Liability Insurance Claim Denied by At-Fault Driver's Insurer

If another driver caused your accident and their insurance company denied your claim, you're in a frustrating position. You did nothing wrong, yet you're being refused compensation for vehicle damage, medical bills, and lost wages. Third-party liability denials happen regularly and for many reasons — but policyholders who understand the system have real options to fight back.

How Third-Party Liability Claims Work

When the other driver is at fault, you make a claim against their bodily injury (BI) and/or property damage (PD) liability coverage. This is a third-party claim — you are not the policyholder; you have no direct contract with their insurer. That distinction matters: as a third party, you have fewer procedural rights under the policy, but you still have rights under state tort law and unfair claims settlement regulations.

The other driver's insurer has a duty to investigate claims in good faith. In most states, this includes a duty to deal fairly with third-party claimants — not just their own insured.

Common Reasons Third-Party Liability Claims Are Denied

Liability dispute. The insurer may claim their insured (the other driver) was not at fault, or shares fault with you. Without admitting liability, they can deny or reduce your claim. This is the most common denial reason.

Coverage lapse. The at-fault driver's policy may have lapsed before the accident. The insurer has no obligation to pay for losses occurring outside the coverage period.

Coverage limits exhausted. If another claimant (such as a pedestrian) has already made a claim, the policy's per-accident limits may be fully paid out. This is more common with serious multi-vehicle accidents.

Excluded driver. The at-fault driver may be listed as an excluded driver on the policy — for example, a household member who was excluded due to their driving record. In this case, no coverage exists for their actions.

Policy exclusions. Intentional acts, racing, and commercial use may be excluded under the at-fault driver's personal auto policy.

No cooperation from the insured. If the at-fault driver fails to cooperate with their own insurer's investigation, the insurer may issue a "reservation of rights" letter and ultimately deny coverage. This is not your fault but directly affects your ability to recover.

What To Do When a Third-Party Claim Is Denied

Step 1: Request the denial in writing. If the insurer verbally refuses your claim, demand written confirmation of the denial with the specific basis cited. You have a right to this documentation.

Step 2: Gather your evidence. Collect the police report, photographs, witness statements, dashcam footage, and any other evidence supporting the other driver's fault. Your case is essentially a civil negligence claim — evidence of their fault is your strongest tool.

Step 3: File a claim with your own insurer. If you carry collision coverage, file with your own insurer and let them pay for your vehicle repairs. Your insurer will then subrogate — that is, pursue the at-fault driver's insurer to recover what they paid you. This gets your car fixed faster without waiting for a third-party dispute to resolve.

Step 4: File a complaint with the state DOI. Many states extend unfair claims settlement practices protections to third-party claimants. A DOI complaint creates an official record and often prompts the insurer to reconsider.

Step 5: Send a demand letter. A formal written demand to the at-fault driver directly — not just their insurer — puts them on notice of your claim. If they have personal assets, they can be personally liable above any policy limits.

Step 6: Consider small claims or civil court. For vehicle damage and medical bills, you can sue the at-fault driver directly. Many liability disputes are resolved quickly once the driver faces personal legal exposure.

Using Your Own Uninsured/Underinsured Motorist Coverage

If the at-fault driver has no insurance, the policy has lapsed, or their limits are insufficient, your own UM/UIM coverage fills the gap. File with your own insurer under UM/UIM rather than waiting on a third-party denial to resolve.

Rental Car While Your Claim Is Disputed

You may be entitled to a rental vehicle while your car is out of service. Some states require the at-fault driver's insurer to provide a rental even during a liability investigation. If denied, document your rental costs — you can recover them as part of your damages.

When to Hire an Attorney

Third-party liability disputes involving significant bodily injury should always involve an attorney. For property damage only, a demand letter and DOI complaint may be sufficient. For injuries, lost wages, and pain and suffering, an attorney can pursue a tort claim directly against the at-fault driver, navigate uninsured motorist claims, and negotiate settlements that reflect your full damages.

Many personal injury attorneys handle auto accident claims on contingency — no upfront fees.

Fight Back With ClaimBack

Whether the denial came from the other driver's insurer or your own, ClaimBack can help you structure your appeal and fight for what you're owed. Start at https://claimback.app/appeal.

Related Reading

• How to Write an Insurance Appeal Letter
• Common Reasons Insurance Claims Are Denied
• Internal vs. External Insurance Appeal