MRI vs CT Scan: Which Costs More, and Why

September 1, 2026  |  8 min read  |  LegitMedBilling Team

If you have been told you need a scan and you are trying to work out what it will cost, the short answer is that an MRI costs more than a CT — usually substantially. But the more useful answer is that the difference between the two scans is rarely a price decision, and treating it as one is how people end up paying for both.

Why the MRI Costs More

Three things drive the gap, and none of them are negotiable at the front desk.

The machine. An MRI scanner is far more expensive to buy, install and maintain than a CT scanner. It needs magnetic shielding, a dedicated room, and liquid helium to keep the magnet cold. That capital cost is recovered through the price of every scan.

The time. A CT of a single body part typically takes five to ten minutes. An MRI of the same area takes thirty to sixty. You are paying for scanner time, and an MRI occupies roughly six times as much of it.

The reading. Both scans generate a professional fee for the radiologist who interprets them, and MRI studies generally produce more images and take longer to read.

For actual price ranges, see our detailed breakdowns of MRI cost without insurance and CT scan cost without insurance. Both vary enormously by region and by facility — a hospital outpatient department and a freestanding imaging centre can quote very different numbers for the identical scan.

They Are Not Interchangeable

This is the part worth understanding before you start comparing prices, because the two scans see different things.

That speed difference is why emergency departments run CT rather than MRI. If someone arrives after a head injury, a CT answers the urgent question — is there bleeding — in minutes. An MRI would show more detail and take an hour the patient may not have.

Conversely, if the question is a torn meniscus or a herniated disc, a CT will show the bone beautifully and tell you very little about the soft tissue you actually care about. Choosing it to save money produces a scan that cannot answer the question, and you pay for the MRI afterwards anyway.

One Practical Difference: Prior Authorization

Because MRI costs more, insurers scrutinise it more. Most commercial plans route MRI through prior authorization — often via a radiology benefit manager — more consistently than they do CT.

This matters to you directly. A scan performed without required prior authorization is routinely denied, and depending on your plan and the facility’s contract, that denial can leave the entire amount with you. Before an MRI, confirm two things with the imaging centre: that authorization has been obtained, and that they have it in writing. Do not assume the ordering office handled it, and do not assume a scheduled appointment means it was approved.

What You Will Actually Pay

With insurance, the scan you had matters far less than where you are in your deductible year. On an unmet deductible you pay the full negotiated rate for either scan. With the deductible met and 20 percent coinsurance, you pay a fifth of it. The same MRI can cost you 1,400 dollars in January and 280 in November.

Our guide to what scans cost with insurance works through this with examples, and the patient responsibility calculator will do the arithmetic for your own deductible and coinsurance.

Two other things reliably move the number. A freestanding imaging centre is usually cheaper than a hospital outpatient department for the identical scan, because hospitals add a facility fee. And every scan generates two charges — a technical fee for the equipment and a professional fee for the radiologist — often billed separately, so two bills for one scan is normal rather than an error.

How to Ask the Right Question

Rather than asking your doctor for the cheaper scan, ask: “What would each one show for my situation?” If both genuinely answer the clinical question, the cheaper one is entirely reasonable and most doctors will say so. If they do not, you have learned why — and you have avoided paying twice.

Then, once the scan is decided, get the CPT code from the ordering office and quote it to both your insurer and the facility. Prices attach to codes, not to descriptions. If the final bill arrives higher than quoted, our guides on disputing a medical bill and negotiating a hospital bill cover what to do, and many patients qualify for hospital charity care without realising it.

Frequently Asked Questions