Getting hurt at work is stressful enough without the added blow of a denied claim. Unfortunately, insurance companies deny California workers’ compensation claims every day — and they count on injured workers not knowing how to fight back. As a board-certified specialist in workers’ compensation law, attorney Eman Yazdchi sees these denials regularly and knows exactly how to challenge them.
Here are the five most common reasons claims are denied in California — and what you can do about each one.
1. Late Reporting of the Injury
Under California Labor Code section 5400, you generally have 30 daysto report a work injury to your employer. If you miss this deadline, the insurance company has an easy basis to deny your claim. Many injured workers don’t report right away because they think the injury will heal on its own, they fear retaliation from their employer, or they don’t realize the injury is work-related (common with repetitive stress injuries that develop gradually).
How to Fight This Denial
Even if you reported late, your claim may still be viable. California law recognizes exceptions for injuries that develop over time (cumulative trauma). Additionally, the “discovery rule” starts the reporting clock from the date you knew or should have known the injury was work-related — not necessarily the date it first occurred. A workers’ comp denial attorney can review the timeline and identify whether an exception applies to your case.
2. Disputed Causation
This is the most common basis for denial. The insurance company argues that your injury was not caused by your job. They may claim the injury happened outside of work, that it’s a pre-existing condition unrelated to your employment, or that there is insufficient evidence connecting the injury to a work activity.
Causation disputes are especially common with back injuries, carpal tunnel syndrome, and mental health claims, where the connection between work and injury may not be immediately obvious.
How to Fight This Denial
Causation is ultimately a medical question decided by physicians — specifically, Qualified Medical Evaluators (QMEs) or Agreed Medical Evaluators (AMEs). If the insurance company’s chosen physician says your injury is not work-related, you have the right to challenge that opinion through the QME process. A board-certified specialist knows how to select favorable QME panels, prepare you for the examination, and challenge biased medical opinions in cross-examination at the WCAB.
3. Insufficient Medical Evidence
Sometimes a claim is denied not because the insurance company actively disputes your injury, but because there is simply not enough medical documentation to support it. This happens when injured workers delay seeking medical treatment, fail to describe their symptoms consistently, or see physicians who do not document the connection between the injury and work.
How to Fight This Denial
The fix is to build a stronger medical record. This means getting treatment from a physician who understands workers’ compensation (ideally within the MPN or through a QME), ensuring your medical history accurately reflects how the injury occurred, and supplementing the record with diagnostic imaging (MRI, X-ray, CT scan) and specialist evaluations.
An experienced attorney will coordinate with your treating physician to ensure the medical reports contain the specific language and findings that satisfy the legal standard for causation under Labor Code section 3600 and the relevant case law.
4. Pre-Existing Condition Defense
Insurance companies love the “pre-existing condition” defense. If you had any prior injury or medical condition in the same body part, the insurer will argue that your current symptoms are caused by the old condition, not your recent work. This is called apportionment and it can significantly reduce your permanent disability benefits.
However, California law is clear: an employer takes the employee as they find them. If your work aggravated, accelerated, or “lit up” a pre-existing condition, that aggravation is compensable. You don’t have to prove that work was the sole cause — only that it was a contributing cause.
How to Fight This Denial
The key is the medical evidence. Under Labor Code sections 4663 and 4664, apportionment must be based on substantial medical evidence — not speculation. A certified specialist will analyze the QME’s apportionment findings, challenge any apportionment that is not supported by the medical record, and advocate for the highest compensable percentage of your disability.
5. Employer Disputes the Claim
In some cases, the employer tells the insurance company that the injury did not happen at work, that the employee was not performing work duties at the time, or that the employee’s account is not credible. This is common when there are no witnesses, when the injury was not immediately apparent, or when the employer-employee relationship has deteriorated.
If you were fired after filing your claim, the employer’s motive to dispute the injury may be even stronger. This is a form of retaliation that California law expressly prohibits.
How to Fight This Denial
Your testimony is evidence. Under California workers’ comp law, your own account of how the injury happened is admissible and can be sufficient to establish the claim if it is credible and consistent. Your attorney can also subpoena workplace records, security footage, witness statements, and other evidence to corroborate your account.
When Should You Hire a Workers’ Comp Attorney?
You should consider hiring an attorney immediately if:
- Your claim has been denied for any reason
- The insurance company is delaying your benefits
- You need surgery or have a serious permanent injury
- Your employer is retaliating against you
- You are being offered a settlement and are not sure if it is fair
- The insurer is disputing the extent of your disability
In California, workers’ comp attorneys work on a contingency fee basis— you pay nothing unless your attorney recovers benefits for you. Attorney fees in workers’ comp cases are set by the WCAB and are typically 15% of your award, so there is no financial risk to getting legal representation.
If your claim has been denied, learn more about the appeals process or contact Yazdchi Law P.C. for a free consultation. A board-certified specialist can evaluate your denial letter, identify the strongest grounds for appeal, and fight for the benefits you deserve.