Getting an MRI is hard because multiple barriers stack on top of each other: insurance companies require extensive pre-approval, facilities face staffing shortages and equipment constraints, wait times stretch weeks or months, and the scans themselves are expensive. For many people, the frustration isn’t one single obstacle but a chain of them, each adding delay.
Insurance Pre-Approval Is the Biggest Bottleneck
Most insurance plans require prior authorization before they’ll cover an MRI, meaning your doctor has to submit documentation proving the scan is medically necessary before you can even schedule it. This isn’t a rubber stamp. Insurers want specific evidence: relevant signs and symptoms, physical exam findings, lab results, prior failed treatments, and completed visit notes that are signed and finalized. Incomplete or preliminary notes get rejected.
The requirements vary by body part and get surprisingly granular. For a spine or joint MRI, most insurers require a period of conservative treatment first, typically at least four to six weeks of physical therapy within the past 12 weeks. A physical therapy discharge summary needs to show the right body region was treated, the effort was made in good faith, and it happened recently enough to count. Some insurers won’t accept physical therapy completed more than 12 weeks before the MRI request, even if it was for the same pain. For brain MRIs, headaches alone usually aren’t enough. You need documented evidence of increasing frequency or intensity, or neurological abnormalities found during an exam. If memory loss is the concern, your doctor has to show cognitive test scores and lab work ruling out reversible causes like thyroid problems or vitamin B12 deficiency.
A study published in the National Institutes of Health examined this process for shoulder pain specifically. Insurance payers routinely mandate six weeks of conservative treatment before authorizing an MRI, even when an orthopedic surgeon clinically suspects a rotator cuff tear on the first visit. The researchers questioned whether this delay was justified, since experienced surgeons were often right about the tear. But the insurance requirement stands regardless.
This back-and-forth between your doctor’s office and the insurer can take days to weeks. If the first submission is denied, an appeal adds more time. Your doctor’s staff may be handling dozens of these requests simultaneously, and a single missing document can restart the clock.
Staffing Shortages Limit Available Appointments
Even after approval, you may wait weeks for an open slot. MRI machines need specially trained technologists to operate them, and those positions are increasingly hard to fill. The American Society of Radiologic Technologists reported in 2025 that the vacancy rate for MRI technologists reached 17.4%, up from 16.2% the previous year and approaching record highs. That means roughly one in six MRI tech positions sits empty at any given time.
Fewer technologists means fewer hours the machines can run, which means fewer appointments. Facilities that have the equipment may not have the staff to use it at full capacity, creating a bottleneck that has nothing to do with insurance or medical necessity.
Wait Times Stretch Longer Than You’d Expect
For non-emergency scans, the wait can be substantial. Research comparing MRI scheduling across multiple countries found median wait times of one to two months in Israel, six to 18 weeks in the UK, and 12 to 20 weeks in Canada. The U.S. system varies widely depending on your location, insurance, and whether you’re willing to use an independent imaging center rather than a hospital. Rural areas with fewer machines naturally have longer waits. Urban centers may have more machines but also far more demand.
MRI Scans Are Expensive to Run
An MRI machine costs between $1 million and $3 million to purchase, and operating costs are steep. One major expense most people never think about: helium. Conventional MRI scanners cool their superconducting magnets to roughly negative 270 degrees Celsius by immersing them in about 2,000 liters of liquid helium. That helium needs regular replenishment, and global supply is unreliable. Since 2006, there have been four major helium shortages worldwide, with the most recent in 2022 putting radiologists on high alert. Helium is difficult to extract and purify, making it both expensive and scarce.
These operating costs get passed along. Hospital-based MRI scans tend to cost significantly more than scans at freestanding outpatient imaging centers, sometimes two to three times as much for the identical scan. If you’re paying out of pocket or facing a high deductible, the price alone can be a barrier.
Physical and Safety Limitations
Not everyone can physically undergo a standard MRI. The bore (the tube you lie inside) has size limits, and patients over 260 pounds may need to measure their body diameter to confirm they’ll fit. Weight limits at major medical centers like UCSF range from 450 to 550 pounds depending on the specific machine. Open MRI scanners exist for larger patients or those with severe claustrophobia, but they use weaker magnets and produce lower-quality images, which limits their diagnostic usefulness.
Claustrophobia itself is a real obstacle. As a patient’s body gets closer to the inner wall of the bore, the sense of confinement intensifies. Some people need sedation to complete the scan, which adds scheduling complexity, cost, and recovery time.
Metal Implants Can Disqualify You Entirely
Because MRI machines use powerful magnets, certain implants make the scan dangerous or impossible. Pacemakers, implantable defibrillators, cochlear implants, drug infusion pumps, metallic foreign bodies in the eyes, neurostimulation devices, cerebral aneurysm clips, and retained metallic fragments like shrapnel are all absolute contraindications. The magnetic field can heat, move, or malfunction these devices.
A longer list of implants falls into a gray area. Coronary stents, joint replacements, IUDs, surgical clips, wire sutures, and spinal rods may be safe depending on the specific make, model, and how long ago they were implanted. Each case requires verification, which takes time. Even medication patches need to be removed before scanning, and tattoos in the imaging area that are less than six weeks old require rescheduling. A recent colonoscopy within the past eight weeks requires confirmation that no retained clips or capsule devices are present.
All of this screening adds another layer of coordination before the scan can happen, and if your implant records are incomplete or unavailable, the scan may be postponed until they’re located.
What You Can Do to Speed Things Up
If your doctor has ordered an MRI and you want to minimize delays, a few practical steps help. Ask your doctor’s office to submit the prior authorization with complete, signed notes and all supporting documentation on the first attempt. If physical therapy is required, confirm with your insurer exactly how many weeks are needed and make sure the discharge summary includes the specific body region and dates. Ask whether an independent imaging center is an option, since these often have shorter wait times and lower costs than hospital-based facilities. If you have any implants, locate the manufacturer and model information before your screening appointment so the safety check doesn’t cause a separate delay.