Diagnostic Imaging Denied by Insurance
Legally reviewed By Scott Glovsky in Insurance and Healthcare Denials
When your doctor orders imaging, it is usually because something needs to be answered, clarified, or ruled out. If you are dealing with diagnostic imaging denied by insurance, it can leave you in a difficult position: waiting for answers while the insurance company questions whether those answers are necessary.
Imaging tests such as MRIs, CT scans, and PET scans are often used to detect serious conditions, monitor disease progression, and guide treatment decisions. When access to that testing is delayed, it can create uncertainty at a time when timing matters.
If your insurer has denied imaging that your doctor recommended, understanding what may be behind that decision is the first step toward moving forward. Contact us by calling us today 626-243-5598.
Key Takeaways: Diagnostic Imaging Denied by Insurance (California)
- A denied MRI, CT, or PET scan is not the final word: most diagnostic imaging denials in California can be challenged through an internal appeal and, when appropriate, an Independent Medical Review.
- Start with the denial letter and the deadline: insurers often deny imaging as “not medically necessary,” “experimental or investigational,” out-of-network, or due to prior authorization issues — your appeal should directly answer the stated reason.
- Medical documentation drives diagnostic imaging appeals: a detailed physician letter explaining symptoms, prior testing, suspected diagnosis, and the medical risks of delay is the single most important piece of an MRI, CT, or PET scan appeal.
- Ask for an expedited appeal when timing matters: delays in imaging for suspected cancer, neurological, cardiac, or other serious conditions can affect outcomes — urgent review can move the process much faster than a standard appeal.
- If denials continue, you have options: a California health insurance denial lawyer can review repeated denials, evaluate ERISA vs. non-ERISA plan rules, and advise before you submit an Independent Medical Review.
Why Are Diagnostic Imaging Requests Sometimes Denied?
Insurance companies rely on internal criteria when reviewing imaging requests. These criteria are based on internal medical policy guidelines and prior testing requirements.
A denial may be tied to:
- Questions about whether the imaging is medically necessary,
- Requirements to try other diagnostic methods first,
- Missing or incomplete documentation, and
- Prior authorization issues.
In some cases, the decision may not fully reflect the specifics of your symptoms or medical history. Imaging is often ordered when earlier evaluations are unclear, but insurers may still require additional justification before approving more advanced testing.
What Types of Imaging Are More Likely to Be Denied?
As imaging becomes more advanced (and usually more expensive), insurance companies may take a closer look at whether the test meets their criteria.
MRI Scans
Magnetic resonance imaging (MRI) is commonly used to evaluate soft tissues, the brain, spine, and internal organs. It can provide detailed images that other tests may not capture.
If your insurance denied an MRI or CT scan, it may be because the insurer believes that a less complex test should be used first or that the imaging is not yet necessary based on the information provided.
CT Scans
Computed tomography (CT) scans are often used to detect internal injuries, tumors, or abnormalities. They are frequently ordered when quick, detailed imaging is needed. Denials may occur when insurers believe the test is being ordered too early in the diagnostic process or without sufficient supporting documentation.
PET Scans
Positron emission tomography (PET) scans are typically used in more complex cases, including cancer diagnosis and monitoring. These scans can provide insight into how tissues and organs are functioning. Because of their cost and specialized use, a PET scan may be denied by insurance when the insurer questions whether the test meets their criteria or whether other imaging should be used first.
What to Do If Your Diagnostic Imaging Is Denied?
If your imaging request is denied, the next steps you take can influence how quickly you can move forward.
Begin by carefully reviewing the denial notice. It should explain why the insurer denied the request and outline any available next steps. Even if the explanation feels incomplete, it can point to what the insurer believes is missing. Of course you can reach out to your insurer and ask for more specifics on the reason for their denial as well as what their criteria for coverage of this test is. Sometimes they want to send this directly to the requesting provider.
You should also reach out to your doctor’s office. Your physician may be able to provide additional context, clarify the medical need, and submit further documentation that supports the request.
