UM/UIM disputes can get complicated fast. One carrier may be evaluating the at-fault driver’s liability limits while another is reviewing your own uninsured or underinsured motorist coverage. A settlement offer that looks straightforward on paper can raise a second set of questions about notice, consent, subrogation, exhaustion, and deadlines.
That is one reason these cases often feel unusually procedural. A person can be badly hurt, the liability carrier can offer its limits, and yet the claim still isn’t “done.” In many states, accepting that offer without following the right notice process can create a separate fight with the UM/UIM insurer.
If you’re trying to understand where settlement demands, policy limits, and notice obligations fit into a UM/UIM case, this post walks through the major issues in plain English. For a broader overview of how this coverage works, it may help to start with this guide to when the other driver lacks enough insurance.
<aside> 💡 Scroll to the bottom for every post in this series.
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Uninsured motorist and underinsured motorist coverage exists because many drivers either carry no insurance or carry too little to fully cover a serious injury claim. According to the Insurance Information Institute, 14.0% of motorists nationwide were uninsured in 2022, or about one in seven drivers. The same source notes that UM/UIM rules vary significantly by state, including whether coverage is required and how claims are handled (Insurance Information Institute).
The Insurance Information Institute also explains the basic distinction: UM coverage generally applies when the at-fault driver has no insurance or is unidentified in some hit-and-run situations, while UIM coverage generally applies when the at-fault driver has liability insurance, but the available limits are not enough to cover the injured person’s losses (Insurance Information Institute).
That sounds simple, but the settlement process often isn’t. In general terms, a UM/UIM claim may involve questions like:
Those details can directly affect whether additional benefits remain available.
A settlement demand is often a written package sent to an insurer explaining liability, injuries, treatment, damages, and the amount requested to resolve the claim. In a UM/UIM setting, there may be more than one demand: