A pre-existing condition does not end your car accident claim in California. If the crash made an old injury worse, that worsening, the aggravation, is a real and recoverable part of your case, separate from whatever came before it. Insurance companies lean hard on old medical records precisely because most jurors and most claimants assume the opposite, that a prior injury cancels out a new one. It does not, and the law is specific about why.
What changes with a pre-existing condition is not whether you can recover. It is what you recover for. The claim is not about the back pain you already had. It is about the difference between how that back functioned the week before the crash and how it functions now, and proving that difference is where these cases are won or lost.
The law: aggravation of a pre-existing condition is compensable
California’s civil jury instructions include one written for exactly this situation. Jurors are told that if a person had a condition that made them more susceptible to injury, and the crash aggravated that condition, the defendant is responsible for the aggravation even though the same crash might have caused little or no harm to a perfectly healthy person. This is sometimes summarized as the rule that you take the plaintiff as you find them. A defendant does not get a discount because the person they hit already had a bad back.
This is not a technicality. It reflects something true about how injuries work in bodies, apart from anything an insurance company’s file has to say about it. A disc that has degenerated over twenty years of normal wear is more vulnerable to a sudden force than a healthy disc. The crash did not have to create damage from nothing. It only had to push a joint, disc, or nerve past the point where it had been managing on its own, into a state that requires treatment.
Why the insurance company wants ten years of records
Almost every serious injury claim includes a request for years of prior medical history, often five to ten years back or more. The stated reason is reasonable: the company needs to know your baseline in order to evaluate the claim fairly. The practical reason is that a long enough record almost always contains something the company can point to, a note about occasional back pain from 2019, an old sports injury, a mention of stiffness at a routine physical.
None of that defeats an aggravation claim by itself. What matters is not whether the old record exists. It is whether the record shows a meaningful difference between then and now. Our guide on getting your own medical records explains how to gather that history yourself rather than letting the insurance company control which records get pulled and in what order they get read.
The before-and-after comparison that decides these cases
Every aggravation claim comes down to a comparison, and the strength of the comparison depends on how well both sides of it are documented.
- Before the crash: What were you doing day to day? Working full duty, running, lifting your kids, sleeping through the night, sitting through a full workday without pain. A prior note that says “occasional low back stiffness” is very different from a chart showing months of active treatment, injections, or missed work.
- After the crash: What changed, specifically? Not just “more pain,” but a functional difference: you cannot lift what you used to lift, you cannot sit at your desk through a full shift at a job in Porter Ranch or anywhere else, you are back in physical therapy after years without it, an MRI shows a new disc herniation at a level that was previously only mildly degenerated.
The comparison works in your favor when the gap between before and after is documented by more than your own memory. Old records, a prior employer’s attendance history, or your own description to a treating doctor early in the case all help draw that line while it is still fresh.
A useful habit, if you have not started treatment yet, is to write down your own before-and-after account while it is easy to remember, then hand that account to your doctor at the first visit rather than trying to reconstruct it months later. Memory of ordinary daily function fades faster than memory of the crash itself. A person can describe the collision in detail a year later and still struggle to recall exactly how far they could walk, or how long they could sit, in the weeks before it happened.
Degenerative findings are common and do not disqualify a claim
Here is something most people do not know until an insurance company’s letter tells them, usually in a way meant to discourage them. Imaging on most adults past 40 shows some degree of disc degeneration, arthritis, or old wear, whether or not that person has ever had a symptom. Studies of people with no back pain at all routinely find these changes on MRI. A radiology report from an imaging center near Northridge Hospital, or anywhere else, that says “degenerative changes” or “pre-existing degeneration” is describing something close to normal for your age rather than proof that the crash caused no harm.
Insurance companies know this, and they cite a degenerative finding in their letters anyway, because most people receiving the letter do not know how common these findings are. Citing the finding does not settle the question. The question is not whether degeneration exists on the image. It is whether you were managing that degeneration without significant symptoms before the crash and are not managing it now. A treating doctor’s opinion on that point, based on your reported history and your exam, carries far more weight than a radiologist’s description of the scan alone.
