Utilization Review in California Workers' Compensation

What is Utilization Review and how does it work in California?

The insurer's review of a treating doctor's request for treatment to determine whether the requested care is medically necessary under California workers' comp guidelines.

Utilization Review under California Labor Code §4610 is the process by which a California workers' compensation insurer (or the insurer's UR organization) reviews each treatment request to determine whether it is medically necessary. UR applies to every treatment that requires authorization beyond the initial $10,000 the insurer must authorize within one day of the completed DWC-1 under California Labor Code §5402(c).

The UR review is conducted by a physician licensed in any U.S. state who has clinical expertise in the treatment under review. The reviewing physician applies the Medical Treatment Utilization Schedule (MTUS), California's evidence-based treatment guidelines published by the California Division of Workers' Compensation, to decide whether to approve, modify, deny, or delay the requested treatment. The MTUS covers most musculoskeletal, pain, neurological, and psychological conditions.

What are the actual UR timelines under California law?

Five business days for prospective requests, one business day for urgent care, and a longer review window for concurrent or retrospective requests.

UR is governed by strict timelines. Missing a UR timeline often means the requested treatment is deemed authorized, which is a powerful argument for the worker.

Prospective UR, before treatment

For a non-urgent treatment request, the insurer must issue a UR decision within 5 working days of receipt of the Request for Authorization, with limited extensions. The decision is then served on the worker, the treating physician, and the worker's attorney. A UR decision that is not issued within the statutory window is generally not enforceable, and the treatment may be deemed authorized by operation of law.

Expedited UR, urgent treatment

For urgent treatment, where the worker's condition could reasonably jeopardize life, health, or ability to regain function, the insurer must issue an expedited UR decision within 72 hours of receipt of the request. The expedited timeline is real and enforceable; a delay can support a 25% penalty under California Labor Code §5814 for unreasonably delayed benefits.

Retrospective UR, after treatment

For treatment that has already been provided, the insurer has 30 days from receipt of the bill to issue a retrospective UR decision. Retrospective UR is often used to deny treatment a worker received in emergency situations without prior authorization.

What does a UR denial letter look like and what must it contain?

The letter states the requested treatment, the reviewer's name and qualification, the specific guideline cited, and the IMR appeal rights and thirty-day deadline.

A valid UR denial letter must include specific information under California law: the clinical reasons for the denial, the specific MTUS guideline citations relied on, the name and credentials of the reviewing physician, the date of the request and the date of the decision, and detailed instructions for filing an Independent Medical Review (IMR) appeal under California Labor Code §4610.5. A UR denial letter that omits any of these is procedurally defective.

The IMR right is critical. Within 30 days of receipt of the UR denial under California Labor Code §4610.5, the worker can appeal to IMR, where an independent physician reviews the medical record and either upholds or overturns the denial. The IMR decision is binding with narrow appeal grounds.

How does a specialist actually fight a UR denial?

The treating physician's records, peer-reviewed literature, and a structured IMR appeal package establish medical necessity under the workers' comp treatment guidelines.

A specialist attorney fights UR denials on four fronts. First, by working with the treating physician to write Requests for Authorization that explicitly cite MTUS guidelines, document failed conservative care, and include objective findings, imaging, exam findings, functional limitations. Second, by filing IMR appeals on the 30-day deadline and submitting supplemental medical evidence directly to the IMR organization. Third, by documenting patterns of unreasonable delay or repeated denials for treatment a QME or AME under California Labor Code §4062.2 has stated is necessary, which can support a California Labor Code §5814 penalty. Fourth, by challenging procedurally defective UR decisions directly at the WCAB.

What if the insurer keeps denying treatment after IMR overturns?

Repeated denials of the same treatment after an IMR reversal expose the insurer to penalties and support a Petition for Reconsideration or sanctions.

An IMR overturn is binding and the treatment must be authorized. If the insurer fails to comply, the worker can file an enforcement motion at the WCAB and seek penalties under California Labor Code §5814 for unreasonably delayed benefits. Persistent post-IMR delays can also support a California Labor Code §132a retaliation petition if the pattern is tied to the worker's claim, providing reinstatement, lost wages, an increase in compensation of up to $10,000, and costs up to $250. After an adverse Findings and Award, a Petition for Reconsideration is filed within 25 days of service by mail (or 20 days from electronic service) under California Labor Code §5903.

What about emergency treatment without prior UR authorization?

Emergency care proceeds without prior authorization and must be paid by the insurer regardless of the UR process, as long as documentation establishes the emergency.

California law does not require prior UR authorization for emergency medical treatment. Under California Labor Code §4600, the employer must provide all medical treatment reasonably required to cure or relieve the injury, emergency care for a work injury is owed regardless of prior authorization. Retrospective UR may later review the emergency care, but a defensible emergency-room visit is generally upheld. The worker should keep all bills, discharge instructions, and follow-up records, and let the attorney handle reimbursement or lien resolution.

Related on yazdchilaw.com: California workers' compensation lawyer pillar · What is mmi maximum medical improvement · what MMI means in California workers' comp · California Independent Medical Review (IMR) explained · California Labor Code §3600 explained.