Uninsured motorist (UM) and underinsured motorist (UIM) coverage is the part of your own auto insurance policy that pays when the other driver’s liability limits aren’t enough — or aren’t there at all. In Colorado, roughly 15% of drivers on the road carry no insurance, and among those who do carry it, many carry only the state minimum $25,000 per person / $50,000 per accident under C.R.S. 10-4-620. Neither situation covers a serious injury. Your UM/UIM coverage is what fills the gap.
This is a walk-through of how UM/UIM coverage actually works in Colorado — the statute that governs it, the stacking rule, the offset for the tortfeasor’s payments, and the specific traps that show up in these claims. If you were hit by an uninsured driver, a hit-and-run driver, or a driver who couldn’t cover your injuries, this is the framework a Colorado personal injury attorney will apply.
The governing statute: C.R.S. 10-4-609
Colorado’s uninsured/underinsured motorist statute is C.R.S. 10-4-609. Every auto insurance policy issued in Colorado must include an offer of UM/UIM coverage in an amount equal to the policy’s bodily injury liability limits. The insured can reject the coverage or select lower limits, but only by a signed written rejection.
Key provisions:
- Mandatory offer. The insurer must offer UM/UIM in an amount equal to the liability limits. If the insurer failed to make that offer, or failed to obtain a written rejection, courts have reformed policies to include UM/UIM at the liability limits.
- Uninsured motorist (UM). Applies when the at-fault driver has no liability insurance, or is a hit-and-run driver, or is driving a stolen vehicle.
- Underinsured motorist (UIM). Applies when the at-fault driver has some liability insurance but the limits are less than the damages caused.
- No exhaustion requirement (since 2008). Colorado eliminated the requirement that an injured party first exhaust the tortfeasor’s liability limits before pursuing UIM. You can pursue UIM and the tortfeasor’s liability claim in parallel.
- Setoff. UIM coverage is reduced (offset) by amounts recovered from the tortfeasor’s liability policy. If your UIM limit is $100,000 and you recover $25,000 from the tortfeasor, your net UIM recovery is capped at $75,000.
Stacking: Colorado allows it, and it can multiply your recovery
Colorado allows “stacking” of UM/UIM coverage across multiple vehicles insured under separate policies, and, since Ryder v. Mitchell and subsequent decisions, generally allows stacking across vehicles under the same policy where the policy language allows it. Stacking means the limits from multiple vehicles or policies are added together for a single claim.
Practical example. Household has three vehicles, each with $100,000 UIM coverage on a single policy. In a state that prohibited stacking, the injured driver would recover a maximum of $100,000. In Colorado, with proper stacking analysis and depending on policy language, the same injured driver may recover up to $300,000 in UIM coverage. The stacking analysis is technical and turns on the exact policy language, but it is one of the highest-leverage things a Colorado UM/UIM lawyer looks at first.
The three trigger scenarios
1. The at-fault driver has no insurance
The most straightforward UM scenario. The tortfeasor was uninsured, the police report confirms it, and the injured party’s only recovery route is their own UM coverage. C.R.S. 10-4-609 defines “uninsured motor vehicle” to include vehicles with no liability coverage at all.
2. Hit-and-run
A driver who fled the scene without being identified is treated as uninsured under C.R.S. 10-4-609(1)(c). But the statute imposes a procedural requirement: physical contact between the vehicles is generally required for a UM claim, unless the hit-and-run is corroborated by an independent witness (the “phantom vehicle” rule). If a driver ran you off the road without touching your vehicle, you need a witness statement to bring a UM claim.
3. Underinsured driver
The tortfeasor had some liability insurance, but the limits weren’t enough. Example: driver at fault carries the Colorado minimum $25,000 per person under C.R.S. 10-4-620. Your damages are $150,000. You recover $25,000 from the tortfeasor, and your UIM coverage picks up the balance up to the UIM policy limit (with the setoff).
Colorado sees this pattern often along the US 24 and Manitou Springs corridor. Tourist traffic mixes with local commuters year round, and many out-of-state drivers passing through carry only the minimum coverage their home states require, which is sometimes lower than Colorado’s. If an underinsured tourist causes a serious crash on the way down from Pikes Peak, your own UIM policy is the layer that has to cover the gap.
A real-world Colorado Springs UM/UIM scenario
A Bradford Pelton PC client was T-boned at an intersection in Colorado Springs by a hit-and-run driver who fled the scene. The client had lasting back and neck injuries requiring imaging, physical therapy, and eventually surgical intervention. Total damages were well into six figures. The client carried $250,000 in UM coverage on his own policy, and no coverage was available from the at-fault driver because they were never identified.
The claim posture: file a UM claim against the client’s own carrier for the full extent of damages. Key steps:
- Established the hit-and-run met the physical-contact requirement under C.R.S. 10-4-609(1)(c) — the vehicles collided, and multiple witnesses confirmed the fleeing car.
- Documented the full extent of injuries with treating specialists and, where the carrier disputed causation, retained an independent medical examiner.
- Analyzed stacking. The client had two vehicles on the policy; stacking analysis added a second $250,000 layer to the available UM coverage.
