California Workers' Comp Filing Deadlines

What deadlines control a California workers' comp case?

The key clocks cover injury notice, claim filing, insurer decision, treatment appeal, QME steps, reconsideration, and court review.

Workers' compensation deadlines are easy to miss because they start from different events. Some start when the injury happens. Some start when a form is served. Others start when a denial letter or judge decision arrives.

A missed date does not always end the case, but it can change the fight. Instead of proving the injury and benefits, the worker may first have to explain delay. That takes time and gives the insurer leverage.

This page is a practical clock list. It is not a substitute for advice about your exact service date or injury date. If a deadline is close, call Yazdchi Law at (661) 273-1780 before assuming the claim is safe or lost.

What are the main deadline triggers?

The trigger event matters. A work injury, completed DWC-1, UR denial, QME panel, or judge decision can each start a clock.

The first trigger is the injury itself. Labor Code 5400 covers notice to the employer. Labor Code 5405 covers the filing limit for many claims. For cumulative trauma, Labor Code 5412 can change the date because knowledge and disability both matter.

The next trigger is the completed DWC-1. That document starts the insurer's decision process under Labor Code 5402. If the insurer sits on the claim, the law may treat the claim as accepted after the decision period. That is why proof of delivery matters so much.

Later triggers are document-based. A utilization review denial can start the IMR clock under Labor Code 4610.5. A QME panel service date can start the strike period under Labor Code 4062.2. A judge's decision can start reconsideration time under Labor Code 5903.

Which deadline is most dangerous for new claims?

The earliest dangerous deadline is injury notice. A late report gives the insurer a simple defense before medical facts are developed.

Workers often lose time because they hope pain will fade. A shoulder strain becomes a tear. A back twinge becomes leg pain. A wrist ache becomes numbness. By the time the worker reports it, the employer may claim the injury happened somewhere else.

Written notice is the best protection. A short message to a supervisor can show that the employer knew. If the employer had actual knowledge, or if the delay caused no real prejudice, a late notice defense may fail. Still, fighting about notice is harder than reporting early.

The claim filing deadline is separate. Labor Code 5405 often becomes the bigger issue when a worker never files the DWC-1, waits after leaving the job, or learns later that a slow-developing condition was work-related. Cumulative trauma claims need special date analysis under Labor Code 5412.

What deadlines apply after treatment is denied?

A treatment denial can require a fast IMR request, so the worker should save the denial letter and act immediately.

Treatment disputes often arrive by mail or claims portal. The letter may say a request was denied, modified, or delayed after utilization review. That letter is not just an explanation. It can be the document that starts the next deadline.

Labor Code 4610.5 controls Independent Medical Review for many utilization review denials. The worker should not wait for the next doctor visit to ask what the letter means. Save the envelope, denial pages, fax cover sheet, and portal notice. The service date can matter.

What deadlines apply after a judge rules?

After a judge decision, reconsideration time is short. The deadline usually runs from service, not from when you read it.

A Findings and Award or other final decision can start a fast appeal clock. The worker must read the proof of service, not just the first page of the decision. Mail and electronic service can produce different deadline calculations.

Reconsideration is technical. The petition must identify legal grounds, not just disappointment with the outcome. If reconsideration is denied, court review has another time limit. Because these steps are unforgiving, workers should seek help the day a judge decision arrives.

The safest system is simple: save every envelope, photograph every first page, write down the service date, and calendar a reminder before the deadline. Do not assume the adjuster, doctor, or employer is tracking it for you.

How can a worker avoid missing these dates?

Keep a deadline file with the injury date, report date, DWC-1 date, denial dates, service proofs, and hearing papers.

Yazdchi Law tracks deadline issues for workers tied to Van Nuys, Los Angeles, Long Beach, Pomona, San Bernardino, Riverside, and Oxnard WCAB districts. The firm reviews service dates, claim forms, medical letters, and hearing decisions before deciding the next step.

Eman Yazdchi is a Certified Specialist in workers' compensation law, certified by the California Board of Legal Specialization, State Bar of California. Call (661) 273-1780 if a denial, IMR form, QME panel, or judge decision just arrived. The sooner the date is checked, the more options usually remain.

Do not guess from the title of a document. Some letters look routine but start a deadline. Other letters sound threatening but do not require an immediate legal filing. The proof of service, mailing method, and type of decision all need to be read together.

Workers should also keep the whole envelope or electronic notice. A scan of only the first page may omit the service date. When the issue is close, that missing service proof can become the difference between a timely filing and an argument about whether the paper arrived too late.

If several clocks are running, the firm triages the deadline that can close first. Treatment appeals, judge decisions, and QME panel actions may require faster attention than general claim development. Sorting the dates in order keeps a worker from fixing one problem while another deadline expires.

A deadline review also checks whether the worker is dealing with a claim deadline, a benefit deadline, or an appeal deadline. Those categories require different responses. Calling every problem a filing deadline can lead to the wrong fix.

Even a short consult can confirm which paper starts the clock and which proof should be saved before the next filing is prepared.