If you were injured in an accident but already had a prior injury, chronic condition, or old medical issue involving the same part of your body, you may be worried that your history will be used against you. Insurance companies often try to do exactly that. But California law provides important protections for injured people with pre-existing conditions, and understanding those protections can prevent an insurer from using your medical history to deny or dramatically reduce your claim.
The Short Answer
Yes, a pre-existing condition can affect your claim — but it does not disqualify you from recovering compensation. What matters is whether the accident aggravated, accelerated, or worsened your condition. If it did, you are entitled to be compensated for that worsening, even if you were not in perfect health before the accident occurred.
What Is the Eggshell Plaintiff Rule?
California recognizes a legal principle commonly known as the eggshell plaintiff rule. The rule holds that a defendant must take the victim as they find them. In other words, if your pre-existing condition made you more vulnerable to injury than the average person, the at-fault party cannot use that vulnerability as a shield against liability.
For example, if you had a prior back injury and a rear-end collision caused a herniated disc that would not have occurred in a healthier spine, the at-fault driver is still responsible for the harm caused. They cannot argue that your outcome would have been different for someone without your history and use that as grounds to reduce what they owe.
How Insurance Companies Use Pre-Existing Conditions Against You
Despite the legal protections available to injured people, insurance companies routinely attempt to attribute injuries to pre-existing conditions rather than the accident. Adjusters may request access to years of your prior medical records looking for anything they can use to argue that your current symptoms are not new or are unrelated to the accident.
They may claim that your treatment is excessive given your pre-existing state, that you were already experiencing the pain or limitations you are now reporting, or that the accident caused no meaningful change in your condition. These arguments are designed to reduce the payout, and they can be effective against claimants who are not prepared to counter them.
How an Attorney Responds
The key to protecting a claim that involves a pre-existing condition is thorough and precise medical documentation. Pilavjian Law works closely with treating physicians and, when necessary, independent medical experts to clearly distinguish between the baseline condition before the accident and the new or worsened harm caused by it.
Medical records from before and after the accident are compared to demonstrate the change. Physicians can provide opinions on causation — explaining in clinical terms how the accident aggravated or accelerated a condition that was previously stable or manageable. This documentation forms the foundation of a claim that an insurer cannot easily dismiss.
It is also important to be honest and consistent throughout the process. Attempting to conceal a prior condition almost always backfires, as insurers conduct thorough records searches. Transparency, paired with strong medical evidence that clearly defines what the accident caused, is the most effective approach.
What You Can Recover
If your pre-existing condition was worsened by the accident, you are entitled to compensation for the difference — the harm caused by the accident itself, not the underlying condition that predated it. This includes medical treatment related to the aggravation, lost wages, pain and suffering, and any long-term impact on your ability to function or work.
If you have a pre-existing condition and are unsure how it affects your claim, Pilavjian Law can help you understand your options. Call (818) 380-3021 to schedule a free, no-obligation consultation.