Utilization Review in Workers’ Comp: What It Is and How to Fight a Denial

Utilization review (UR) is the process an employer or its claims administrator uses to decide whether the treatment your doctor wants is medically necessary. If the reviewer approves the request, care goes ahead. If the reviewer modifies or denies it, you can usually challenge the decision, but the rules, deadlines and appeal venue depend on your state. This guide explains how UR works, where it commonly goes wrong, and what to do the day a denial letter arrives.

TL;DR

• UR checks treatment requests against state medical guidelines. It is not a ruling on whether your injury is work-related, and it is not a ruling on your cash benefits.
• A denial is usually appealable, but the path differs by state. In California it is a state-run review process. In Texas it is an independent review organization (IRO) after an internal step, with exceptions for urgent cases.
• Many UR denials come from thin paperwork, not bad medicine. The quality of your doctor’s supporting documentation matters as much as the treatment itself.
• CMS guidelines do not govern ordinary UR. They apply to Medicare Set-Aside arrangements, which is a separate question.

Table of Contents

• What utilization review actually is
• The three types of utilization review
• How long a review can take
• Why treatment requests get denied
• What to do when UR denies your treatment
• UR and your settlement: the part nobody mentions
• UR is not the same as a CMS review
• Our perspective
• Check your numbers while you wait
• FAQ
• Sources

What utilization review actually is

When your treating doctor recommends surgery, an MRI, physical therapy or a prescription, the insurer does not simply pay. In many states the request goes through UR first. California’s Division of Workers’ Compensation describes UR as the process employers or claims administrators use to review treatment to determine if it is medically necessary, and says every employer or claims administrator must have a program. The DWC’s own FAQ for injured workers adds that UR confirms the treatment plan is medically sound.

Three points matter for you as a worker:

1. UR is about medical necessity. It is not about whether the injury happened at work. A claim denial is a different fight, and we cover it in our guide to what to do when a workers’ comp claim is denied.
2. It runs on guidelines. California, for example, reviews requests against its Medical Treatment Utilization Schedule (MTUS). Other states use their own guidelines or adopted national ones.
3. The reviewer is usually a paper reviewer. Decisions are generally based on the records submitted, so what is in the file is what gets judged.

The point of the system, as California’s DWC frames it, is to keep treatment based on objective, scientific guidelines. Workers often experience it as a tool to say no, and both views have some truth. A well-documented, guideline-consistent request tends to move through. A poorly documented one tends to stall.

The three types of utilization review

You will see three terms in letters and plans. They describe when the review happens:

These categories appear in state-approved plans, including a California UR program filed under the DWC’s rules. Each type follows its own timelines and notice requirements, so check which one your letter refers to.

Retrospective review is the one that hurts most. If treatment was given without approval, the bill can be denied and the provider may stop seeing you. Whenever you can, get approval first.

How long a review can take

Timelines are set by state law, and they are short on paper but flexible in practice.

California. The standard prospective review time is 5 business days. The DWC’s FAQ explains that administrators can extend that to 14 days if they need more information, or up to 30 days if they need an additional exam or test. The DWC’s FAQ for injured workers lays out these steps. A longer wait is not always a violation. It can be a procedural step the administrator is entitled to take.

Texas. For non-network claims, the TDI’s process sheet says the reviewer must approve or issue an adverse determination within three working days of receiving a preauthorization or concurrent review request. Other deadlines in that process vary by request type, so read the sheet for your situation.

If you live elsewhere, find your state workers’ compensation agency’s UR page and write down the deadline for your type of request. Then calendar it. A delay that you do not track is a delay you cannot challenge.

Why treatment requests get denied

According to the California DWC, a treatment that is standard practice is not automatically approved. UR checks medical necessity against a schedule, and a request lacking the documentation that substantiates necessity can be denied even when the treatment itself is reasonable.

Common causes we see described by workers and in agency materials:

• Missing clinical notes. The request says what the doctor wants, not why the guidelines support it.
• Treatment outside the guidelines with no explanation of why your case is different.
• Conservative care not documented. If therapy or medication was tried first, the records need to show it and what happened.
• Wrong form or wrong recipient. A request faxed to the wrong department can sit unanswered.
• Gaps between visits, which make ongoing need look uncertain.

Notice that most of these are fixable by your doctor’s office. Ask them directly: what records went with the request, and does the note explain why this treatment is necessary for your specific condition?

What to do when UR denies your treatment

Here is a practical order of operations. Details change by state, so confirm each step with your state agency.

1. Read the whole notice. It should state the decision, the reason, and how to appeal. Do not rely on a phone call summary.
2. Note every date. Write down the date on the letter, the date you received it, and the appeal deadline. Deadlines often run from the date on the notice, not the date you opened the envelope.
3. Call your doctor’s office the same day. Ask whether they can send more records, a letter of medical necessity, or a peer-to-peer call with the reviewer.
4. Find the right appeal route. Some states send you to an internal reconsideration first. Others go straight to an independent review.
5. File on time, in writing, and keep copies of everything, including fax confirmations.
6. Keep treating where you can. Do not skip care that is already authorized because a different request was denied.

Texas: reconsideration first, then an IRO

In Texas, medical necessity disputes go to an independent review organization. The TDI explains that if the carrier will not approve treatment, you or your healthcare provider can ask for a review of the denial, and an IRO reviews it. An IRO is certified by the Texas Department of Insurance.

The step many people miss is the order. Workers typically complete the internal reconsideration with the carrier first. The main exception, per the same TDI FAQ, is a life-threatening condition, where you can go directly to the IRO. Filing too early is a common and avoidable error.

The quality of the appeal matters too. Experts quoted around Texas appeals advise giving a substantive, reasoned explanation for why the denial should change, not simply stating that you disagree. Bring the medical facts, the guideline your doctor relies on, and what happens if treatment is delayed.

