Pre-existing conditions do not automatically destroy a car accident claim, but they can make causation, aggravation, and medical proof more important during settlement negotiations.
How Pre-Existing Conditions Are Evaluated
- The key issue is whether the crash worsened the condition
- Prior records may be compared with post-crash symptoms
- Consistent treatment helps separate aggravation from unrelated pain
- Objective findings and physician opinions can strengthen causation
- Insurers often use prior conditions to discount settlement value
The Eggshell Plaintiff Rule
Under the eggshell plaintiff rule recognized in most states, a defendant is responsible for the full extent of harm caused to the injured person, even if a pre-existing condition made the person more vulnerable than a healthy person would have been. This means an insurer cannot escape liability simply because you had a prior back injury, degenerative disc disease, arthritis, or previous accident history. What matters is whether the crash worsened your condition beyond its pre-accident baseline.
How Insurers Use Pre-Existing Conditions Against You
Insurers routinely request complete medical records going back five to ten years. Their goal is to find documentation that your current symptoms existed before the crash. Common arguments include: (1) the imaging shows pre-existing degenerative changes, not acute injury; (2) you treated for the same area before the crash; or (3) the injury claim is an aggravation of a minor pre-existing issue, not a new injury. Each of these arguments can reduce settlement value if unchallenged.
What Documentation Helps Prove Aggravation
- Pre-accident medical records showing your baseline function and symptom level
- Post-accident records documenting new symptoms or a clear change in condition
- Physician opinion letters that explicitly compare pre- and post-accident status
- Functional capacity evaluations or activity-limitation notes tied to the crash
- Employer records showing no prior work restrictions before the accident
Typical Settlement Impact
Cases with pre-existing conditions at the same injury site may see a reduction in pain-and-suffering multipliers by 20–40% depending on how well the aggravation is documented. A case with clear imaging change post-accident and an explicit physician causation opinion can largely preserve value. A case with overlapping prior records and no physician distinction between old and new symptoms may face a larger reduction. The key variable is medical proof, not the existence of the prior condition itself.
How To Use This Guide
Use this guide as a settlement planning framework, not as a guaranteed value. The practical result still depends on liability evidence, medical records, insurance coverage, state law, deadlines, and the way the insurer evaluates the file.
What To Compare Before Accepting An Offer
Compare the offer against medical bills, future treatment, lost income, pain and suffering, liens, fees, and policy limits. A number can look reasonable until the net recovery, unpaid balances, or future care needs are separated from the gross settlement.
Related Guides
- Settlement With MRI Findings
- Evidence That Increases Settlement
- Insurance Denies Liability
- Settlement Calculator
This article is general information, not legal or tax advice. Settlement value and legal treatment depend on case-specific facts and current rules.