The phone call from the insurance adjuster sounds reasonable. They have your medical records now. They have noticed a 2019 visit for back pain, a chiropractor appointment after you moved apartments, a note about migraines from years ago. And they have a number they would like you to consider — a number that is much lower than what your case is worth — because, they explain, your injuries “were already there.”
This is one of the most common, and most effective, tactics used against injured people in New Mexico. It is also, in most cases, legally wrong.
New Mexico follows what lawyers call the eggshell plaintiff rule. Under that rule, a person who causes a crash is responsible for the harm they actually caused — even if the person they hit was more fragile, more vulnerable, or already dealing with a prior condition that the crash made worse. The carrier may not love the rule, but it is the law, and it is taught to every jury that hears one of these cases.
This guide explains how the eggshell plaintiff rule actually works in New Mexico, what counts as aggravation of a pre-existing condition, how insurance companies try to twist your medical history, and what you can do to protect yourself before they shrink a real injury into a “pre-existing” excuse.
If an adjuster has already told you that your claim is worth less because of your prior medical history, do not sign anything. Read this, then call.
The Eggshell Plaintiff Rule, in Plain English
The rule has an odd name and a simple idea: a wrongdoer takes the victim as they find them.
If a careless driver runs a red light and rear-ends a healthy 25-year-old, they are responsible for that 25-year-old’s injuries. If that same careless driver runs the same red light and rear-ends a 70-year-old with osteoporosis, a prior disc herniation, and a fragile neck — and the crash sends that person into surgery — the driver is responsible for those injuries, too. The fact that the victim was more vulnerable does not reduce the wrongdoer’s liability.
New Mexico has adopted this rule through long-standing case law and through the pattern jury instruction given in personal injury cases. The instruction tells the jury, in substance, that if a defendant’s negligence aggravates a pre-existing condition, the defendant is liable for the aggravation — even if a healthy person would not have been hurt as badly under the same impact.
That single principle does an enormous amount of work in a real case.
How New Mexico’s pure comparative negligence rule affects what you can recover after a crash.
What “Pre-Existing Condition” Actually Means
Insurance companies use the phrase as if it were a magic disqualifier. It is not. A pre-existing condition is simply a medical condition that existed before the crash. That includes things like:
- Prior back, neck, or shoulder injuries
- Degenerative disc disease (which most adults have to some degree by middle age)
- Arthritis
- Previous concussions or head injuries
- Chronic migraines or headaches
- Anxiety, depression, or PTSD
- Prior surgeries on the same body part
- Old sports injuries
Having any of the above on your medical chart does not mean you have no case. What matters legally is whether the crash made the condition worse — caused new pain, new symptoms, new limitations, new treatment, or new diagnoses on top of whatever baseline existed before.
Aggravation: Where Most Real Cases Live
Most serious New Mexico injury cases involve some degree of aggravation. People are not blank medical slates. They have lived in their bodies for decades. The legal question is not “was this person perfect before?” — it is “what did this crash do to them?”
Aggravation can look like:
- A previously stable disc that herniates after the crash
- A previously manageable back condition that now requires surgery
- A dormant prior concussion symptom set that flares back into daily life
- A baseline anxiety that becomes full-blown PTSD with driving phobia
- A previously controlled chronic pain condition that becomes uncontrollable
In each of those scenarios, the defendant is responsible for the difference — the gap between where you were before the crash and where you are after. That gap is your case.
How Insurance Companies Try to Erase the Aggravation
The carrier has a financial incentive to argue that everything you are feeling now is just the prior condition. To make that argument stick, adjusters and defense lawyers use a predictable set of moves.
The Blanket Medical Authorization
They will ask you to sign a form releasing your entire medical history, often going back ten years or more. Then they will comb through every chart entry looking for anything that resembles your current complaint. Never sign a blanket medical authorization. Records relevant to a crash claim should be narrow, dated, and tied to the body parts at issue. See how insurance companies build their case against you — and how to stop it.
The “You Already Had That” Argument
Once they find a prior complaint, they will frame your current injury as “the same thing.” A 2019 chiropractor visit for a stiff neck becomes proof that your cervical disc herniation in 2026 was inevitable. A teenage concussion becomes proof that your current post-concussive symptoms are unrelated. The argument is rarely supported by the medical science, but it is cheap to make and effective if no one pushes back.
The Gap-in-Treatment Spin
If you had pain years ago but no treatment in the last several years before the crash, that gap is powerful evidence that your condition was stable — not flaring, not getting worse, not requiring care. Carriers will sometimes ignore the gap and treat the old entry as ongoing. Treating physicians, properly questioned, can usually establish what your real baseline was.
The “Soft Tissue” Dismissal
Adjusters love the phrase “soft tissue.” It sounds minor. But disc injuries, ligament injuries, and traumatic brain injuries all start as “soft tissue” complaints in the emergency room before imaging and specialist evaluation catch up. Letting a carrier label your case “soft tissue” early can anchor an unfairly low valuation.