How to talk to your doctor so the record shows the change
The medical record is built one visit at a time, and what you say in those visits matters as much as the treatment itself.
- Tell the doctor plainly what is different now compared to before the crash, using specifics rather than general complaints. “I could run three miles before this, now I cannot walk to the mailbox without pain” is a sentence a claims file can use. “My back hurts” is not.
- Mention any prior treatment you had for the same area, and when it ended. If you had physical therapy for your back four years ago and had not needed it since, say so. Hiding an old injury from your own doctor only weakens your case when the insurance company finds the record anyway.
- Describe function, not just pain: what you can no longer do at work, at home, or with your family, and since when.
- Follow through on referrals and imaging your doctor recommends. A gap in treatment after a doctor’s own referral is one of the easiest things for an insurance company to use against an aggravation claim. Our article on why waiting to see a doctor hurts a claim explains the same principle in more detail.
- Answer a doctor’s questions about your history completely and consistently every time you are asked. Inconsistency between what you told one provider and another is a far bigger problem than the prior injury itself.
The honest limits of an aggravation claim
This is the part an honest guide has to include, because it affects what you should expect. You recover for the aggravation, the worsening the crash caused, not for the underlying condition that was already there before anyone hit you. If your back required surgery that was already scheduled before the crash, the crash did not create that need, and a claim built as though it did will not hold up.
The line is not always obvious, and that is exactly why it gets fought over. A person with mild, occasional back pain who ends up needing injections and months of therapy after a crash has a strong aggravation claim. A person who was already in active treatment for a herniated disc, already scheduled for a procedure, and whose symptoms after the crash look the same as before, has a much harder case to build. Most real situations sit somewhere between those two examples, which is why the medical record, built carefully from the first visit forward, decides the claim rather than either side’s opening description of it.
A traumatic brain injury raises a related but distinct version of this issue, since a prior concussion or a pre-existing cognitive condition can complicate how a new brain injury is diagnosed and documented. Our page on brain injury claims covers that situation separately, since the medical proof involved is different from an orthopedic aggravation claim.
Key points
- California law allows recovery for the aggravation of a pre-existing condition, even when the underlying condition was already there.
- The claim rests on the documented difference between your condition before the crash and after it.
- Degenerative findings on imaging are common in adults over 40 and do not by themselves disqualify a claim.
- The insurance company’s request for years of records is standard, and an honest, consistent account of your history strengthens the claim more than it weakens it.
- Describe specific functional changes to your doctor at every visit rather than general pain complaints.
- You recover for the worsening the crash caused rather than for whatever condition existed before the crash.
Frequently asked questions
Will the insurance company find out about my old injury even if I do not mention it?
Usually, yes. Insurance companies routinely request years of records once a claim involves significant treatment, and an old injury that shows up after you denied having one damages your credibility far more than the injury itself would have. Disclose it early and let your doctor document how it differs from your current symptoms.
Does a prior car accident automatically hurt my current claim?
Not automatically. What matters is whether the prior injury had resolved, and whether your current symptoms and imaging findings are different from what existed before. A fully resolved injury from years earlier is treated differently than an injury you were still actively treating when the new crash happened.
What if my doctor says the crash only aggravated an existing problem?
That is still a compensable claim. Aggravation of a pre-existing condition is its own recognized category of damages in California, described in the jury instructions given in these cases, and it does not require the crash to have caused an entirely new injury.
Should I get a second medical opinion if the insurance company disputes my aggravation claim?
It can help, particularly if your treating doctor is not clearly documenting the before-and-after comparison. A clear, specific opinion connecting your current limitations to the crash, written by a doctor who examined you and reviewed your prior history, is often the single most important document in a disputed aggravation case.
If you had a prior injury and a crash made it worse, do not assume the old history closes the door on your claim. Call Manoukian Law Firm at (818) 818-5031 or reach us through our car accident page for a free consultation. The firm helps clients in English, Spanish and Armenian. Consultations are free and there is no fee unless we win.
