How Preexisting Condition Injury Claims Work
Preexisting condition injury claims let a person recover for the harm an accident caused by making an existing condition worse, though generally not for the condition itself. California’s civil jury instructions say this directly. A person with an old back injury who is rear ended may still claim the added pain, treatment and limits that follow. So the key question becomes how much worse things got and how to prove the change.
What the Jury Instructions Say
The Judicial Council publishes the standard civil jury instructions, known as CACI, on the California Courts site. CACI 3927 covers aggravation of a preexisting condition. In general terms, it tells jurors not to award damages for the condition itself, yet to award damages for any harm the defendant’s conduct caused by making it worse.
CACI 3928 addresses a related idea. It tells jurors that a person who was unusually susceptible to injury may recover for all harm the defendant caused, even if a healthier person would have suffered less. Lawyers often call this the eggshell plaintiff rule. Together, these instructions keep a prior condition from barring a claim.
Why Insurers Focus on Prior Records
Insurers often request years of medical records. Then they look for earlier complaints about the same body part, because those records can support an argument that the pain came before the crash. That argument is common in neck, back and knee claims.
Prior records are not always bad for the injured person, though. Records showing a stable condition before the accident can make the change afterward easier to see. For example, a chart showing no treatment for two years, followed by weekly therapy after a crash, tells a clear story.
Proving the Change in Preexisting Condition Injury Claims
Proof usually comes from comparing before and after. Imaging can help when an old scan exists, because a doctor can compare it with a new one. Also, notes about range of motion, pain levels and medication changes can show a shift.
Doctor opinions matter most. A treating physician who knows the history can explain which symptoms are new and which got worse. So ask your providers to note your prior condition and how the accident changed it.
Daily Life Before and After
Medical records rarely capture everything. A person who used to hike every weekend with a manageable back problem, and now cannot walk a mile, has lost something real. Therefore, notes from family, friends and coworkers can fill gaps that charts leave.
Keep a journal that compares activities before and after the accident. Write down specific tasks, such as lifting groceries, sleeping through the night or sitting at a desk. Concrete examples carry more weight than general statements. For more on tracking limits, see injury lost wages evidence.
Be Honest About Your History
Disclose prior injuries to your doctors and, through a lawyer, to the insurer when asked. Hiding a past condition usually backfires, because records tend to surface during the claim. Then the hidden history can damage credibility on every other point.
Being upfront also helps the doctor give a stronger opinion. A physician who knows the full history can separate old and new problems with more confidence.
Common Conditions That Get Worse
- Degenerative disc disease in the neck or back
- Arthritis in the knees, hips or shoulders
- Earlier fractures or surgeries
- Prior concussions
- Anxiety or depression
Degenerative findings on imaging are common in adults, even without symptoms. Insurers sometimes point to them anyway. Still, the question is whether the accident caused new symptoms or worsened old ones, which a doctor can address.
How Value Is Assessed
Value in preexisting condition injury claims depends on the size of the change. A brief flare that resolves in weeks differs from a permanent loss of function. Also, a prior condition may affect future care, since the doctor may predict faster wear on an injured joint.
Fault rules still apply. California divides fault by percentage, which the site covers in California comparative negligence.
Timing in Preexisting Condition Injury Claims
Settling too early is a common risk. An aggravated condition may take months to stabilize, and only then can a doctor say whether the change is permanent. So many people wait until treatment reaches a plateau before discussing a settlement. That pause has to fit within the filing deadline, which the site explains in California injury filing deadline.
Also consider gaps in care. A long break in treatment after the accident can lead an insurer to argue the flare ended. If you stop treatment for a reason, such as cost or a move, write the reason down.
Records to Gather
Collect records from before the accident as well as after. Include primary care notes, imaging reports, therapy records and pharmacy histories.
Then keep them in date order. That simple step helps a doctor, a lawyer or a jury see the change quickly. Finally, keep a list of every provider you saw in the five years before the accident, because the insurer will likely ask for it.
This article is general information, not legal advice. Laws change and every situation is different.