If you have timing concerns, especially if symptoms are worsening or unresolved, ask whether the situation qualifies for expedited review. In some cases, delays in imaging can affect how quickly a condition is identified or treated.
Keep a record of all communications with your insurance company and your medical providers. Having a clear timeline of what has happened can be helpful if the issue continues.
How to Appeal a Diagnostic Imaging Denial
Challenging a denial is often part of the process when imaging has been questioned.
To move forward with an appeal for a diagnostic imaging denial, you will typically need to submit an appeal directly to your insurance company. That allows you to provide additional information and address the reasons for the denial.
A strong appeal may include:
- A clear explanation of why the imaging is needed,
- Supporting notes from your treating physician,
- Relevant medical records, and
- Information about how the imaging will affect your care.
In California, some patients may also be eligible for an independent review process in which a third party evaluates whether the denial was appropriate. This can be an important option when internal appeals do not resolve the issue, and is required when your specific health plan is governed by ERISA.
When a Denial May Require a Closer Look
While insurance companies have the right to review claims, there are situations where a denial may not fully align with the medical circumstances.
For example, questions may arise when imaging is recommended based on ongoing symptoms, but the decision does not appear to account for those symptoms or the treating physician’s clinical judgment. In other situations, repeated requests for the same information or continued delays may create additional concerns.
Each case is different, and the details matter. Looking more closely at how the decision was made can help determine whether additional steps may be appropriate.
When to Speak with a Lawyer
There are times when it may make sense to bring in outside guidance, particularly if the denial is preventing you from getting answers about your condition.
You may consider speaking with a lawyer if you are facing:
- Delays in diagnostic testing that are affecting your care,
- Repeated denials despite updated medical support,
- Uncertainty about how your insurance plan applies, or
- Unexpected financial responsibility tied to the denied imaging.
A lawyer can review your situation and help you better understand what may be influencing the denial, what options remain available, and whether further action is worth considering. Even if you don’t ultimately pursue legal action, having a clearer picture of your position can help you decide how to move forward.
We recommend you contact an attorney prior to submitting an external appeal (AKA Independent Medical Review) if you have a health plan that is non-ERISA. These health plans are often from public entities or people who purchase their insurance directly. The reason is that it can be very difficult to overturn an IMR decision.
Getting Answers Should Not Be This Difficult
When imaging is recommended, it is usually because your doctor needs more information to understand what is happening in your body. Being denied that testing can leave you waiting for answers at a time when clarity is important.
If you are dealing with diagnostic imaging denied by insurance in California, it is important to remember that a denial does not end the process. There are additional steps you can take to challenge the decision and move forward with the testing your doctor believes is necessary.
At the Law Offices of Scott Glovsky, we help individuals stand up to insurance companies when coverage decisions do not reflect their medical needs. For nearly the past three decades, we have seen firsthand how patients can suffer when access to care or diagnostic testing has been improperly delayed or denied.
If your insurance company has denied imaging or is making it difficult to move forward, you can contact our office by calling us at 626-243-5598 to discuss your situation and learn more about your options.
💡 FAQ: Diagnostic Imaging Denied by Insurance in California (MRI, CT & PET Scan Denials)
Why was my MRI, CT scan, or PET scan denied by my insurance company in California?
Insurance companies most often deny diagnostic imaging by claiming the test is “not medically necessary,” that prior authorization was missing, that step therapy or another diagnostic step should have been tried first, that the imaging is “experimental or investigational,” or that the imaging facility is out-of-network. Your denial letter should state the specific reason — that reason is the foundation of your appeal for an MRI, CT scan, or PET scan denial in California.
How do I prove my MRI, CT, or PET scan is medically necessary?
Medical necessity for diagnostic imaging is usually supported by a detailed letter from your treating physician that explains your symptoms, exam findings, suspected diagnosis, what earlier testing has ruled out, and why imaging is needed now. Strong appeals also include clinical notes, prior test results, documentation of failed conservative treatment, and a clear explanation of the medical risks of delaying diagnosis or treatment.
