How to File a Workers' Compensation Claim in California
Reviewed by DocDraft Legal Team · California · Last updated 2026-09-07
A workers' compensation claim is how an employee who is injured on the job, or made ill by work, obtains medical care and wage-replacement benefits from the employer's insurer, without having to prove the employer was at fault. In California, the system is administered by the Division of Workers' Compensation (DWC) within the Department of Industrial Relations (DIR), and disputes are decided by the Workers' Compensation Appeals Board (WCAB). Two deadlines are critical. You must give your employer written notice of the injury within 30 days of the occurrence (Cal. Labor Code 5400), and you generally have one year from the date of injury to commence proceedings before the WCAB (Cal. Labor Code 5405). After you report the injury, the employer must give you a DWC-1 claim form within one working day (Cal. Labor Code 5401). You complete and file the DWC-1 to open the claim, the insurer decides to accept, delay, or deny it, and if it is disputed you file an Application for Adjudication of Claim with the WCAB. Attorney review of your claim is available through DocDraft.
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How do I file a workers' compensation claim in California?
First, report your injury to your employer in writing within 30 days (Cal. Labor Code 5400). Your employer must then give you a DWC-1 claim form within one working day. Complete the DWC-1, return it to your employer to open the claim, and the insurer decides whether to accept it.
How long do I have to file a workers' compensation claim in California?
Two deadlines matter. You must give your employer written notice within 30 days of the injury (Cal. Labor Code 5400). Separately, you generally have one year from the date of injury to commence proceedings before the Workers' Compensation Appeals Board (Cal. Labor Code 5405). Missing either can bar your benefits.
What is the DWC-1 claim form in California?
The DWC-1 is California's official Workers' Compensation Claim Form. After you report an injury, your employer must give you the DWC-1 within one working day (Cal. Labor Code 5401). You complete the employee section, describe the injury, and return it to your employer, which opens your claim and starts the insurer's review.
Who handles workers' compensation claims in California?
California's workers' compensation system is administered by the Division of Workers' Compensation (DWC), part of the Department of Industrial Relations (DIR). Your employer's insurer, called the claims administrator, decides your claim day to day. If a dispute arises, the Workers' Compensation Appeals Board (WCAB) adjudicates it after you file an application.
California workers' compensation claim law at a glance
In California, workers' compensation gives an employee who is injured on the job medical care and wage-replacement benefits from the employer's insurer, regardless of fault. The system is run by the Division of Workers' Compensation (DWC) within the Department of Industrial Relations (DIR), and contested claims are decided by the Workers' Compensation Appeals Board (WCAB). You must serve your employer with written notice of the injury within 30 days of its occurrence (Cal. Labor Code 5400). Once notified, the employer must provide a DWC-1 claim form within one working day (Cal. Labor Code 5401). You then file the DWC-1 to open the claim. If the claim is disputed, you generally have one year from the date of injury to commence proceedings before the WCAB (Cal. Labor Code 5405).
Filing a California workers' compensation claim after a warehouse back injury
Suppose you hurt your back lifting boxes at a California warehouse. You tell your supervisor and, the same week, give written notice of the injury, staying well inside the 30-day reporting deadline (Cal. Labor Code 5400). Within one working day, your employer hands you a DWC-1 claim form (Cal. Labor Code 5401). You complete the employee section, describe the injury, keep a copy, and return the form to open your claim. The insurer starts paying for medical treatment but later disputes how much wage-replacement you are owed. Because you must act within one year of the injury (Cal. Labor Code 5405), you file an Application for Adjudication of Claim with the WCAB. Attorney review of your claim is available through DocDraft.
Relevant Laws
Cal. Labor Code 5400 (30-day notice of injury to employer)
Provides that no claim to recover workers' compensation may be maintained unless, within 30 days after the occurrence of the injury claimed to have caused the disability or death, written notice is served upon the employer.
Cal. Labor Code 5401 (employer must provide the DWC-1 claim form)
Requires the employer, within one working day of receiving notice or knowledge of an injury that causes lost time beyond the shift or medical treatment beyond first aid, to provide the injured employee a claim form (DWC-1) and a notice of potential eligibility for benefits.
Cal. Labor Code 5405 (one-year period to commence proceedings)
Sets a one-year period within which proceedings may be commenced to collect benefits, running from the date of injury, the expiration of any period covered by disability indemnity payments, or the last date medical benefits were furnished, whichever is latest.
California Division of Workers' Compensation, Injured Worker information
The DWC injured-worker page instructs employees to report the injury or illness to their employer, warns that failing to report within 30 days could cost you your right to workers' compensation benefits, and outlines the claim process administered by the DWC within DIR.
Regional Variances
California workers' compensation claim rules at a glance
Reporting deadline
30 calendar days from the occurrence of the injury to serve your employer with written notice, under Cal. Labor Code 5400. Failing to report within 30 days can cost you your right to benefits.
Claim form
The DWC-1 Workers' Compensation Claim Form. The employer must provide it within one working day of notice of the injury (Cal. Labor Code 5401). You complete it and return it to open the claim.
Filing deadline
Generally one year from the date of injury to commence proceedings before the Workers' Compensation Appeals Board (Cal. Labor Code 5405). The period can also run from the last disability or medical benefit provided.
Who administers it
The Division of Workers' Compensation (DWC), within the Department of Industrial Relations (DIR). Disputes are adjudicated by the Workers' Compensation Appeals Board (WCAB).