- Negotiated the claim against the carrier’s initial low-ball position. Colorado’s bad-faith statute at C.R.S. 10-3-1115 and 10-3-1116 gives an insured whose UM claim is unreasonably delayed or denied additional remedies — two times covered benefits plus attorney’s fees — which changes the negotiation dynamics significantly.
The claim resolved for a figure substantially higher than the initial offer. Every UM/UIM claim is different, and prior results do not guarantee similar outcomes, but the framework is the framework.
Bad-faith exposure: the carrier’s incentive changes when they know you know the statute
UM/UIM claims are contract claims — you against your own insurance company. That relationship is subject to Colorado’s insurance bad-faith framework:
- C.R.S. 10-3-1115. Prohibits an insurer from unreasonably delaying or denying payment of covered benefits.
- C.R.S. 10-3-1116. Creates a private right of action. An insured who prevails on a bad-faith claim recovers two times the covered benefit that was unreasonably delayed or denied, plus reasonable attorney’s fees and costs.
That statutory framework changes the calculus. A carrier that offers $30,000 on a $200,000 UIM claim is exposed to a bad-faith claim if the $30,000 offer is unreasonable in light of the claim documentation. UM/UIM adjusters know this; a well-prepared claim submission with clear documentation of damages usually gets a materially better initial offer for exactly this reason.
Statute of limitations for UM/UIM claims
UM/UIM claims are contract claims against the insurance carrier, not tort claims against the at-fault driver. Under C.R.S. 13-80-107.5, a UM/UIM contract claim must be commenced within three years of the date the insured knew or should have known that the UM/UIM claim was ripe — which typically means three years from the date the tortfeasor’s carrier tenders (or refuses to tender) its limits.
The underlying tort claim against the at-fault driver still has its own three-year deadline under C.R.S. 13-80-101(1)(n) (measured from the date of the accident). Managing both timelines is important — miss the tort SOL and you may prejudice the UM/UIM claim as well.
Common mistakes that hurt UM/UIM claims
- Settling with the at-fault driver’s carrier before analyzing UIM. If you release the tortfeasor without carrier consent, some UIM policies deny coverage entirely (although Colorado’s statute has significantly limited these “consent to settle” provisions). Always analyze UIM before signing any tortfeasor release.
- Recorded statements to your own UM/UIM adjuster. Your carrier owes you good faith, but the adjuster is still building a file. A recorded statement given without a lawyer’s guidance can lock in helpful admissions for the carrier.
- Missing stacking opportunities. If you have multiple vehicles on one policy, or coverage under a household member’s policy, the stacking analysis matters. This has to happen early.
- Failing to preserve the hit-and-run witness identification. If there was no physical contact, you need a witness who saw the phantom vehicle. Getting that witness statement quickly is critical.
- Waiting too long. Both the underlying tort claim and the UM/UIM contract claim have deadlines. Both require careful management.
How UM/UIM works alongside a wrongful death case
If a family member was killed by an uninsured or underinsured driver, UM/UIM coverage is often the primary source of recovery for the wrongful death claim. Colorado’s wrongful death statute C.R.S. 13-21-201 through 204 controls who can sue and what damages are recoverable, and the UM/UIM coverage on the decedent’s policy (and often household members’ policies through stacking) is what actually funds the claim.
Frequently asked questions
What statute governs UM/UIM claims in Colorado?
C.R.S. 10-4-609. It requires every Colorado auto insurance policy to offer UM/UIM coverage in an amount equal to the liability limits, and defines the coverage triggers.
Does Colorado allow stacking of UM/UIM coverage?
Yes. Multiple vehicles under separate policies stack. Stacking within a single policy across multiple vehicles is generally allowed depending on the policy language. This can multiply available coverage significantly.
Do I have to exhaust the at-fault driver’s policy before pursuing UIM?
No. Colorado eliminated the exhaustion requirement in 2008. You can pursue the tortfeasor claim and the UIM claim in parallel, subject to the setoff.
What is the setoff on a UIM claim?
Your UIM recovery is reduced by amounts recovered from the tortfeasor. If your UIM limit is $100,000 and you recover $25,000 from the tortfeasor, the maximum UIM recovery is $75,000.
Can I bring a bad-faith claim against my own carrier?
Yes, under C.R.S. 10-3-1115 and 10-3-1116. If your carrier unreasonably delays or denies payment of covered UM/UIM benefits, you can recover two times the covered benefit plus attorney’s fees.
What if the at-fault driver fled the scene?
Hit-and-run drivers are treated as uninsured under C.R.S. 10-4-609(1)(c), but the statute generally requires physical contact between the vehicles, unless a phantom-vehicle claim is corroborated by an independent witness.
How long do I have to file a UM/UIM claim in Colorado?
Three years under C.R.S. 13-80-107.5, generally measured from when the tortfeasor’s carrier tenders or refuses to tender its liability limits. The underlying tort claim has its own three-year clock under C.R.S. 13-80-101(1)(n).
Do I need a lawyer for a UM/UIM claim?
Almost always yes. UM/UIM claims are contract claims against your own carrier, and the carrier has adjusters and defense counsel working the file to keep the payout low. The stacking analysis, the bad-faith framework, and the setoff calculation are all technical enough that unrepresented claimants typically recover a fraction of what a represented claimant does. Bradford Pelton PC handles UM/UIM claims on contingency: no fee unless we recover.