You’re injured in a crash. Your own auto insurance includes uninsured motorist coverage. Your health insurance also covers accident injuries. Both policies have language saying they’re “secondary” to other coverage. So who actually pays your medical bills? Welcome to the confusing world of conflicting insurance policies.
Below, our friends at Warner & Fitzmartin – Personal Injury Lawyers explain what happens when two insurance policies conflict.
When Multiple Policies Say “You Go First”
Insurance conflicts typically happen when you’re covered by more than one policy for the same type of loss. The classic scenario: you’ve got health insurance through your job and auto insurance with uninsured motorist coverage. You’re hurt in a crash, and both policies include coordination of benefits clauses that make them secondary to “other applicable coverage.”
Each insurer points to the other and says “they should pay first.” It’s like a game of hot potato, except the potato is your unpaid medical bill.
How Common Is This Problem?
According to a 2025 study by the Insurance Research Council, 15.4 percent of drivers—more than one in seven—were uninsured in 2023. That’s when your uninsured motorist coverage should kick in. But according to the same IRC study, 18 percent of drivers were underinsured that same year, meaning their coverage limits won’t fully cover your damages.
When you’re dealing with uninsured or underinsured drivers, multiple policies become relevant fast. And that’s when coordination of benefits clauses start creating headaches.
The Coordination Of Benefits Framework
Insurance companies don’t want to pay twice for the same loss, so they’ve developed coordination of benefits rules. In theory, these rules establish which policy pays first (primary) and which pays second (secondary).
According to the National Association of Insurance Commissioners, most states have adopted coordination of benefits model regulations that create a priority system. For instance, if you’re covered as an employee under one plan and as a dependent under another, your employee coverage is primary.
But here’s the thing—different types of insurance follow different coordination rules, and those rules don’t always play nice together.
Auto Versus Health Insurance Conflicts
Car accident lawyers know that the most common conflict happens between auto insurance and health insurance. Many health insurance policies say they’re secondary to auto insurance, especially when the injury happens in a vehicle. Meanwhile, some auto policies—particularly “coordinated” policies that cost less—say they’re secondary to health insurance.
When both policies claim to be secondary, you’ve got a standoff. Courts in different states have reached different conclusions about how to resolve this. Some states have passed laws saying auto insurance must pay first. Others enforce whichever coordination clause is more specific.
In some cases, you might actually get to collect from both policies if they’re both “uncoordinated”—meaning neither has language making itself secondary. But that’s rare, and you’ll need to read the fine print carefully.
Stacking Issues With Multiple Auto Policies
Another conflict arises when you have multiple auto insurance policies and you’re trying to “stack” your uninsured motorist coverage. Stacking means combining the limits from different policies or different vehicles to get more total coverage.
Thirty-two states allow some form of stacking, but the rules vary wildly. Some allow “vertical stacking” (combining coverage from multiple vehicles on one policy). Others allow “horizontal stacking” (combining coverage from separate policies). Some allow both.
But even in states that permit stacking, insurance companies can—and do—include anti-stacking language in their policies. When one policy allows stacking and another prohibits it, determining your actual coverage becomes a puzzle.
Workers’ Comp And Other Coverage
Workers’ compensation adds another layer of complexity. If you’re injured in a vehicle crash while on the job, you might have a workers’ comp claim, an auto insurance claim, and possibly a third-party liability claim against the at-fault driver.
Workers’ comp is usually primary for on-the-job injuries, but auto insurance might cover things workers’ comp doesn’t—like pain and suffering. Coordinating these claims requires careful attention to what each policy actually covers and in what order.
ERISA Plans Complicate Things Further
If your health insurance comes from your employer through a self-funded ERISA plan, the rules get even more complicated. ERISA is federal law, and it can override state insurance regulations. Some ERISA plans have strong coordination of benefits clauses that courts will enforce even when state law might say otherwise.
ERISA plans often have subrogation rights too, meaning they can demand reimbursement if you recover money from the at-fault driver. These reimbursement demands can conflict with your auto insurance settlements.
What You Can Do
If you’re facing conflicting insurance policies, don’t just accept the first “no” you hear from an insurance company. Here’s how to protect yourself:
Get everything in writing. Make both insurers put their coverage position in writing, including which policy provision they’re relying on.
Review all policy language. The coordination of benefits clause matters, but so do definitions, exclusions, and state-specific endorsements.
Don’t let bills go to collections. If insurers are fighting over who pays, you might need to pay bills yourself and seek reimbursement later, or work with providers to put bills on hold.
Know your state’s rules. Some states have specific laws addressing insurance conflicts. These can override policy language.
Consider getting help. When insurers refuse to pay because they’re pointing fingers at each other, you might need professional help sorting it out.
The Bottom Line
Insurance conflicts happen because different policies use different coordination rules, and those rules weren’t designed to work together. When you’re stuck in the middle, your unpaid bills don’t care which insurance company is “right” about who should pay first.
Understanding how coordination of benefits works—and knowing when to push back on an insurer’s coverage position—can make the difference between getting your medical bills paid and being left holding the bag.