What should I do first after my diagnostic imaging is denied by insurance?
Read the denial letter carefully, identify the exact reason for denial, and write down every appeal deadline. Save your Explanation of Benefits (EOB), prior authorization records, and all communications with the insurer and your providers. Then contact your doctor’s office — your physician may be able to clarify the medical need, correct documentation, and resubmit the request, which often resolves an MRI or CT scan denial before a formal appeal is even necessary.
Can I request an expedited appeal if I need an MRI or CT scan urgently?
Yes. If waiting could seriously jeopardize your health — for example, if your doctor suspects cancer, a neurological issue, or another condition where timing matters — you can request an expedited or urgent appeal. Ask your treating physician to put the urgency in writing and to specifically explain the risks of delaying the MRI, CT scan, or PET scan. Expedited reviews are designed to move much faster than standard appeals.
What is an Independent Medical Review (IMR) in California and when should I use it?
An Independent Medical Review is a process in California where a neutral, outside medical expert reviews whether your insurer’s denial was appropriate. IMR is typically available after an internal appeal is denied, and it can be especially powerful when the denial is based on medical necessity or an “experimental or investigational” label. Because IMR decisions are difficult to overturn, it is often wise to speak with a California insurance denial attorney before submitting your external appeal.
What is the difference between an ERISA and non-ERISA health plan when appealing an imaging denial?
If your health plan comes through a private employer, it is usually governed by ERISA, and external review is generally required as part of the appeals process. If your plan is non-ERISA — for example, a plan from a public entity or a policy you purchased directly — your options and protections under California law may look different. The type of plan affects deadlines, the evidence you can submit, and how a denied MRI, CT, or PET scan claim is reviewed, which is why it matters from the very first step.
What if my PET scan was denied as “experimental” or “investigational”?
PET scans are often used in complex situations, including cancer diagnosis and monitoring, and insurance companies sometimes deny them by labeling the imaging “experimental” or “investigational.” A strong appeal usually includes peer-reviewed clinical support, your physician’s explanation of why the PET scan is the appropriate test for your condition, and documentation of how the imaging will directly affect treatment decisions. These denials are also frequently good candidates for Independent Medical Review in California.
What if my insurance company keeps denying my MRI or CT scan even after I appeal?
Repeated denials despite updated medical documentation can be a sign that something more is going on — for example, the insurer may be ignoring your treating physician’s clinical judgment, applying internal criteria too rigidly, or relying on incomplete information. At that point you may have options beyond the internal appeal process, including external review and, in some California cases, evaluating whether the insurer’s conduct rises to the level of wrongful denial or health insurance bad faith.
How can a delay in diagnostic imaging affect my diagnosis or treatment in California?
Diagnostic imaging is usually ordered when your doctor needs more information to identify a condition, monitor disease progression, or guide treatment. When an MRI, CT scan, or PET scan is denied or delayed, it can push back a diagnosis, slow the start of treatment, and create real consequences for serious conditions such as cancer, neurological disorders, or internal injuries. If you have new or worsening symptoms, that delay-of-care risk should be clearly documented in your appeal.
When should I contact a California insurance denial lawyer about a diagnostic imaging denial?
Consider speaking with a California health insurance denial attorney if your denied MRI, CT scan, or PET scan involves urgent symptoms, a suspected serious condition, repeated denials, confusing insurer explanations, tight appeal deadlines, or unexpected financial responsibility. It is also wise to consult an attorney before submitting an Independent Medical Review on a non-ERISA plan, because IMR decisions can be very difficult to overturn. A lawyer can help build a stronger record, protect deadlines, and evaluate whether the insurer’s conduct supports further action.
Legal and Medical References Used to Inform This Page
To ensure the accuracy and clarity of this page, we referenced official legal resources during the content development process: