If you've been injured at work in California, the paperwork starts the moment the incident happens, and what you collect in the first days and weeks can determine whether your claim pays out in full, gets reduced, or gets denied entirely.
We've recovered over $150,000,000 for injured workers across Southern California. The cases that are hardest to win are almost never the ones with the worst injuries. They are the ones where the worker had no documentation.
This checklist covers every document that matters, why each one matters under California law, and what to do with it. Save it. Share it with your family. Then call (818) 794-9947 if you have questions about your specific situation.
Here are the 9 documents to gather after a work injury in California:
- Your completed DWC-1 claim form and its filing date
- The written injury report you gave your employer
- All medical records, from the first visit onward
- Work-status and restriction notes from your doctor
- Every medical bill and treatment receipt
- Pay stubs to document your wages before the injury
- Names and contact info of any witnesses
- A written timeline of how the injury happened
- All letters and notices from the insurer or adjuster
1. Your Completed DWC-1 Claim Form and Its Filing Date
The DWC-1 is the official California workers' comp claim form, and filing it is what legally opens your case with the DWC (Division of Workers' Compensation).
Under Cal. Lab. Code §5401, your employer must provide you with the DWC-1 form within one working day of learning about your injury. You fill out the employee section, sign it, and return it. Keep a physical or digital copy of the completed form, and note the exact date you handed it back.
Your employer must provide you with a DWC-1 form within one working day of learning about your injury, and you should keep a copy of the completed form with your filing date noted on it.
Why the filing date matters: Cal. Lab. Code §5405 gives you one year from the date of injury to file a workers' comp claim. If the insurer later disputes when you filed, your dated copy is the evidence that settles the argument.
Practical takeaway: Make two copies of your completed DWC-1, one for your records and one for a trusted family member or friend. Store them separately.
2. The Written Injury Report You Gave Your Employer
California law requires you to notify your employer of a work injury within 30 days of the incident under Cal. Lab. Code §5400. Miss that window without a valid excuse and you risk losing benefits entirely.
A verbal notice counts, but it is nearly impossible to prove later. A written injury report, submitted by email, text, or paper form and dated at the time you sent it, is proof. Note the date, time, location of the incident, what you were doing, and what part of your body was affected.
California law prohibits your employer from retaliating against you for filing a workers' comp claim under Cal. Lab. Code §132a, but only if you have documented proof that you reported the injury.
Employers sometimes dispute that they ever received notice. A written report with a timestamp eliminates that argument. It also protects you under Cal. Lab. Code §132a, which makes retaliation for filing a workers' comp claim illegal, because you have proof the report was made.
Practical takeaway: Email is ideal. An email creates an automatic timestamp, a delivery record, and a retrievable copy. If your workplace uses paper forms, photograph the completed form before you hand it in.
3. All Medical Records, From the First Visit Onward
Medical records from every visit, starting with the emergency room or urgent care on the day of the injury, are the single strongest proof that your injury is real, work-related, and serious.
Every treatment note, imaging report (X-ray, MRI, CT scan), diagnosis, prescription, and referral creates a chain of medical evidence connecting your workplace incident to your injury. Without that chain, the insurer can argue the injury happened elsewhere or predated your job.
Request copies of your records at every appointment. You are entitled to them under California law. Ask the treating physician to note in the records the history of how the injury occurred, that you were doing your job at the time, and what restrictions or limitations resulted.
If the insurer sends you to a doctor inside their Medical Provider Network (MPN), you still have rights. If you disagree with that doctor's opinion, you may be entitled to request a QME (qualified medical evaluator) through the WCAB (Workers' Compensation Appeals Board) process to get an independent assessment.
Practical takeaway: Start a dedicated folder, physical or digital, the day you get hurt. Every medical document goes in chronologically, starting with the first visit.
4. Work-Status and Restriction Notes From Your Doctor
Work-status notes, sometimes called return-to-work slips or PR-2 progress reports, are the medical documents that tell your employer what you can and cannot do while you recover. They are also the documents that legally entitle you to temporary disability (TD) benefits.
Under Cal. Lab. Code §4653, TD benefits pay two-thirds of your average pre-injury weekly wage while you are unable to work your usual job. To receive those payments, your doctor must document that you are temporarily unable to perform your full duties. A work-status note is how that gets established.
Keep every work-status note, including ones that say "no work," "modified duty only," or "return to full duty" on a specific date. The sequence of these documents tells the story of your recovery and the period during which you were entitled to TD benefits. If the insurer tries to cut off your TD payments early, your stack of restriction notes is the evidence that pushes back.