California: the DWC process

California’s UR is governed by Labor Code section 4610, and the DWC’s pages describe what the claims administrator must do and what rights you have after a modification or denial. Start at the DWC utilization review page, then use the FAQ for injured workers to find the next step. A denial in California is reviewed through a state process rather than the carrier deciding again, and the deadline to request it is short, so read your notice the day it arrives. If you want to see how benefits work in that state, our California workers’ comp calculator shows the 2026 maximum weekly rate.

Oregon: know which venue handles which issue

Oregon’s Department of Consumer and Business Services notes that workers often have several disputes running in different places at once, such as vocational assistance and medical necessity. As the DCBS dispute resources explain, the Workers’ Compensation Division often handles medical necessity, while the Workers’ Compensation Board may have original jurisdiction over claim denials or time-loss issues. Sending a dispute to the wrong place is a common cause of delay. Oregon readers can also check benefits with our Oregon calculator.

UR and your settlement: the part nobody mentions

UR does not end when your claim settles or closes. The California DWC notes that UR can still apply to future medical treatment awarded in a case unless a settlement specifically excluded it. That surprises many claimants after their case is “closed.”

This changes how you should look at a settlement offer:

• If future medical stays open, every later treatment request can face review again. Ask yourself how likely it is that you will need ongoing care, and how hard it will be to get approved.
• If you close out medical, you get a lump sum but take on the cost and risk of future care. That is a major tradeoff, and you should price it before you sign.
• Lifetime medical rules vary by state. See our guide to checking your state’s lifetime medical rules.

Our settlement calculator gives you a starting range for the indemnity part of a deal. It does not price future medical care, so treat any figure as one piece of the decision.

UR is not the same as a CMS review

People searching this topic often ask about CMS guidelines for utilization review. CMS does not issue guidelines for private workers’ comp UR. Its role shows up in Medicare Set-Aside arrangements. CMS reviews WCMSA proposals to protect Medicare’s interests, as laid out in its WCMSA Reference Guide, not to authorize routine clinical treatment.

CMS also publishes review thresholds. According to its workers’ comp set-aside page, a submission is generally recommended only if you are a Medicare beneficiary with a settlement above $25,000, or you reasonably expect Medicare enrollment within 30 months and the settlement is above $250,000. If that sounds like you, read our piece on negotiating an MSA before agreeing to terms.

Our perspective

We built this site around cash benefits: weekly rates, caps, impairment ratings and settlement ranges. But the workers who write to us most often are stuck on something else. They have a settlement number in mind, and their care is stalled in review.

We think that is backwards. Treatment decides how well you recover and how much you can work, which in turn drives everything else in your claim. A denied surgery can mean months of lost wages and a weaker case on permanent impairment.

So our advice is plain. Treat the paperwork around your treatment as seriously as the treatment. Ask your doctor what is in the request. Track every deadline. Do not assume that a late answer means you have won, or that a denial means you have lost. And before you accept any settlement, know what you are giving up on future care.

We are not a law firm and we cannot review your records. What we can do is give you a realistic picture of the numbers so you walk into any conversation prepared. If your denial involves surgery, a long-term plan, or a dispute that is already in a formal process, a workers’ compensation attorney in your state is the right person to talk to. Many offer free consultations.

— Daniel

Check your numbers while you wait

A slow review often means weeks without income, so it helps to know what you should be receiving. Our free workers’ comp calculator estimates your weekly disability benefit from your average weekly wage, state and injury type, using 2026 state caps. You can also look up weekly benefit rates for all 50 states and DC, or check whether a waiting period means you are owed retro pay. If you need injury-specific context, we have calculators for knee and shoulder injuries, and a guide on cervical fusion settlement values.

FAQ

What is a utilization review in workers’ comp?

It is the process an employer or claims administrator uses to decide whether recommended treatment is medically necessary. In states like California, every claims administrator must run a UR program under the Labor Code. The reviewer compares your doctor’s request and records against state treatment guidelines and then approves, modifies or denies it.

Can I appeal a UR denial?

In most states, yes, but the route differs. In Texas you typically complete an internal reconsideration with the carrier and then go to an independent review organization, except in life-threatening cases. In California, the DWC runs a separate review process after a denial. Check the notice for your deadline and appeal instructions.

Does my doctor’s recommendation guarantee approval?

No. UR tests medical necessity against state guidelines, and incomplete documentation can sink a reasonable request. Ask your doctor’s office to include clinical notes that explain why the treatment fits your specific condition.

Do CMS guidelines apply to UR?

Not for ordinary workers’ comp treatment decisions. CMS guidance applies to Workers’ Compensation Medicare Set-Aside arrangements, which concern protecting Medicare when a settlement covers future medical care.

Is a delayed UR decision always illegal?

Not necessarily. In California, administrators can extend the standard 5 business day review to 14 days to get more information, or up to 30 days for an additional exam or test. Compare any delay with your state’s actual rules before assuming a violation.

Sources

• California DWC: utilization review
• California DWC: UR FAQ for injured workers
• California DWC: attorney information
• California UR program filed under DWC rules
• Texas DI: non-network preauthorization and concurrent review process
• Texas DI: medical necessity disputes
• Texas DI: independent review organization FAQ
• Oregon DCBS: workers’ compensation disputes
• CMS: WCMSA Reference Guide
• CMS: workers’ compensation set-aside arrangements

Recommended

• U.S. Workers Comp Claim Denial: 8 Actions and a 2026 Payout Estimate
• Beat an Unfavorable IME in Workers’ Comp: 4 Steps for U.S. Workers
• Getting a Second Opinion on Your Workers’ Comp Payout
• MMI in Workers’ Comp: Run a Free 50-State Estimate Before You Settle