Denied Claim Reversal — A California Workers' Comp Case Study

How the statutory framework applied

Denial moved the claim to the medical-legal evaluation pathway, the QME report tied the injury to work and the carrier reversed the denial after the report issued.

Several California Labor Code sections layered together on a denied claim reversal case.

The §5402(b) 90-day investigation window

§5402(b) gives the insurer 90 days from the filing of the DWC-1 claim form to investigate and accept or deny the claim. A claim not denied within the 90-day window is presumed compensable, subject to limited rebuttal. When the insurer denies within the 90-day window, the denial sets up the litigation framework, but it does not end the case. The worker can develop medical-legal evidence, request a QME under California Labor Code §4062.2, and proceed to a WCAB Expedited Hearing or trial on the threshold compensability issue.

QME development under §4062.2

When the parties dispute a medical issue, including compensability of the injury itself, and the worker is represented, California Labor Code §4062.2 controls the QME selection process. The parties receive a panel of three QMEs from the Division of Workers' Compensation, and the worker's attorney and the insurer's defense counsel each strike one, with the remaining QME conducting the evaluation. The QME report on the compensability issue is often the single most important piece of evidence in a denied-claim reversal, a well-supported QME conclusion that the injury arose out of and in the course of employment under California Labor Code §3600 usually overcomes the defense's evaluation.

The §5402(c) $10,000 treatment obligation pre-denial

Under §5402(c), the employer is required to authorize up to $10,000 in medical treatment within one working day of receiving the completed DWC-1, even before the insurer has accepted or denied the claim. That $10,000 obligation is recoverable even if the claim is ultimately denied, and aggressive use of the $10,000 in the early days of a contested claim builds the initial medical record that supports later compensability work.

Penalty exposure under §5814

Unreasonable delay in providing temporary disability indemnity under California Labor Code §4653, medical care under California Labor Code §4600, or any other benefit can support a 25% penalty under California Labor Code §5814 on the unreasonably delayed payment. When a denied claim is reversed at the WCAB, the worker's attorney often pursues California Labor Code §5814 penalties on the months of withheld temporary disability and unauthorized medical bills as part of the recovery framework. The California Labor Code §5814 layer adds meaningful additional value on a denied-claim reversal.

Permanent disability rating under §4660

Once compensability is established, the case develops into a normal California workers' compensation claim, the QME or AME assigns a Whole Person Impairment under the AMA Guides 5th Edition, California Labor Code §4660 controls the rating with adjustments for age, occupation, and diminished future earning capacity, and California Labor Code §4663 controls the apportionment analysis. The permanent disability indemnity reflects the actual final impairment, not the impairment the defense initially argued.

Resolution by Compromise and Release under §5001 / §5003

Many denied-claim reversal cases ultimately resolve by Compromise and Release under California Labor Code §5001 and California Labor Code §5003 rather than Stipulated Award. The C&R structure makes sense on a reversed case because the worker generally wants a clean break from the insurer that denied the claim, a lump sum closing all future benefits, including California Labor Code §4600 future medical care, with a Medicare Set-Aside where applicable. The C&R bundle on a denied-claim reversal typically includes the unpaid temporary disability, permanent disability indemnity, valued future medical, California Labor Code §5814 penalty exposure where supported, and the California Labor Code §4658.7 SJDB voucher.

California's 2025 statutory maximum temporary disability rate is $1,680.29 per week (DIR statutory adjustment, January 2025), with a corresponding minimum of $252.03, the floor and ceiling that anchor every two-thirds-of-AWW TD calculation under California Labor Code §4653.

Related reading: California pillar guide · §5402(b) explainer.

Related on yazdchilaw.com: California workers' compensation lawyer pillar · California Labor Code §5400.30 explained · California Labor Code §3700.6 explained · what to do if you can't go back to work after a workers' comp injury.