Practical takeaway: Ask for a copy of the work-status note at every appointment. If your employer says there is no modified duty available for your restrictions, notify the insurer in writing and keep that communication as well.
5. Every Medical Bill and Treatment Receipt
Under Cal. Lab. Code §4600, your employer or their workers' comp insurer is responsible for all reasonable and necessary medical treatment related to your injury. That includes doctor visits, surgery, physical therapy, prescription medications, medical equipment, and in some cases, transportation to and from treatment.
The only way to enforce that right is to have itemized bills and receipts. An insurer that denies a bill without a paper trail is easy to fight. An insurer that denies a bill you cannot document is a much harder problem.
Save every Explanation of Benefits (EOB) statement from your health insurer if treatment was initially routed through personal health coverage. Those documents show what was paid and what the insurer later needs to reimburse. Also save receipts for mileage, parking, or co-pays you paid out of pocket.
Practical takeaway: Photograph every receipt and bill the day you receive it and store them digitally. Medical billing offices sometimes lose records, and having your own copies means disputes can be resolved with evidence, not memory.
6. Pay Stubs to Document Your Wages Before the Injury
Pay stubs covering at least the four weeks before your injury are the primary document California uses to calculate your temporary disability benefit, which equals two-thirds of your average weekly wage under Cal. Lab. Code §4653.
If your pay stubs are not available, the insurer will use whatever wage information your employer provides, which can be incomplete or wrong. Workers who receive tips, overtime, shift differentials, or commissions often lose significant benefit income because those earnings are left out of the wage calculation.
Gather pay stubs from at least the four to eight weeks before your injury. If you have W-2 forms from the prior tax year, save those as well. If you were paid in cash or informally, bank deposit records, tax returns, and declarations from coworkers who witnessed your pay can substitute.
Under Cal. Lab. Code §4453, the calculation of your average weekly earnings must account for all remuneration, including the types of supplemental pay listed above. An attorney reviewing your wage calculation can identify whether the insurer set your benefit rate correctly.
Practical takeaway: If you are unsure whether your TD rate is correct, the DWC publishes annual maximum and minimum TD benefit rates. If your stated rate is below the published minimum or does not reflect your true earnings, that is worth disputing.
7. Names and Contact Info of Any Witnesses
Witness information is the only independent, third-party corroboration of how your injury happened, where it happened, and whether you were doing your job at the time.
Insurers dispute claims in two common ways: they argue the injury did not happen at work, or they argue the mechanism of injury was not as serious as described. A coworker, supervisor, or bystander who saw the incident can refute both arguments.
Collect names, job titles, phone numbers, and email addresses within the first 48 hours of the incident. After that window closes, witnesses may transfer to different shifts, leave the company, or simply forget the details. A witness who can no longer remember what they saw is far less useful than one who was interviewed close in time to the event.
You do not need a formal statement right away. A name and a contact number is enough to start. Your attorney can coordinate witness interviews in a format that is admissible if the case proceeds to a WCAB hearing.
Practical takeaway: If a supervisor or coworker tells you verbally what they saw, send them a brief text or email summarizing it and ask them to confirm. That written confirmation is a starting point for a formal statement later.
8. A Written Timeline of How the Injury Happened
Memory degrades fast, especially after a traumatic event. The version of events you can reconstruct two weeks after the incident is sharper and more reliable than the one you will recall six months later when the insurer's investigator or a WCAB judge asks.
Write down everything within 24 to 48 hours of the injury. Include:
- The exact date and time
- The location on the job site or workplace where it happened
- The task you were performing
- The sequence of events leading to the injury
- What you felt physically at the moment of impact or onset
- Who was nearby
- What you did immediately after (told a supervisor, sought first aid, left for the hospital)
This document is not filed anywhere at the start. It is your private reference. If the insurer raises a dispute about the mechanism of injury, your written account, consistent with the medical records from day one, is the document that credibly holds the story together.
Practical takeaway: Write it by hand or in a notes app immediately after the incident. Do not edit it later. A document with an original timestamp that has not been altered carries more weight than one that was revised.
9. All Letters and Notices From the Insurer or Adjuster
Every letter, notice, or form from the insurance adjuster is a legal document that can affect your right to treatment, benefits, and settlement, so save all of them in one place from day one.
Once you file your DWC-1, the insurer has 90 days to accept or deny your claim under Cal. Lab. Code §5402. During that 90-day period, treatment must be authorized up to $10,000 under the same statute. Every communication from the insurer during this window, and after it, is a legal document with real deadlines attached.
