How Do Independent Medical Reviews Factor in a California Workers’ Comp Case?

 Posted on July 02, 2026 in Workers' Compensation

An Independent Medical Review, or IMR, can play a major role in a California workers' compensation case. It is a process used to resolve disputes between injured workers and insurance companies over medical treatment decisions. If your treating doctor recommended a treatment and the insurance company denied it, an IMR is one of the main ways that dispute gets settled. If you are dealing with a denied treatment in 2026, our Santa Clara County workers' comp lawyer can help you navigate the process and fight for the care you need.

How Does an Independent Medical Review in a California Workers' Comp Case Work?

In California, the IMR process is governed by California Labor Code Section 4610.5. The process starts when your treating doctor requests a treatment through something called Utilization Review, or UR. The request goes to a qualified medical reviewer who decides whether the treatment should be approved, changed, delayed, or denied.

If the treatment is denied, modified, or delayed through a valid UR decision, you can generally request an IMR to challenge that decision. If the UR process was not completed properly or within the required deadlines, other legal remedies may be available instead of IMR.

The IMR is handled by a state-approved organization that has no connection to the insurance company or to you. Their decision is based entirely on whether the requested treatment is medically necessary according to established medical guidelines.

What Types of Workers’ Comp Treatment Disputes Go Through the IMR Process?

The IMR process applies to disputes over medical treatment. Common examples include:

• Surgery requests that the insurance company has denied
• Prescription medications that have been refused or limited
• Physical therapy or rehabilitation that has been cut short
• Specialist referrals the insurance company will not approve
• Diagnostic tests like MRIs or CT scans that have been denied
• Pain management treatments like injections that have been refused

If your doctor believes a treatment is necessary and the insurance company disagrees, the IMR process is how that dispute gets resolved.

How Do You Request an Independent Medical Review in California?

When a treatment is denied through Utilization Review, you will get a written notice explaining the denial and your right to request an IMR. You generally have 30 days after you are served with the written UR decision and IMR application to submit your IMR request.

The Department of Industrial Relations then assigns the case to an independent medical organization. That organization reviews your medical records, your doctor's treatment request, and the UR denial. They then decide whether the treatment meets the criteria for medical necessity based on accepted clinical guidelines.

Do not miss the 30-day deadline. Missing it can limit your ability to challenge the denial, which may leave you with fewer options for getting the treatment approved.

What Happens After an IMR Decision Is Made in a Workers’ Comp Case?

The IMR decision is binding. That means both the insurance company and you are bound by the outcome. If the IMR upholds the denial, the treatment will not be covered. If the IMR overturns the denial, the insurance company must approve and pay for the treatment.

It is very hard to challenge an IMR decision after it has been issued. An IMR decision can be challenged only on very limited statutory grounds, including fraud, conflict of interest, material bias, plainly erroneous findings of fact, or other specific circumstances identified in California Labor Code section 4610.6.

How Can an Attorney Help With the IMR Process?

Having an attorney involved before and during the IMR process can make a big difference. Your attorney can make sure all relevant medical records are submitted completely and on time. They can also make sure your doctor's request is as well-supported as possible. And they can verify that all procedural requirements are met along the way.

Your attorney can also help you figure out whether the IMR process is the right path in your situation. If not, there may be other options worth pursuing. And if an IMR decision goes against you, your attorney can evaluate whether any of the limited grounds for appeal apply to your case.

Schedule a Free Consultation With Our Gilroy, CA Workers’ Compensation Attorney

Dealing with a denied treatment while you are trying to recover from a work injury is beyond frustrating. You need a legal representative who understands the system and will fight to get you the medical care you need. Our Santa Clara County workers' comp lawyer brings over 15 years of legal experience to every case. He is ready to help you through the IMR process and every other part of your workers' compensation claim.

Contact Raul Martinez Injury Law Firm at 408-848-1113 today to schedule your free consultation.