Pre-Existing Injuries and Accident Claims: What the Rule Actually Protects

Many people mistakenly think that an old injury or medical situation automatically keeps them from recovering compensation after a car accident. Because of that, they give up on claims or accept settlements that do not match the damage they suffered.

If having a pre-existing condition by itself disqualifies someone from pursuing compensation, then there would be no legal way forward for countless accident victims whose pain a crash worsened.

The law understands that a car accident can worsen an existing condition, and the responsible driver may still be held accountable for the extra harm caused.

Take Your Victim As You Find Them

The governing principle is the eggshell skull rule: a negligent party is responsible for the full harm they cause, even when a victim’s pre-existing conditions make that harm worse. It applies to both psychological and physical conditions, including degenerative disc disease, herniated discs, arthritis, prior whiplash or soft-tissue injuries, healed fractures near the impact area, and conditions like anxiety or PTSD. 

If a collision reactivates an existing anxiety disorder, worsens a stable disc condition, or makes surgery necessary, the at-fault party may be liable for that added harm. 

The plaintiff must still show the defendant’s negligence caused a measurable aggravation, typically through medical records and expert opinions distinguishing accident-related harm from the condition’s natural progression. The rule doesn’t pay for the condition someone already had; it pays for what changed. 

Many states have jury instructions to this effect, though the wording varies by jurisdiction.

The Fight Is Over Apportionment, Not the Rule

Almost no one disputes the eggshell principle. The dispute centers on how much the current condition is aggravated and how much the disease is simply following its natural course.

That is the aspect of the eggshell principle where jurisdictions diverge, and it is worth knowing what your state follows. Jurisdictions differ on who bears the burden of distinguishing a pre-existing condition from accident-related aggravation, particularly when the injuries cannot be clearly separated.

What an Insurer Does With a Medical History

Carriers understand the rule perfectly well, and they also understand that most claimants do not.

Insurers may request medical records covering many years before the accident in an effort to evaluate whether the claimed injuries predated the collision. These insurers also look for any prior treatment that can be recast as the real cause. The following are some of the commonly used tactics employed by insurance companies:

• An Independent Medical Examination (IME) arranged by the insurer is performed by a physician who has not previously treated the claimant and typically bases opinions on a single examination and a review of medical records.
• Reframing the change as natural progression. The argument is not that the claimant is lying, but that the deterioration was already occurring and the crash merely coincided with it.
• Broad medical authorizations may allow insurers to obtain records unrelated to the accident to evaluate other potential causes of the claimed injuries.

The scrutiny multiplies when several carriers are on the hook at once. A rideshare collision is the clearest example. In a rideshare accident, the driver’s personal policy, the platform’s coverage, and a third driver’s insurer can all be in the file. 

Each insurer may attempt to minimize its financial responsibility by disputing liability, causation, or the extent of the claimed injuries. In these kinds of cases, liability determination is critical.

According to a Baton Rouge rideshare accident lawyer, evidence such as police reports, witness statements, and crash reconstruction can help establish liability in accidents involving multiple parties.

The Baseline Problem

In every one of these cases, you can compare the person’s previous condition to their current one. The before is whatever the records already say. A condition that was stable, lightly treated, and not restricting daily life reads very differently from one that was visibly deteriorating.

The aftermath is what is built or lost in the days immediately following the collision. Same-day treatment, follow-up when new symptoms appear, and a consistent record are what make the comparison legible later. 

Authorizations Have a Scope, and It Is Negotiable

When a carrier sends a medical authorization, the scope of it is not fixed by nature. A medical release that gives access to all providers and records from a person’s entire lifetime may be too broad. Depending on the circumstances, the scope of a medical authorization may be negotiated to limit disclosure to records reasonably related to the injuries at issue.

Medical authorizations are often revocable prospectively, although records already disclosed generally cannot be retrieved. 

Once litigation begins, discovery rules and court orders may require additional disclosure of relevant medical records.

The Gap Is Evidentiary, Not Legal

Most claimants assume that a prior injury weakens their case. Insurers win these arguments because claimants cannot make before-and-after comparisons from records not considered at early days after the accident. Most people do not know that the exam is adversarial or that the authorization was negotiable. 

These issues often stem from a documentation problem, which a meticulous record created immediately after the incident could address.