How disputes are filed
By filing an Application for Adjudication of Claim with the WCAB when the insurer denies, delays, or underpays the claim. This must occur within the one-year period under Cal. Labor Code 5405.
Suggested Compliance Checklist
Report the injury to your employer in writing
Within 30 days of the injury days after startingGive your employer written notice of the injury within 30 calendar days of its occurrence (Cal. Labor Code 5400). The Division of Workers' Compensation warns that reporting late could cost you your right to benefits, so do this immediately and keep a dated copy.
Get the DWC-1 claim form from your employer
Within one working day of reporting days after startingYour employer must give you a DWC-1 Workers' Compensation Claim Form within one working day of notice (Cal. Labor Code 5401), plus a notice of potential eligibility. If it does not arrive, request the form in writing and note the date you asked.
Complete and file the DWC-1
As soon as you receive the form days after startingFill out the employee section of the DWC-1, describing the injury and affected body parts, sign and date it, and return it to your employer to open the claim. Keep a copy. Attorney review of your claim is available through DocDraft.
Get medical care and keep records
Ongoing after the injury days after startingSeek treatment for your injury and keep every medical record, bill, and letter from the insurer. Documenting the diagnosis, treatment dates, and any work restrictions supports your claim if the claims administrator later disputes benefits.
Track the insurer's decision and deadlines
While the claim is pending days after startingThe claims administrator will accept, delay, or deny your claim. Calendar any deadline the insurer sets for information, keep proof of what you sent, and note the date of injury so you can protect the one-year filing window under Cal. Labor Code 5405.
File an Application for Adjudication if disputed
Within one year of the date of injury days after startingIf the claim is denied, delayed, or underpaid, commence proceedings before the Workers' Compensation Appeals Board by filing an Application for Adjudication of Claim within one year of the injury (Cal. Labor Code 5405). File early to protect your rights.
| Task | Description | Document | Days after starting |
|---|---|---|---|
| Report the injury to your employer in writing | Give your employer written notice of the injury within 30 calendar days of its occurrence (Cal. Labor Code 5400). The Division of Workers' Compensation warns that reporting late could cost you your right to benefits, so do this immediately and keep a dated copy. | - | Within 30 days of the injury |
| Get the DWC-1 claim form from your employer | Your employer must give you a DWC-1 Workers' Compensation Claim Form within one working day of notice (Cal. Labor Code 5401), plus a notice of potential eligibility. If it does not arrive, request the form in writing and note the date you asked. | - | Within one working day of reporting |
| Complete and file the DWC-1 | Fill out the employee section of the DWC-1, describing the injury and affected body parts, sign and date it, and return it to your employer to open the claim. Keep a copy. Attorney review of your claim is available through DocDraft. | - | As soon as you receive the form |
| Get medical care and keep records | Seek treatment for your injury and keep every medical record, bill, and letter from the insurer. Documenting the diagnosis, treatment dates, and any work restrictions supports your claim if the claims administrator later disputes benefits. | - | Ongoing after the injury |
| Track the insurer's decision and deadlines | The claims administrator will accept, delay, or deny your claim. Calendar any deadline the insurer sets for information, keep proof of what you sent, and note the date of injury so you can protect the one-year filing window under Cal. Labor Code 5405. | - | While the claim is pending |
| File an Application for Adjudication if disputed | If the claim is denied, delayed, or underpaid, commence proceedings before the Workers' Compensation Appeals Board by filing an Application for Adjudication of Claim within one year of the injury (Cal. Labor Code 5405). File early to protect your rights. | - | Within one year of the date of injury |
Frequently Asked Questions
A workers' compensation claim is how an employee injured on the job, or made sick by work, obtains medical care and wage-replacement benefits from the employer's insurer, without proving fault. In California, you open a claim by reporting the injury and filing the DWC-1 form, and disputes are decided by the Workers' Compensation Appeals Board.
Reporting means giving your employer written notice of the injury, which you must do within 30 days (Cal. Labor Code 5400). Filing the claim is the separate step of completing the DWC-1 form and returning it to your employer to open the case. Reporting comes first; filing the DWC-1 follows.
You have 30 calendar days from the occurrence of the injury to serve your employer with written notice (Cal. Labor Code 5400). The Division of Workers' Compensation warns that if you do not report within 30 days, you could lose your right to workers' compensation benefits, so report promptly.
Generally, you have one year from the date of injury to commence proceedings before the Workers' Compensation Appeals Board (Cal. Labor Code 5405). The one-year period can also run from the last date disability payments or medical benefits were furnished, whichever is latest. Missing it can bar your claim.
Reporting after 30 days can jeopardize your claim. Cal. Labor Code 5400 says no claim for compensation shall be maintained unless written notice is served within 30 days of the injury. The Division of Workers' Compensation warns you could lose your right to benefits, so report as soon as you can.
Day to day, your employer's insurer, the claims administrator, decides whether to accept, delay, or deny the claim. If you disagree, the Workers' Compensation Appeals Board (WCAB), part of the Division of Workers' Compensation, resolves the dispute after you file an Application for Adjudication of Claim.
No. California workers' compensation is a no-fault system, so you do not have to prove your employer did anything wrong to receive benefits. You generally need to show the injury arose out of and in the course of your employment. In exchange, benefits are set by statute rather than a jury.
If the claims administrator denies or delays your claim, you can take it to the Workers' Compensation Appeals Board by filing an Application for Adjudication of Claim. You generally must do so within one year of the date of injury (Cal. Labor Code 5405). Attorney review of your case is available through DocDraft.
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