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What Is Utilization Review (UR) in California Workers' Compensation?
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By Eman Yazdchi, Esq. · Certified Specialist in Workers' Compensation Law, State Bar of California Board of Legal Specialization · Cal Bar #285231
What is utilization review in California workers' comp?
Utilization review is the insurer's process to approve, change, or deny the treatment your doctor requests, judged against California's official medical guidelines.
Your doctor said you need surgery. Or therapy. Or an MRI. Then a letter arrives. It says no.
That denial came from utilization review. It can feel like a stranger just overruled your own doctor. We understand how upsetting that is. You are hurt, and now the care feels out of reach.
Take a breath. A denial is not the final word. The law gives you a clear way to fight back. This page explains how the process works, how fast it must move, and how to appeal a no.
You do not have to figure this out alone. We have helped many injured workers turn a denial into approved care. Many denials get overturned once a worker pushes back the right way.
How does utilization review work?
Your doctor sends a treatment request. A reviewer checks it against state medical guidelines, then approves, changes, or denies the care.
It starts with your treating doctor. They fill out a form called a Request for Authorization, or RFA. This form lists the exact care you need. It might be surgery, an MRI, physical therapy, or medication.
The insurer sends that request to utilization review. Labor Code 4610 sets up this process. A trained reviewer reads the request. For any denial, that reviewer must be a licensed doctor. A claims adjuster cannot deny your care on medical grounds.
The reviewer compares your request to the state's medical rulebook. This rulebook is called the MTUS. It lists the treatments proven to work for each kind of injury.
The reviewer has three choices. They can approve your care. They can modify it. That means they say yes to only part of it. Or they can deny it fully.
Why does the insurer get to do this at all? The law lets them check that care is safe and needed. The goal is to stop treatment that does not help. But good care sometimes gets caught in the net too.
Your care is meant to be fully covered with no copay under Labor Code 4600. Utilization review is the gate every treatment must pass through first.
How long does utilization review take?
Most decisions are due within five business days. Urgent requests get an answer in 72 hours. Care already given is reviewed within 30 days.
The clock depends on how urgent your care is. Your doctor's request, the RFA, starts that clock. The table below shows the main deadlines under Labor Code 4610.
| Type of review | When it applies | Decision deadline |
|---|---|---|
| Standard | Care you have not received yet | 5 business days |
| Expedited | Urgent risk to your health | 72 hours |
| Retrospective | Care you already received | 30 days |
| Extension | Reviewer needs more records | Up to 14 days |
If the reviewer needs more records, they can take a short extension. But they must tell you they are waiting. They cannot just sit on your request in silence.
For urgent care, the rules move faster. If waiting could seriously harm your health, you get the 72-hour track. Ask your doctor to mark the request as urgent when it truly is.
What should you do while you wait? Keep going to your approved appointments. Follow your doctor's advice. Write down how you feel each day. That record can support your next request.
A late decision matters more than you might think. If utilization review misses its deadline, the denial can fall apart. Then a workers' comp judge may be able to decide your care instead.
Save every letter. Write down the date each one arrived. Those dates can prove a deadline was missed.
What if utilization review denies your treatment?
You can appeal a denial through Independent Medical Review. A new state-chosen doctor looks at your case. The appeal is free to you.
A denial is not the end of your claim. Labor Code 4610.5 gives you the right to appeal. This appeal is called Independent Medical Review, or IMR.
You must act fast. The deadline is 30 days from the date on the denial letter. The form you need comes with that letter. Sign it and send it back.
| Your appeal right | The detail |
|---|---|
| How you appeal | Independent Medical Review (IMR) |
| Your deadline | 30 days from the denial |
| What it costs you | $0 |
| Who decides | An independent outside doctor |
An outside doctor reviews your records. They do not work for the insurer. They check whether your care fits the medical guidelines. Their decision can overturn the denial.
While you appeal, your other approved care keeps going. The denial only covers the one request. Do not skip appointments that are already approved.
What if the appeal doctor also says no? You may still have options. A lawyer can check whether each step was done right. A mistake in the process can reopen your fight.
Read your denial letter the day it arrives. The 30-day clock is short and strict. Miss it, and you can lose the chance to appeal. Call a lawyer right away if the letter confuses you.
How can you help your doctor win utilization review?
Help your doctor prove the care is needed. Report every symptom. Make sure the request points straight to the medical guidelines.
