The denial letter arrives, and most injured workers assume it’s over. The MRI, the injections, the surgery their doctor recommended is now off the table. That fear is understandable, but it’s wrong. A utilization review denial isn’t a final answer. It’s a checkpoint in a process that has a real, statutory appeal path, and the deadline clock starts the moment that letter hits your mailbox.
We’ve been representing injured Sacramento workers for more than 50 years, including a long history with union members who know exactly how much a treatment denial can upend a recovery. What we see most often is that workers either wait too long to respond or file through the wrong channel entirely. Both mistakes are avoidable if you understand what a utilization review decision actually is and what comes next.
What a Utilization Review Denial Actually Means
Utilization Review, commonly called UR, is the process by which a claims administrator decides whether to approve, modify, or deny a treating physician’s Request for Authorization (RFA) for medical treatment. Under Labor Code section 4610, the claims administrator must issue a standard UR decision within five business days of receiving the RFA, or within 72 hours for urgent care requests. If the claims administrator misses that statutory deadline, the UR decision is invalid. The treatment dispute bypasses the normal IMR process and must instead be resolved before a workers’ compensation judge. Before assuming you need to file an appeal, check the dates on the RFA and the denial letter.
A UR decision only addresses medical necessity. It determines whether the requested treatment meets the standards in the Medical Treatment Utilization Schedule (MTUS), the evidence-based treatment framework California uses for workers’ comp cases. It doesn’t decide whether your underlying injury is covered or whether the body part at issue is compensable. If your employer is disputing whether the injury happened or whether a particular body part is work-related, that’s a separate dispute handled by a workers’ compensation judge at the Workers’ Compensation Appeals Board (WCAB), not through IMR. Filing in the wrong forum wastes time you can’t afford to lose.
The 30-Day Window to Request an Independent Medical Review
Assuming the UR denial was timely and addresses medical necessity, you have 30 days from the date the denial notice was served to file an application for Independent Medical Review (IMR) under Labor Code section 4610.5. The claims administrator is required by law to include DWC form IMR-1 with the denial letter. That completed form, along with supporting documentation, gets submitted to Maximus Federal Services, the private organization contracted by the Division of Workers’ Compensation (DWC) to conduct IMR in California. Missing the 30-day window typically forfeits your right to appeal that specific denial. However, if your treating physician submits a new RFA with updated medical evidence showing your condition has changed or progressed, that triggers a fresh UR decision and a new 30-day IMR window.
What Determines Whether IMR Overturns the Denial
Independent Medical Review is a paper-only process. The IMR physician assigned by Maximus Federal Services never examines you. They review the RFA, the denial letter, your medical records, and any additional documentation submitted with the application. The outcome depends entirely on the quality and completeness of what’s in the file.
That context matters when you look at the numbers. According to the DWC’s most recent Independent Medical Review Annual Report, 10.2 percent of UR treatment denials were overturned at the IMR stage statewide, down from 12.7 percent the year before. The odds aren’t favorable, but the cases that do succeed tend to share something in common: the record is built carefully before the application is filed.
These are the materials that can be submitted with an IMR application to strengthen the record:
- A letter from your treating physician explaining the specific clinical rationale for the requested treatment and how it meets MTUS guidelines
- Peer-reviewed medical literature supporting the treatment approach, particularly for conditions or procedures the MTUS addresses only broadly
- Prior treatment records documenting the progression of the condition and what conservative measures have already been tried and failed
If IMR Upholds the Denial: What Options Remain
An IMR determination that upholds a denial isn’t freely appealable. Under California Labor Code section 4610.6, you can only challenge it before the WCAB on narrow grounds: that the administrative director acted without or in excess of their powers, fraud, conflict of interest, bias, or a plainly erroneous express or implied finding of fact. You can’t appeal simply because you disagree with the outcome. If you believe those narrow grounds apply, a petition must be filed within 30 days of the date the determination was mailed, and Sacramento-area workers have their petitions heard at the Sacramento district office of the WCAB.
It’s also worth remembering that an upheld IMR denial doesn’t end the workers’ comp case. Disputes about permanent disability, return to work, vocational rehabilitation, or the compensability of other body parts continue on their own track.
The Denial Letter Is a Timer, Not a Closed Door
The pattern we see repeat itself is workers who wait, assuming the denial means there’s nothing left to do. But every step in this process (the IMR application, the WCAB petition, even a new RFA with updated records) runs on a deadline. Treating the letter as the timer it is makes the difference between preserving your options and losing them.
Having our attorneys review the file before anything is filed can matter: checking whether the UR decision was timely, confirming the right forum, and making sure the IMR record is as complete as the evidence allows. Smolich and Smolich has been doing exactly that for injured workers and union members in Sacramento for more than 50 years. If a UR denial just arrived, call us at (916) 571-0400 before that 30-day window closes.