If you have filed a car accident claim and the insurance company has requested your medical records, you are probably wondering what they are actually doing with them. The short answer is yes, they can send your records to a third-party reviewer under certain circumstances, and they do it routinely. The longer answer is that the circumstances matter enormously, and understanding them is the difference between cooperating appropriately with a legitimate request and handing over information that ends up being used against you in ways you never anticipated.

Start with the authorization form. When you file a claim with an insurance company, whether your own or the other driver’s, you will almost certainly be asked to sign a medical authorization. That document, sometimes called a HIPAA authorization or a medical records release, gives the insurance company permission to request your records directly from your healthcare providers. Signing it feels routine, and in some cases it is. But the scope of what you sign matters in ways that most claimants never think to examine.

A broad authorization, the kind that gives the insurer permission to collect any medical record from any provider for any time period, is not something you are legally required to sign. You may need to provide records relevant to the injuries you are claiming, but relevant is the operative word. An insurance company asking for ten years of records from every doctor you have ever seen is not asking for relevant records. They are fishing for pre-existing conditions, prior injuries, prior complaints, anything they can use to argue that what ails you today was not caused by the accident. If you sign an unlimited authorization without reading it, that fishing expedition becomes entirely legal because you gave them permission.

Once the insurance company has your records, either through your authorization or through their own legal process, third-party review is a standard industry practice. The insurer sends your records to what is called an Independent Medical Review organization or an Independent Medical Examiner, and someone who has never met you, never examined you, and has a financial relationship with the insurance company reviews your file and issues an opinion about your treatment, your diagnosis, or your prognosis. The word independent in that phrase carries more marketing value than legal precision. These reviewers are paid by the insurance company. They are selected by the insurance company. And studies of their output consistently show that they disagree with treating physicians at rates that would be statistically improbable if they were genuinely neutral.

Here is what most people in your situation do not know: the opinion of a third-party reviewer carries no inherent legal weight. It is one medical opinion, formed without a physical examination, by someone with an obvious financial incentive to find in favor of the party writing their checks. Your treating physician, the person who actually examined you, reviewed your imaging, monitored your recovery, and documented your symptoms over time, has an opinion that is built on a foundation that a paper reviewer simply cannot match. The reason insurance companies use third-party reviewers is not because those reviewers produce more accurate assessments. It is because the denial or reduction of a claim based on a reviewer’s opinion sounds more defensible than a denial based on nothing at all.

In a first-party claim context, meaning a claim against your own insurance policy such as an uninsured motorist claim or a medical payments claim, your insurer’s right to review your records is tied to the policy contract you signed. Most policies require you to cooperate with the insurer’s investigation, which includes providing access to relevant medical records. What the policy cannot do is require you to submit to an unlimited review of your entire medical history or to accept a third-party reviewer’s opinion as determinative of what you are owed. If your insurer denies your claim based on a reviewer who contradicts your treating doctor, that denial is a legal position you can contest, not a medical verdict you have to accept.

In a third-party claim context, meaning a claim against the other driver’s insurance, the dynamic is different because you have no contractual relationship with that insurer at all. They do not have a right to your medical records simply because they want them. They can request records, and you may choose to provide them as part of building your claim, but you are under no obligation to sign a blanket authorization or to cooperate with a records request the way you would with your own insurer. Any records you provide to the other driver’s insurance company should be records you have reviewed, that are limited to the injuries at issue, and that you have made a deliberate decision to share.

The most consequential thing that happens when insurance companies send records to third-party reviewers is what those reviewers do with your prior medical history. Say you saw a chiropractor three years ago for occasional lower back discomfort. You got a few adjustments, felt better, and moved on. Now you have been rear-ended and your lumbar spine is genuinely injured. A third-party reviewer with access to those prior records will frequently characterize your current injury as a flare-up of a pre-existing condition rather than a new traumatic injury. That characterization, regardless of whether it is clinically accurate, gives the insurer a basis to reduce or deny your claim. This is not a hypothetical. It is a documented pattern of conduct that plaintiff’s attorneys deal with in virtually every soft tissue injury case.

Missouri follows what is called the aggravation of pre-existing condition doctrine, which holds that a defendant is responsible for the full extent of harm caused to a plaintiff even if a pre-existing condition made that plaintiff more susceptible to injury. If you had a vulnerable spine before the accident and the accident made it significantly worse, the at-fault driver is responsible for what the accident did to you, not just for what it would have done to a hypothetically healthy person. This is sometimes called the eggshell plaintiff rule. Third-party reviewers who characterize your injury as entirely pre-existing are attempting to sidestep this doctrine, and they frequently succeed when the person on the other side of the claim does not know the rule exists.

If you receive notice that the insurance company is having your records reviewed by a third party, there are several things worth doing immediately. First, contact your treating physician and make sure they are aware of what is happening. Your doctor’s documented opinion carries more weight than a reviewer’s opinion in litigation, but only if it is clearly and thoroughly documented in your medical records. Gaps in treatment, vague symptom descriptions, or inconsistencies between what you told your doctor and what is in the claim file are exactly what reviewers use to undermine your credibility. Your treating physician should know that their records are going to be scrutinized and should ensure those records accurately capture your condition and its relationship to the accident.

Second, do not provide any additional authorizations or records requests without understanding exactly what you are being asked to sign. If the insurance company is asking for a broader authorization than you already provided, there is a reason. They are looking for something specific, and they believe it exists somewhere in your medical history. You are not required to help them find it.

Third, understand that if a third-party review results in a denial or a reduced offer, that is not the end of the road. It is a position. Your response to that position is to put your treating physician’s opinion in direct opposition to the reviewer’s, to point out the financial relationship between the reviewer and the insurer, and to make clear that you intend to let a jury evaluate which opinion is more credible if the insurer will not settle the claim fairly. Juries are not generally impressed by doctors who issue opinions without ever examining the patient, particularly when those doctors are being paid by the same company that benefits from the opinion.

The broader point is this: the third-party review process is not a neutral scientific exercise. It is a cost-containment tool that has been legitimized by its widespread use, not by its accuracy. Knowing that going in changes how you respond to every step of the process, from what authorizations you sign at the beginning to how you respond when the review comes back in the insurer’s favor. The insurance company has a system. The system is designed to reduce what they pay you. The only effective response to a system is understanding how it works well enough to interrupt it.

This article is intended for general informational purposes only and does not constitute legal advice. Medical record authorization, third-party review practices, and your rights as a claimant vary depending on the type of claim, the applicable insurance policy, and state law. If an insurance company has requested your medical records or issued a decision based on a third-party review, consult with a licensed personal injury attorney in your state before signing any authorization or accepting any offer.