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What Is California Labor Code §5903: the 25-Day Reconsideration Deadline?
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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
At any time within 20 days after the service of any final order, decision, or award made and filed by the appeals board or a workers' compensation judge granting or denying compensation, or arising out of or incidental thereto, any person aggrieved thereby may petition for reconsideration upon one or more of the following grounds and no other: (a) That by the order, decision, or award made and filed by the appeals board or the workers' compensation judge, the appeals board acted without or in excess of its powers. (b) That the order, decision, or award was procured by fraud. (c) That the evidence does not justify the findings of fact.
What does Labor Code 5903 require?
Labor Code 5903 sets the short deadline and statutory grounds for asking the WCAB to reconsider a final decision.
A workers' compensation judge's decision can change the value and direction of a claim. Labor Code 5903 gives an aggrieved party a way to ask the Workers' Compensation Appeals Board to review it, but the window is measured in days.
The basic statutory period is 20 days after service. Mail-service rules can add time in many situations, which is why workers often hear 25 days. The proof of service decides the calendar. Never assume the longer period applies without checking the service method.
The petition also needs a statutory ground. It is not enough to say the result feels unfair. Eman Yazdchi is a Certified Specialist in workers' compensation law, certified by the California Board of Legal Specialization, State Bar of California.
How do you calendar the deadline?
Start with the service date on the proof of service, then apply the service method rules before the last filing day.
Find the final order, decision, or award. Then find the proof of service. The date on that proof is the first calendar fact. If service was by mail, California procedure often adds five days. If service was electronic, that extra mail time may not apply.
Because reconsideration affects appellate rights, the conservative move is to prepare for the earliest plausible deadline. A late petition may be denied without any review of the merits.
What grounds can support reconsideration?
The petition must tie the requested review to a listed ground, such as excess powers, fraud, unsupported evidence, new material evidence, or unsupported findings.
Current Labor Code 5903 lists five express grounds. A legal error is usually framed through those grounds. For example, the judge may have relied on findings that the evidence does not support, or the findings may not support the award that was entered.
New evidence is narrow. The petition must explain why the evidence is material and why reasonable diligence could not have produced it at the hearing.
What should the petition include?
A useful petition identifies the decision, the exact error, the record support, the statutory ground, and the requested fix.
The Appeals Board reviews the record. A petition that wanders through frustration without record citations is weak. The best version names the finding, quotes or cites the evidence, explains the legal problem, and asks for a concrete result.
Common topics include injury findings, permanent disability ratings, apportionment, temporary disability, penalties, credit, liens, and whether a medical report is substantial evidence.
What happens after filing?
The workers' compensation judge may prepare a report, and the Appeals Board can deny, grant, amend, rescind, or return the case.
The other side may answer. The judge may write a report and recommendation. The Appeals Board then decides whether reconsideration should be denied or granted. If review is granted, the board can change the decision or send the case back for more proceedings.
Later court review has its own separate deadline and rules. Do not wait for the reconsideration result to start preserving the next calendar.
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Tap to call →Frequently Asked Questions
Is the Labor Code 5903 deadline 20 days or 25 days?
The statute says 20 days after service. In many mailed decisions, service rules add five days, which is why lawyers often calendar 25 days. Electronic service can be shorter. Always check the proof of service.
Can I file reconsideration just because I disagree?
No. The petition must fit a statutory ground and explain the error with record support. General disagreement or disappointment is not enough for WCAB reconsideration.
Can I use new medical evidence?
Sometimes, but the standard is narrow. The evidence must be material, and the petition must explain why reasonable effort could not have produced it before the hearing.
What happens if the petition is late?
A late petition can be dismissed without review of the facts. That is why the decision, proof of service, envelope, and electronic notice should be reviewed immediately.
What documents should I bring for a reconsideration review?
Bring the judge's decision, proof of service, trial minutes, exhibits, medical reports, rating instructions, prior orders, settlement papers, and every WCAB notice tied to the disputed decision.
Last reviewed by Eman Yazdchi, Esq., July 2026.
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