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✦ Certified Specialist in Workers’ Compensation Law — Certified by the State Bar of California, Board of Legal Specialization ✦
A denial is not the end. It’s the beginning of our fight for your benefits.
By Eman Yazdchi, Esq. · Certified Specialist in Workers' Compensation Law, State Bar of California Board of Legal Specialization
In California, a Sylmar workers' comp denial runs on three clocks: §4610.5 IMR appeal in 30 days, §5903 Petition for Reconsideration in 25 days mailed / 20 electronic, and §5402(b) 90-day insurer decision presumption. Yazdchi Law, a Certified Specialist in Workers' Compensation Law firm, files these at the Sylmar WCAB. Request a free case review.
The deadline structure on a Sylmar workers' comp denial: §5402(b) 90-day insurer decision window from DWC-1 filing under California Labor Code §5402 (silence converts to presumption); §5402(c) one-day immediate-medical $10,000 floor regardless of the 90-day status; §4610.5 IMR appeal 30 days from UR decision through Maximus under California Labor Code §4610 mechanics; §5903 Petition for Reconsideration 25 days mailed / 20 electronic on a WCJ adverse trial decision. The §5402(b) and §5402(c) clocks run on insurer action; the §4610.5 and §5903 clocks run on appellate action.
On a Sylmar industrial-corridor warehouse picker's cumulative-trauma back case, the deadline-math fight typically focuses on the §5402(b) presumption record — the dated DWC-1 receipt, the dated QME-panel activity under California Labor Code §4062.2, the dated UR cycles under California Labor Code §4610. When the insurer's reasonable-diligence record is weak, the presumption converts to compensable status at the Sylmar WCAB through an Application for Adjudication. The §5814 25% penalty under California Labor Code §5814 layers on the benefit-delay record once compensability is established.
Yazdchi Law's office at 1125 W Avenue M-14, Suite A in Palmdale serves the Sylmar WCAB on denied-claim files. Eman Yazdchi handles the §5402(b) presumption fight, the §4610.5 IMR cycle, and the §5903 Petition for Reconsideration phase, and is a Certified Specialist in Workers' Compensation Law, certified by the California Board of Legal Specialization, State Bar of California.
A denied Sylmar workers' comp claim is built around five California Labor Code sections that do most of the work: California Labor Code §5402(b) (the 90-day decision-window presumption), California Labor Code §4610.5 (Independent Medical Review on UR denials), California Labor Code §5814 (the 25% penalty on unreasonable delay), California Labor Code §5900 (the framework section authorizing reconsideration), and California Labor Code §5903 (the 25-day/20-day Petition for Reconsideration deadline).
Under California Labor Code §5402(b), the 90-day insurer decision window starts on the day the Sylmar worker files the DWC-1 — not the day the insurer receives it. On an Olive View-UCLA Medical Center patient-handler's lumbar disability claim, the §5402(b) presumption is the strongest tool against a Sylmar denial when the insurer dragged the QME process under California Labor Code §4062.2 or sat on a UR cycle under California Labor Code §4610 past the 90-day line. The presumption is rebuttable only by evidence the insurer could not have discovered with reasonable diligence during the 90 days — a high evidentiary bar at the Sylmar district WCAB. Under California Labor Code §5402(c), the insurer also owes up to $10,000 in immediate medical treatment within one day of the DWC-1, regardless of the 90-day timer, and any delay on that duty surfaces a separate §5814 25% penalty exposure on the Olive View-UCLA patient-handling spinal injuries and Sylmar warehouse picker back cases record.
When a Sylmar insurer's Utilization Review under California Labor Code §4610 denies treatment, the appeal route is Independent Medical Review under California Labor Code §4610.5 — 30 days from the UR decision, through Maximus, decided by an independent physician on the Medical Treatment Utilization Schedule standard. The IMR ruling binds the parties except on the five California Labor Code §4610.6 grounds: fraud, material conflict of interest, constitutionally-protected-basis bias, mistake of fact outside expert opinion, or plainly erroneous fact-finding. The WCAB cannot compel treatment authorization while IMR is pending — IMR is procedurally exclusive.
A Sylmar workers' comp denial typically surfaces multiple §5814 25% penalty triggers under California Labor Code §5814 simultaneously. Each delayed benefit gets its own 25% penalty calculation: temporary disability under California Labor Code §4650 not paid on the bi-weekly schedule, medical treatment under California Labor Code §4600 not authorized within the §5402(c) one-day duty or after the §5402(b) 90-day decision-window lapsed, permanent disability advances under California Labor Code §4658 held past the regulatory schedule. The Sylmar WCAB applies the penalty per-benefit after focused evidentiary findings on the delay record.
On an Olive View-UCLA Medical Center patient-handler's lumbar disability claim, the Sylmar Petition for Reconsideration under California Labor Code §5900 runs on the California Labor Code §5903 clock: 25 days from mail service of the adverse WCJ decision, 20 days if served electronically via EAMS under Title 8 CCR section 10605. The Petition specifies the §5903 grounds — newly discovered evidence, fraud, the WCJ acting without or in excess of powers, an unreasonable factual finding, an error of law, or insufficient or excessive findings. On Olive View-UCLA / Sylmar industrial corridor files, the most-cited grounds are unreasonable factual findings on §5402(b)-presumption rebuttal and errors of law on §4663 apportionment or §4660 occupational-variant calls. The WCAB either modifies or denies; denial opens the §5950 Writ of Review within 45 days.
Injured at work in Sylmar? Call (661) 273-1780
Tap to call →Sylmar denied-claim appeals are heard at the Van Nuys district office of the Workers' Compensation Appeals Board at 15400 Sherman Way, Suite 500, Van Nuys. Yazdchi Law appears at the Van Nuys WCAB on Sylmar denial appeals regularly, including those involving the California Labor Code §5402(b) 90-day presumption, the California Labor Code §5814 25% penalty, hospital California Labor Code §6403.5 patient-handling claims, and the California Labor Code §5903 25-day/20-day Petition for Reconsideration deadline. Related coverage: Sylmar workers' comp claims.
The §5402(b) 90-day insurer decision window starts the day the Sylmar worker files the DWC-1, not the day the insurer receives it. On an Olive View-UCLA Medical Center patient-handler's lumbar disability claim, common Sylmar healthcare, Sylmar industrial warehouse, and I-5/210-corridor trucking insurers hold the file open on QME-panel timing under California Labor Code §4062.2 or UR cycles under California Labor Code §4610 — both of which can blow past 90 days. Under California Labor Code §5402(b), once the window passes, the injury is presumed compensable, rebuttable only by reasonable-diligence evidence. Under California Labor Code §5402(c), $10,000 of immediate medical treatment is owed within one day of the DWC-1 regardless of the 90-day status.
The §5814 25% penalty record on a Sylmar denial is built on the dated benefit-payment ledger: when temporary disability under California Labor Code §4650 was due, when it was paid, when treatment under California Labor Code §4600 was requested, when UR ruled, when the §5402(c) one-day medical duty triggered. On a Sylmar industrial-corridor warehouse picker's cumulative-trauma back case, each delay becomes a separate §5814 trigger. The Olive View-UCLA patient-handling spinal injuries and Sylmar warehouse picker back cases produces benefit-delay patterns that the Sylmar WCAB sees frequently and rules on with focused evidentiary hearings.
Last reviewed by Eman Yazdchi, Esq., May 2026.
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