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Personal Injury Glossary

Third Party Claim

Definition
A third party claim is a claim you file against someone else’s insurance company rather than your own — for example, claiming against the at-fault driver’s liability policy after a crash they caused.

The distinction between first party and third party claims determines who you are dealing with, what they owe you, and how much they will fight.

A first party claim is against your own insurer under your own policy. A third party claim is against someone else’s insurer for harm they caused you.

The difference matters more than the terminology suggests, because the legal duties owed to you are not the same.

The Key Difference: Who Owes You What

Your own insurer owes you contractual duties arising from the policy you bought, including a duty of good faith in handling your claim.

The other driver’s insurer owes you no such duty. Its obligations run to its own policyholder, not to you. Its job is to resolve the claim for as little as possible.

This is why the friendly adjuster who calls promptly after a crash is not on your side, however helpful the tone. That is not cynicism, it is the structure of the relationship.

How A Third Party Claim Works

You report the crash to the at-fault driver’s insurer, which opens a claim and assigns an adjuster. They investigate liability, evaluate damages, and make an offer.

Unlike a first party claim, there is generally no deductible and no direct effect on your own premium — although a claim can still appear in shared industry claims history.

Two things are worth knowing. You are not required to give a recorded statement, and you are not required to sign a blanket medical authorisation covering your entire history.

When You Might Use Both

These are not mutually exclusive. You might use MedPay on your own policy to cover medical bills immediately while pursuing a third party claim for the full value.

If the at-fault driver is uninsured or underinsured, your own UM/UIM coverage becomes a first party claim on the same crash.

Where your own insurer pays first, it may assert subrogation — a right to be repaid from your third party recovery.

In The Workers’ Compensation Context

The phrase carries a specific meaning in comp. Workers’ compensation is generally your exclusive remedy against your employer, but it does not bar a claim against a third party who caused the injury.

A negligent driver who hits you while you are working, an outside contractor on site, or the manufacturer of defective equipment can all be third party defendants alongside the comp claim.

This matters because comp does not pay for pain and suffering while a third party claim can. Your employer’s insurer may assert a lien against that recovery, so the two should be evaluated together.

In Short

Key Takeaways

  • A third party claim is against someone else’s insurer; a first party claim is against your own.
  • The other side’s insurer owes you no duty of good faith — its obligations run to its policyholder.
  • There is generally no deductible on a third party claim and no direct premium effect.
  • You are not required to give a recorded statement or sign a blanket medical authorisation.
  • First and third party claims often run together, with subrogation resolving the overlap.
  • In workers’ comp, a third party claim can recover pain and suffering that comp does not pay.
Common Questions

Frequently Asked Questions

What is the difference between a first party and third party claim?

A first party claim is against your own insurer under your policy. A third party claim is against the at-fault person’s insurer. The practical difference is that your own insurer owes you a duty of good faith and theirs does not.

Do I have to talk to the other driver’s insurance company?

You will generally need to communicate to pursue the claim, but you are not required to give a recorded statement, and you are not required to sign a broad authorisation releasing your entire medical history.

Will a third party claim raise my insurance rates?

Generally not directly, since the payment comes from the at-fault party’s policy. Claim activity can still appear in shared industry databases, and some insurers weigh any claim history at renewal.

Can I file a third party claim for a work injury?

Yes, where someone other than your employer or a coworker caused it — a negligent driver, an outside contractor, or an equipment manufacturer. That claim can include pain and suffering, which workers’ compensation does not pay.

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