You and your doctor are a team. The reviewer wants proof the care is medically needed. Your job is to give your doctor the facts that show it.
Tell your doctor everything. List every symptom. Explain how the injury limits your day, your sleep, and your work. Small details can be the reason a request gets approved.
Ask your doctor to tie the request to the MTUS guidelines. A request that matches the rulebook is much harder to deny. A vague request is easy to turn down.
Respond fast if the reviewer asks for more records. A missing test result can sink a strong request. Keep copies of every report and every letter you get.
Stay inside your medical network when you can. The MPN usually sets the doctors who can treat you under Labor Code 4616. A network doctor knows how to write these requests the right way.
If denials keep coming, get help. A workers' comp lawyer can push back on a bad UR decision. You do not pay a fee up front.
Injured at work? Call (661) 273-1780
Tap to call →If you are an injured worker in Greater Los Angeles, a treatment denial can stall your recovery and your life. Bills pile up. Pain drags on. You deserve the care your doctor ordered. Yazdchi Law fights these denials every day. We represent injured workers across the Antelope Valley, the San Fernando Valley, and Greater Los Angeles.
We know the local system from the inside. We appear at the WCAB offices in Van Nuys, Los Angeles, Long Beach, Pomona, San Bernardino, Riverside, and Oxnard. That means we know how the judges and claims teams in your area handle treatment fights. We use that knowledge to push your care through.
Eman Yazdchi is a Certified Specialist in workers' compensation law, certified by the California Board of Legal Specialization, State Bar of California. When utilization review denies your care, you want someone who handles these appeals all the time, not once in a while.
Do not face a denial alone. The consultation is free, and you pay no fee up front. We answer the phone, and we explain your options in plain English. Call (661) 273-1780 and we will review your denial today.
Frequently Asked Questions
What does utilization review mean in workers' comp?
Utilization review is how the insurer decides whether to pay for the treatment your doctor asks for. A reviewer, usually a licensed doctor, checks the request against California's medical guidelines, called the MTUS. They can approve it, change it, or deny it. This process is set by Labor Code 4610. It applies to nearly every treatment request in your claim, from an MRI to surgery. A claims adjuster cannot deny your care on medical grounds. Only a reviewing doctor can do that.
How long does utilization review take in California?
It depends on how urgent your care is. A standard request gets a decision within five business days. If your health faces an urgent risk, the answer is due within 72 hours. Care you already received is reviewed within 30 days. The reviewer can take up to 14 days if they truly need more records. But they must tell you they are waiting. They cannot leave your request open with no word. Save the dates, since a missed deadline can help you.
Can I appeal if utilization review denies my treatment?
Yes. A denial is not the final word. You appeal through Independent Medical Review, or IMR, under Labor Code 4610.5. You must file within 30 days of the denial letter. The appeal costs you nothing. An outside doctor who does not work for the insurer reviews your records. That doctor decides whether you really need the care. The form to start the appeal comes attached to your denial letter. Sign it and return it before the deadline passes.
What is the MTUS in workers' comp?
The MTUS stands for the Medical Treatment Utilization Schedule. It is California's official rulebook for work-injury care. It lists the treatments proven to work for each kind of injury. Utilization review uses the MTUS to judge your doctor's request. When your doctor ties the request to the MTUS, it is much harder for a reviewer to deny. The guidelines are not the final word in every case. Your doctor can explain why your injury needs something different. Strong medical records make that case much easier to win.
What happens if utilization review misses its deadline?
The reviewer must decide on time. A standard request is due within five business days. If utilization review blows that deadline, the denial can be invalid. In that case, a workers' comp judge may be able to decide whether you need the care. That can be better for you than the normal appeal. This is one big reason to save every letter and write down the date it arrived. A lawyer can spot a missed deadline fast. Acting quickly protects your right to the care you need.
How can I help my doctor get my treatment approved?
Be honest and thorough at every visit. Tell your doctor about every symptom and how the injury limits you. Ask your doctor to connect the request to the MTUS guidelines. Keep copies of every report and every denial letter. Respond fast if the reviewer asks for more records. The stronger and clearer the request, the harder it is to deny. If your care keeps getting denied, talk to a workers' comp lawyer. You pay no fee up front.
Last reviewed by Eman Yazdchi, Esq., June 2026.
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