Underinsured Motorist Coverage in Michigan: The Line on Your Policy That Decides Big Cases

Fifty thousand dollars sounds like real money until you've taken an ambulance ride, spent a night in a Lansing trauma unit, and started months of therapy. For a serious injury, it can be gone before you've finished treating — and in Michigan, $50,000 is the legal minimum in bodily injury liability coverage a driver can carry.

So here's a question worth answering before you ever need it: what happens when the person who hit you doesn't have enough insurance to cover what they did to you?

The Gap Nobody Thinks About Until It's Their Problem

Since Michigan's insurance reform, the default bodily injury liability limits are $250,000 per person and $500,000 per crash — but drivers are allowed to sign down to as little as $50,000/$100,000 (MCL 500.3009), and plenty do, because it's cheaper. The people most likely to cause a devastating crash are not reliably the people who bought generous coverage.

When your damages exceed the at-fault driver's policy limits, that driver is personally responsible for the difference. In theory. In practice, someone carrying minimum limits rarely has meaningful assets to pursue, and a judgment you can't collect doesn't pay for anything.

Underinsured motorist coverage — UIM — exists for exactly this situation. It's coverage on your own policy that steps in when the at-fault driver's liability limits are too small for your injuries. Its sibling, uninsured motorist coverage (UM), applies when the other driver has no insurance at all or flees the scene.

Neither one is required in Michigan. That's worth reading twice. The coverage that protects you from other people's bad decisions is optional, it's often bundled quietly into a policy, and many drivers have no idea whether they carry it or at what limits. Pull out your declarations page tonight and look. If UM/UIM isn't there, or it's a token amount, fixing that is one of the cheapest meaningful things you can do for your family — the premium difference is usually modest compared to what the coverage does.

How a UIM Claim Actually Works

A UIM claim is strange the first time you see one, because the roles flip. You still have to prove the other driver was at fault and prove the full extent of your damages — the same fault analysis as any third-party claim against an at-fault driver — but the company evaluating and resisting that claim is now your own insurer. The company you've paid premiums to for years sits across the table, and it evaluates your claim the way any insurer evaluates a claim it may have to pay.

A few features of these claims trip people up:

The consent-to-settle trap. Most Michigan UIM policies require you to get your own insurer's written consent before accepting the at-fault driver's policy limits. Settle without it and you can void your UIM coverage entirely — because your insurer holds rights to recover against the at-fault driver, and an unauthorized settlement extinguishes them. It's a technicality that has destroyed six-figure claims.

Deadlines come from the contract, not the statute books. Michigan's general limitations period for injury claims is three years, but UIM is a creature of contract. Policies can and do impose shorter notice and filing deadlines. Waiting to "see how treatment goes" can quietly forfeit the coverage.

The limits question. Before you can know whether a driver is underinsured, you need to know their limits — and insurers are rarely eager to volunteer that information early. Getting it, and documenting the demand, is part of building the claim.

When Your Own Insurer Drags Its Feet

Insurers sometimes slow-walk UIM claims: requests for records they already have, long silences, adjuster handoffs. Michigan law isn't toothless here. When benefits are owed and payment is unreasonably delayed, penalty interest of 12% per year can attach under the Uniform Trade Practices Act (MCL 500.2006), and an insurer that refuses to honor its contract can be sued for breach like anyone else.

The practical answer to foot-dragging is a well-documented claim: a complete medical record, a clear liability presentation, and written demands that create a paper trail. Insurers respond differently to claims that are built to be tried.

What This Looks Like in Real Life

Picture a passenger seriously hurt at an intersection by a driver who ran a light. The at-fault driver carries low limits. The injured passenger's medical treatment stretches across months — therapy, specialist referrals, symptoms that won't fully resolve. The at-fault driver's insurer eventually pays its limits, and it still isn't close to fair compensation.

Whether that person is made whole may come down to a coverage selection they made — or didn't make — years earlier, and to whether their UIM claim was handled by someone who knew where the traps were. That's the whole story of underinsured motorist coverage: it's boring right up until it's the most important paragraph in your policy.

Get Your Policy Reviewed Before You Need It — or Get Help Now

If you're healthy and reading this out of curiosity, check your declarations page and call your agent about UM/UIM limits that match your liability coverage. If you've already been hurt and you suspect the at-fault driver's insurance won't be enough, don't sign anything or accept any settlement before understanding your UIM rights.

Baldori Law handles serious injury and underinsured motorist claims across mid-Michigan from our office in Okemos. Bring us your declarations page and the crash details — the consultation is free. Call (517) 927-7928.

This article is general information about Michigan law, not legal advice about your specific situation, and reading it doesn't create an attorney-client relationship. Deadlines and coverage depend on your facts and your policy — get advice on your facts.