MRI Prior Authorization and Denials: Timelines and Appeals

Many people meet prior authorization for the first time when a scan they were told they needed is refused. This guide explains when MRIs and CT scans need approval, why insurers say no, how long approval should take, how to appeal, and how a scan you pay for yourself, at home or abroad, fits with your insurance. For cash prices at home, see our guide to MRI costs without insurance.

Do MRIs and CT scans need prior authorization, and who submits it?

Usually yes for planned MRI and CT scans, and the request normally comes from the office of the doctor who ordered the scan, not from you. Many plans treat MRI, CT and PET as advanced imaging that needs approval before a non-emergency scan; emergency scans are handled differently. Some imaging centres start the request themselves, but if they ask you to book first, call the ordering doctor's office and ask it to submit.

An approval is usually tied to a specific test, a body part and a period of time, and often to the facility in the request. If you move the appointment or change centres, check that the approval still applies. Prior authorization is a payment rule, not a medical one: you can still have the scan without it by paying the imaging centre directly, usually with a doctor's order.

Why would insurance deny an MRI?

The most common reasons are that the plan wants a cheaper step first, such as an X-ray or several weeks of physical therapy, or that the request did not show the plan's criteria were met. A wrong or vague diagnosis code, a missing clinic note or an out-of-network facility can also lead to a denial.

Ask the insurer for the medical policy that applies to the scan's procedure code. It lists what the plan wants to see, for example a number of weeks of treatment or particular findings on examination. If you have already done physical therapy, make sure those records reached the plan.

How long does insurance take to approve an MRI?

For plans covered by the federal claims and appeal rules, HealthCare.gov says insurers must decide a prior authorization request within 15 days, or within 72 hours for urgent care, as of October 2026. For Medicare Advantage, Medicaid and CHIP plans, a CMS rule in force from 1 January 2026 sets 7 calendar days for standard requests and 72 hours for expedited ones, and requires a specific reason for any denial.

The longer delay is often the step before the request: a plan that wants six weeks of physical therapy first will not approve the scan until that is done and documented. Ask your doctor at the first visit whether the plan has such a step, so the clock starts early.

How do you appeal an insurance denial for an MRI?

Start by asking your doctor's office to fix any administrative problem and resubmit, or to request a peer-to-peer review with the insurer's doctor. If that fails, file an internal appeal, and after a final denial ask for an external review by an independent reviewer.

HealthCare.gov gives the federal timeline as of October 2026: 180 days from the denial notice to file an internal appeal; a decision within 30 days for a scan you have not had, or 60 days for one already done; then four months to request an external review, decided within 45 days or 72 hours when urgent. The insurer must accept the external reviewer's decision, and the review costs nothing or at most USD 25. Your state insurance department can help with fully insured plans. These are general mechanisms, not legal advice.

Do not let an appeal delay emergency care. Losing control of the bladder, numbness around the groin or sudden weakness in the legs needs an emergency department the same day, where scans are done on clinical grounds.

Will insurance cover treatment for something found on a scan you paid for yourself?

Usually the follow-up is judged on its own merits. If a self-paid scan shows a problem, your doctor orders the next tests or treatment and the plan applies its normal rules, often including its own prior authorization. The plan does not normally refund the scan you paid for, so ask before you pay whether it will accept a self-pay receipt toward your deductible.

Scans abroad follow the same logic, with one more step: your doctor at home has to be able to read them. Bring the images in DICOM format on a disc or USB, the written report, and an English version if the hospital offers one. Medicare says it usually does not cover care outside the US, and other plans vary, so ask your insurer in writing. Our guide to using a scan done abroad at home covers this in detail.

What does an MRI cost in China if you pay yourself?

At Chinese public hospitals, patients report a median of about CNY 484 (≈ USD 72) for a plain MRI of one area, about CNY 1,018 (≈ USD 150) with contrast and about CNY 210 (≈ USD 31) for a plain CT, before insurance (Chinese patient reports, 2025–26). That matches Xinhua's 2025 report that MRI cost about CNY 500 (≈ USD 75) after the national radiology price reform. Foreign patients at a standard department pay the same listed price as local patients without insurance; international departments charge more.

There is no official statistic for how quickly a scan can be booked in China, so the hospital should confirm the date before you book travel. A single scan is rarely worth a long flight alone, but it can make sense alongside a checkup or a consultation you were planning anyway.