What Evidence Proves Aggravation
The good news: aggravation cases are won every day in New Mexico, and the evidence pattern is well understood.
Comparative imaging. If you have an MRI from before the crash and an MRI after, side-by-side comparison can show new findings — a new herniation, new nerve impingement, new fluid, new disc desiccation in segments that were previously clean.
Treating physician testimony. A doctor who knew you before and after the crash, or who reviews your prior records carefully, can opine that the crash caused new injury or worsened existing pathology. In New Mexico, treating physicians are often the most credible voices in an injury case.
Functional change. Before-and-after evidence about what you could do — work, walk, lift, sleep, drive, parent — is some of the most persuasive proof of aggravation. Witnesses who knew you before the crash matter here.
Symptom pattern. New symptoms (radiating pain down a new limb, new headaches, new cognitive issues) that did not appear in prior records strongly suggest a new injury rather than a continuation of an old one.
Diagnostic gap. Old records that show complaint without imaging, surgery, or ongoing treatment can establish that your baseline condition was clinically minor — even if the chart mentions the same body part.
What You Should Do to Protect an Aggravation Claim
Before you talk to any adjuster, before you sign anything, do these things.
Tell every treating provider about the crash. Every doctor, physical therapist, and specialist should have a clear chart note that your current symptoms began or worsened after the crash. “Patient was in a motor vehicle collision on [date] and has had new/worsened [symptom] since” is one of the most valuable sentences in your file.
Be honest about your prior history. Hiding a prior injury is the single worst thing you can do in an aggravation case. It will come out. When it does, your credibility is gone — and credibility is currency in any injury claim. The eggshell plaintiff rule does not require you to be uninjured. It just requires you to be truthful.
Keep a contemporaneous symptom journal. Short daily notes — what hurts, how badly, what you could not do — build a record that doctors and juries trust later. Memory fades. Notes do not.
Stay consistent with treatment. Gaps in treatment after a crash are used against injured people. If a provider recommends physical therapy twice a week, go twice a week. If you cannot, document why.
Get an attorney involved before the records request goes out. Most aggravation cases are lost in the medical authorization stage, before anyone has filed a thing. The fix is narrow, well-drafted records requests — not a blanket release.
The New Mexico Statute of Limitations Still Applies
Pre-existing conditions do not stop the clock. In New Mexico, the general statute of limitations for personal injury is three years from the date of injury under NMSA § 37-1-8. Wrongful death is generally three years from the date of death. There are exceptions, shorter deadlines for certain defendants (including governmental entities under the New Mexico Tort Claims Act), and tolling rules for minors and incapacity — but the baseline is three years.
If you have already been dealing with an adjuster for a year, you still likely have time. But that time is shrinking, and the longer you wait, the harder some of the evidence above becomes to gather.
Frequently Asked Questions
Can I bring a personal injury claim in New Mexico if I had a prior injury to the same body part?
Yes. Under New Mexico’s eggshell plaintiff rule, a defendant is responsible for aggravating a pre-existing condition. You must show that the crash worsened the condition or caused new symptoms, but a prior injury does not bar your claim.
Does the insurance company have a right to my entire medical history?
No. They are entitled to records relevant to the injuries you are claiming. A blanket medical authorization is not legally required and should not be signed without an attorney’s review.
What if my pre-existing condition was undiagnosed before the crash?
Many people have asymptomatic conditions — disc degeneration, narrowed spinal canals, prior subclinical injuries — that show up on imaging only after a crash forces them to seek care. The eggshell plaintiff rule still applies. A defendant takes the plaintiff as they are, including conditions no one knew about.
Will a jury reduce my recovery because of my prior condition?
A New Mexico jury is instructed to award damages for the harm caused by the crash, including the aggravation of any pre-existing condition. They are not asked to discount your recovery because you were less than perfectly healthy before.
How long do I have to file a New Mexico injury claim?
Generally three years from the date of injury for personal injury cases under NMSA § 37-1-8, with important exceptions for claims against governmental defendants and certain other situations. Do not rely on the three-year rule without confirming the deadline for your specific facts.
Talk to Alex Flores Before You Talk to the Adjuster
Pre-existing condition cases are won and lost in the early weeks. The records request, the first recorded statement, the first treatment decisions — all of it sets the frame for the rest of your case. Once the carrier has built its “you already had that” narrative, undoing it is harder than preventing it in the first place.
Alex Flores is a personal injury attorney with Singleton Schreiber, handling serious injury and wrongful death cases throughout New Mexico. Consultations are free, confidential, and carry no obligation. If you were hurt in a crash and you are worried that a prior injury might be used against you, that is the conversation to have today — not the one with the adjuster.
Call Alex Flores at Singleton Schreiber: 505-587-3473. We handle the medical authorizations, the records, the experts, and the carrier — so you can focus on getting better.
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Disclaimer: This post provides general information and does not constitute legal advice. No attorney-client relationship is formed by this post. Past results do not guarantee future outcomes.