Save the following without exception:
- The initial claims administrator contact letter
- Every Utilization Review (UR) decision approving or denying treatment
- Any Independent Medical Review (IMR) notices if you appeal a UR denial
- Benefit payment notices and any notice of changes to your TD payments
- Denial letters with the stated reasons for denial
- Any correspondence offering a settlement (Compromise & Release or Stipulation with Request for Award)
Denial letters in particular carry deadlines for appeal. Missing an appeal window can permanently close off a benefit. An attorney reviewing your file needs these documents to know what options are still open.
Practical takeaway: Create a dedicated physical folder or a clearly labeled email folder the day your case opens. Every insurer communication goes in it, in order, the day it arrives.
Why the Document Checklist Matters Before You Sign Anything
Insurance adjusters are not working for you. Their job is to close your claim for as little as possible, as quickly as possible. The documents above are the tools that counterbalance that pressure.
In California, an injured worker must file a completed DWC-1 claim form with their employer within one year of the injury date under Cal. Lab. Code §5405.
Workers who come to us with complete documentation consistently recover more than workers who come to us with a gap in the record. The gaps are not always the injured worker's fault, but they are always the injured worker's problem to solve.
At Nordanyan Law, we've handled over 7,500 workers' comp cases across Southern California with a 99.9% win rate. We know exactly which documents an insurance carrier will challenge and which ones close the argument. If you are unsure whether your records are complete, or if the insurer has already contacted you with a settlement offer, call us before you respond.
Call (818) 794-9947 for a free case review. No fee unless we win.
You can also start with our workers' compensation practice area overview or schedule a free case evaluation. Every injured worker deserves the same quality of legal representation as any corporation. That is the principle this firm was built on.
Frequently Asked Questions
What documents do I need for a workers' comp claim in California?
The core documents are your completed DWC-1 claim form (with the filing date noted), a written injury report to your employer, all medical records from the first visit onward, work-status and restriction notes from your treating doctor, itemized medical bills and treatment receipts, pay stubs from the four to eight weeks before the injury, witness names and contact information, a written timeline of how the injury happened, and all letters or notices from the insurance carrier or adjuster.
What is the DWC-1 form and when do I need to file it?
The DWC-1 is California's official workers' compensation claim form. Under Cal. Lab. Code §5401, your employer must provide you with the form within one working day of learning about your injury. You complete the employee section, sign it, and return it to your employer. Under Cal. Lab. Code §5405, you have one year from the date of injury to file a claim, but filing the DWC-1 promptly protects your right to interim medical treatment up to $10,000 during the insurer's 90-day investigation period.
What paperwork should I keep after a work injury?
Keep every piece of paper and every digital communication related to your injury, including: the injury report you gave your employer, the completed DWC-1, all medical records and bills, work-status notes from your doctor, pay stubs from before the injury, witness contact information, your own written account of how the injury happened, and all letters and notices from the insurer. Nothing should be thrown away until your case is fully resolved and any appeal windows have closed.
How do I prove a workers' comp injury in California?
To prove a compensable workers' comp injury in California, you need to establish that (1) you are an employee covered by the employer's workers' comp policy, (2) the injury arose out of and in the course of employment under Cal. Lab. Code §3600, and (3) the injury caused a medical condition requiring treatment or resulting in disability. Medical records establishing the diagnosis and a physician's opinion linking the condition to your work duties are the primary evidentiary tools. Witness statements, your written incident account, and employer safety records can all support the claim.
How long do I have to report a work injury to my employer in California?
You must notify your employer within 30 days of the date the injury occurred under Cal. Lab. Code §5400. For cumulative trauma injuries, such as repetitive strain or occupational disease, the 30-day clock starts when you know, or reasonably should know, that the injury is work-related. Missing the 30-day window can result in loss of benefits unless you can show a valid reason for the delay.
What happens if my workers' comp claim is denied?
If the insurer denies your claim, you have the right to dispute the decision before the WCAB. Your complete documentation, especially your medical records, incident timeline, and all insurer correspondence, is the foundation of that appeal. A denied claim is not the end of the road, but the denial letter itself contains the stated reason for denial and the deadlines for response, which is why saving every insurer communication from day one is so important.
Can my employer fire me for filing a workers' comp claim?
No. Cal. Lab. Code §132a prohibits employers from discharging, threatening, or otherwise discriminating against an employee for filing a workers' comp claim. If you experience retaliation, your written injury report and any employer communications following your filing are the key documents for a §132a petition. These cases carry separate remedies including increased compensation and reinstatement rights.