affordability.

That framing matches what I see in the data. Premiums are the number you see once a year. Deductibles and coinsurance are the numbers you feel at the moment of care. Privenox's data layer (16,357 rows across six sources) tracks both sides. The aca-marketplace-premiums dataset (3,060 rows, built from CMS marketplace public use files) covers what you pay to hold a plan. The kff-insurance-benchmarks dataset (200 rows, drawn from KFF's Employer Health Benefits Survey) covers what employer plans ask you to cover before they pay. The bls-medical-cpi dataset (1,080 rows) shows how medical prices have moved over time.

None of those datasets can tell you what your MRI costs at your local facility. That depends on your plan's negotiated rate with each facility. I'll get to how to find it.

Same CPT code, four different prices

A knee MRI without contrast is billed under CPT 73721, the code for an MRI of a lower-extremity joint without contrast. You'll find it in the CMS Physician Fee Schedule, which is the source behind our cms-fee-schedule dataset (5,700 rows). The fee schedule splits the service into two pieces:

Technical component: the machine, the technologist, the room and the equipment.
Professional component: the radiologist's read of the images.

The two parts can be billed separately. When the scan is done in a hospital outpatient department, the hospital can also add a facility fee on top of the technical piece. A hospital carries overhead an independent imaging center doesn't, such as around-the-clock emergency capacity, so this isn't villainy. It is, however, a real reason the same scan lands at different prices.

Here is an illustrative scenario for a knee MRI at four facilities within driving distance. These are example negotiated rates I built to show the math, not quotes from any real facility. Swap in your own.

Facility type	Your plan's allowed amount
Independent imaging center	$400
Physician-owned outpatient radiology group	$850
Community hospital outpatient department	$2,100
Academic medical center outpatient department	$4,200

That's a 10.5x spread for one CPT code. If you've ever thought, "Why did my MRI cost $4,000 when my neighbor paid $400?", this table is usually the answer. Your neighbor probably wasn't luckier. They probably went to a different row.

This is the kind of comparison Privenox is built to run for you, so you don't have to call four billing offices to build the table yourself.

What you'll actually owe: the deductible changes everything

The allowed amount isn't your bill. What you owe depends on where you are in your deductible. Quick translation:

Allowed amount: the price your insurer has agreed to with that facility.
Deductible: what you pay in full before the plan starts sharing costs.
Coinsurance: your percentage of the cost once the deductible is met.

For a step-by-step reading of an explanation of benefits (EOB), see What You Owe After an MRI: Deductible, Coinsurance, and EOB Explained.

Now the math. I'm assuming 20% coinsurance, in-network care and no copay for the scan.

Facility	Allowed	Deductible already met	$1,500 deductible, $0 met	$4,000 deductible, $0 met
Imaging center	$400	$80	$400	$400
Radiology group	$850	$170	$850	$850
Community hospital	$2,100	$420	$1,620	$2,100
Academic hospital	$4,200	$840	$2,040	$4,040

Two of these calculations, so you can check my work:

Academic hospital, $1,500 deductible unmet: you pay the first $1,500, then 20% of the remaining $2,700 ($540). Total: $2,040.
Academic hospital, $4,000 deductible unmet: you pay $4,000, then 20% of the last $200 ($40). Total: $4,040.

Look at the gap between the cheapest and most expensive option in each column:

Deductible already met: $760
$1,500 deductible unmet: $1,640
$4,000 deductible unmet: $3,640

The higher your deductible and the less of it you've used, the more the facility choice matters. A plan with a big deductible turns the price gap into money you pay yourself instead of money your insurer absorbs. Our post on what you'll pay for an MRI, colonoscopy and lab work at $1,650, $3,200 and $6,000 deductible levels shows the same pattern across other procedures.

The value of shopping among four facilities

Suppose you picked one of the four facilities at random. With the $4,000 deductible unmet, your expected cost would be the average of the last column:

(400 + 850 + 2,100 + 4,040) ÷ 4 = $1,847.50

Picking the cheapest option instead saves you $1,447.50 versus a random pick and $3,640 versus the most expensive. With the $1,500 deductible unmet, the average is $1,227.50, so the cheapest option saves $827.50 versus a random pick.

That's the return on a few phone calls or a few minutes with a price tool, and it's why I want you thinking about price before you schedule.

Mid-year math: how much deductible do you have left?

It's September 21, so many of you are somewhere in the middle of your deductible. Say you have a $1,500 deductible and have already paid $1,000, leaving $500. The same scan costs:

Imaging center: $400 (all within your remaining deductible)
Radiology group: $500 + 20% of $350 = $570
Community hospital: $500 + 20% of $1,600 = $820
Academic hospital: $500 + 20% of $3,700 = $1,240

Even with most of your deductible behind you, the spread is still $840 between the cheapest and priciest option.

If your timing is flexible: December vs. January

Deductibles typically reset on January 1. If you've already met your deductible this year, the same scan at the academic hospital costs $840 in December and $2,040 in January. That's a $1,200 difference from the calendar alone. At the imaging center, it's $80 versus $400, a $320 difference.

To be clear, I'm not suggesting anyone delay care. If your doctor wants the scan now, get the scan. But if your clinician says the timing is flexible, it's fair to ask whether the date matters. The calendar can change your bill as much as the facility does.

