In California workers' compensation, a denied surgery or treatment request rarely ends up in front of a judge in the first instance. Medical necessity disputes are routed through utilization review and independent medical review, a system that gives the applicant's attorney limited leverage and punishes missed procedural steps. Understanding the sequence and the narrow places where the Workers' Compensation Appeals Board can intervene is essential for anyone handling treatment disputes.
The Sequence
The treating physician submits a request for authorization, known as an RFA, on the form prescribed by the Division of Workers' Compensation. The claims administrator may approve it or send it to utilization review. A UR physician reviews the request against the Medical Treatment Utilization Schedule, known as the MTUS, and any other evidence-based guidelines, and issues a decision to approve, modify, or deny. Statutory and regulatory deadlines apply, generally five working days for prospective review after receipt of the necessary information, with shorter timelines for urgent requests and longer ones for retrospective review. Confirm the current timeframes in the Labor Code and administrative regulations before relying on them.
If UR denies or modifies the request, the applicant may seek independent medical review by filing the application with the state's IMR vendor within thirty days of the UR decision. IMR is conducted by physicians who are not employees of the claims administrator. If the IMR reviewer upholds the denial, that determination is final and binding except in limited circumstances.
Why the Process Favors Early Precision
Two features of the system make front-end work critical. First, UR and IMR decisions generally turn on whether the request is consistent with the MTUS or other medical evidence cited. A request that does not address the guidelines is easy to deny. Second, IMR reviews the record that is submitted, so supplementing the record late is difficult.
Practical steps for the treating physician and the attorney include the following:
- Ensure the RFA is complete and legible, with the diagnosis, the specific treatment requested, and the clinical findings that support it.
- Include a narrative explaining why the MTUS recommendation applies, or why the case warrants an exception supported by peer-reviewed evidence. The MTUS includes a process for departing from the guidelines when the evidence supports it.
- Attach imaging, test results, and prior treatment history demonstrating failed conservative care.
- Keep a log of the RFA submission date and method, since timeliness defenses depend on it.
Timeliness: The Exception That Opens the Door
The most important opening for the WCAB arises when the claims administrator's UR decision is untimely. The Appeals Board has held, and California appellate authority has recognized, that an untimely UR decision is invalid and the issue of medical necessity may then be determined by the WCAB rather than being relegated to IMR. The case law on this point is well known to comp practitioners, but its details, including what counts as a complete RFA and when the clock begins, are heavily litigated. Because the defense has procedural defenses of its own, such as an incomplete RFA or a request submitted on an old form, be prepared to prove the submission date and the content of the request.
Gather proof of delivery, fax confirmations, portal receipts, and any communications from the adjuster. A well-organized timeline can resolve the question quickly at a hearing.
Other Grounds for Challenging a Denial
Aside from timeliness, there are limited grounds for appealing an IMR determination to the WCAB. These include that the administrative director acted without or in excess of its powers, that the determination was procured by fraud, that the reviewer had a conflict of interest, that it was the result of bias on the basis of race, national origin, or other protected characteristics, or that it resulted from a plainly erroneous express or implied finding of fact that is a mistake of fact and not a matter of medical opinion. Petitions must be filed within thirty days of the mailing of the determination. These grounds are narrow, and most petitions fail, but they matter when a reviewer misread the record or ignored a submitted report.
Where an IMR determination is overturned on those grounds, the typical remedy is a new IMR review with a different reviewer rather than an order for treatment.
Using Strategic Alternatives
When UR and IMR are not viable, practitioners consider other routes. Requesting authorization for different but related treatment, submitting supplemental narrative with new clinical findings, or obtaining a panel QME or agreed medical evaluator opinion on future medical needs can change the facts. Settlement structure also matters. Where treatment is repeatedly denied, a stipulated award with future medical open, or a compromise and release with a negotiated amount for future care, may serve the client better, depending on the strength of the case and the client's ability to obtain care elsewhere. See our workers' comp coverage for settlement structure comparisons.
Interaction With Third-Party Cases
When the injured worker also has a third-party civil case, denied treatment can leave the client untreated for months. Some counsel arrange care through health insurance or lien-based providers and seek reimbursement later, but this has consequences for the employer's lien and credit and for the comp case. Coordinating with the civil team prevents unintended results, and our liens and settlement reporting addresses how comp liens are resolved in third-party settlements.
Practice Points
- Treat the RFA as the case. A well-drafted request is the best defense against denial.
- Calendar the 30-day IMR deadline from the UR decision date, and the 30-day petition deadline from the IMR determination.
- Check UR timeliness on every denial, and preserve proof of RFA submission.
- Verify current statutes, regulations, and appellate decisions, since this area changes through rulemaking and case law.