The premium trap: saving $600 a year, risking $2,000 in one scan

Open enrollment for ACA marketplace plans typically begins November 1, and many employers run their own windows this fall. If premiums have jumped, as KFF Health News reports voters are seeing, a higher-deductible plan is tempting.

Here's an illustrative trade. Moving from a $1,500 to a $4,000 deductible saves $50 a month in premium, or $600 a year. Your extra exposure is $2,500. What that costs you depends on where you get care:

Where you get the MRI	Cost on $1,500 plan	Cost on $4,000 plan	Extra cost of the cheaper plan
Imaging center	$400	$400	$0 (you're $600 ahead)
Academic hospital	$2,040	$4,040	$2,000 (you're $1,400 behind)

At the imaging center, the high-deductible plan wins by $600. At the academic hospital, one scan wipes out more than three years of premium savings ($2,000 ÷ $600 ≈ 3.3 years). Same plans, same procedure, opposite conclusion, and the only variable that changed was where you booked.

That's why the sensible way to compare plans isn't just monthly premium. Compare it against the procedures you're likely to need and the price range of the facilities near you. For a closer look at how plan type changes the numbers, see our knee MRI cost at a $4,000 deductible comparison.

Cash price vs. running it through insurance

One more wrinkle. Some imaging centers offer a cash price. If it's $400 and your insurance would also allow $400, it usually makes sense to run it through insurance while your deductible is unmet, because those dollars count toward your deductible and cash payments typically don't.

If the cash price is lower than your allowed amount, the math flips, and it's worth asking. Our guide to paying $400 for an MRI that costs $3,500 at the hospital walks through cash pay, charity care and bill negotiation.

What a hotel stay and car insurance teach us about healthcare pricing

Two of the NerdWallet articles in this week's reading list aren't about healthcare. They still illustrate something useful, so a quick detour.

NerdWallet's sponsored piece "How I Turned $99 Into a $6,205.32 Luxury Resort Stay" describes how one traveler used a credit card's fourth-night-free perk to cut the cost of a resort stay. I'm not endorsing the card. The takeaway is that a room's real price depends on which rules you apply, and the sticker price is only where the story starts.

NerdWallet's "Guide to Usage-Based Car Insurance" notes that this kind of policy can lower costs for safe drivers but that not everyone will get cheaper rates. Your own inputs decide the result.

Healthcare works the same way, with one important difference. With a hotel or a car policy, you can see the price before you commit. With a scan, you often can't, and that's the system's problem, not yours. Both examples still point to the same habit: plug in your own variables before you buy.

Before you schedule: five questions that work

I've made these calls from both sides of the desk. These get the clearest answers:

"What's the CPT code on my order?" For a knee MRI without contrast, it should be 73721. If the order says something different (with contrast, for example), the prices change.
"Is this billed as a hospital outpatient department or an independent facility?" This tells you whether a facility fee may apply. Knee MRIs are especially prone to this when a hospital has acquired a practice, which we cover in Knee MRI Price Comparison: $425 at an Independent Center vs $1,850 After a Hospital Acquisition.
"Is the radiologist's read billed separately?" Under the fee schedule's professional component, it often is. Ask what that separate bill will add.
"How much of my deductible have I met?" Your insurer's member portal or a call to the number on your card will tell you. This determines which column of the table above you're in.
"Can I get the negotiated rate for this code at this facility in writing?" Most insurers are required to offer a price comparison tool, and hospitals must publish their prices. Both can be hard to read, so a written estimate is worth asking for. Our post on reading a hospital's CMS-required price file shows how to find the right line.

Also confirm that both the facility and the reading radiologist are in your network. The No Surprises Act protects you in many emergency situations, but for a scheduled outpatient scan, the network question is still yours to check.

Where these numbers come from, and where they stop

To be transparent about my sourcing: the row counts and dataset descriptions above come from Privenox's data layer. Physician Fee Schedule structure comes from the CMS files. The dollar amounts in the two tables are an illustrative scenario built to show how the math works. They are not quotes from a specific facility or plan. Your allowed amounts, coinsurance and remaining deductible will differ, and so will your answer.

That's the point. Neither a general article nor an AI summary can tell you which row you should pick. It takes your plan, your deductible status, your ZIP code and your procedure code.

Run the math with your own numbers

If a knee MRI, colonoscopy or any other scheduled procedure is coming up, take ten minutes before you book. Get the CPT code, find out how much deductible you have left, and compare the facilities within reach.

You can compare procedure prices and model your out-of-pocket cost for your own situation at Privenox. The goal isn't to pick a fight with anyone's hospital. It's for the price to be on the table before you say yes, not after the bill arrives.

Data behind this post

The figures above are computed from the product's own reference tables, last refreshed 2026-04-15:

3,060 rows from aca-marketplace-premiums
1,080 rows from bls-medical-cpi
6,286 rows from census-acs-health-context
5,700 rows from cms-fee-schedule
31 rows from healthcare-defaults
200 rows from kff-insurance-benchmarks

Sources

Sticker Shock at the Doctor’s Office Could Motivate Midterm Voters — KFF Health News
Mayo Clinic, Thermo Fisher partner to create biomedical database — Healthcare Dive
It’s Hard To Predict Who Will Be Suicidal. It’s Easier To Ensure People Can’t Shoot Themselves. — KFF Health News
How I Turned $99 Into a $6,205.32 Luxury Resort Stay — NerdWallet Health Insurance
Guide to Usage-Based Car Insurance — NerdWallet Health Insurance