Citizen's Guide to Colorado Uninsured / Underinsured Motorist Coverage
Citizen's Guide · Colorado UM/UIM

Citizen's Guide to Colorado Uninsured / Underinsured Motorist Coverage

How UM/UIM works in a Colorado personal auto policy, who is protected, what must be proved, and which policy clauses usually control the dispute after a serious collision.

Core point First-party bodily-injury protection under your own auto policy.
Policy focus Part III of the Colorado personal auto policy.
Main danger Settling the liability claim without checking the UM/UIM terms first.

What this guide is for

This page is for Colorado drivers, passengers, family members, and claimants who need to understand whether UM/UIM applies, what the policy actually says, and what records should be gathered before accepting an adjuster's position.

What this guide does

Explains how UM/UIM works, what the policy language says, where common disputes arise, and what a careful claimant should collect before settling or agreeing with the carrier's position.

What this guide does not do

It is not a substitute for the declarations page, the full policy with endorsements, the at-fault driver's liability disclosure, or a full damages analysis.

Reader warning: Do not settle the liability claim and sign a release before checking the UM/UIM policy language and obtaining written consent when the policy requires it.

Why this coverage matters

Colorado drivers often think UM/UIM is extra coverage that automatically pays if the crash was severe or if the other driver carried low limits. That is not how it works. UM/UIM is a separate first-party coverage with its own insuring agreement, definitions, exclusions, conditions, and coordination rules.

Start here first

  1. Get the declarations page showing whether UM/UIM was purchased and in what limits.
  2. Get the complete policy and endorsement schedule in force on the date of loss.
  3. Get the at-fault driver's liability disclosure, tender letter, or settlement papers.
  4. Get the crash report, witness statements, and hit-and-run reporting proof if relevant.
  5. Get the injured person's medical records, bills, wage-loss proof, and damages summary.
  6. Get every written communication with the UM/UIM carrier about notice, consent, offsets, or evaluation.

Overview: what UM/UIM does and does not do

  • UM/UIM usually protects against bodily injury, not routine damage to your own car.
  • Fault still matters under UM/UIM.
  • Damages still matter under UM/UIM.
  • The at-fault driver's available liability insurance still matters under UIM.
  • Settlement procedure still matters under UM/UIM.
  • The exact policy language matters at every step.

Plain-English issue spotting

1. Was UM/UIM actually purchased?

Start with the declarations page. Colorado generally requires UM/UIM to be offered up to the bodily-injury liability limits unless rejected in writing.

2. Who is the insured person?

This policy's definition is broader than just the named insured. It may include relatives, rated residents, permissive users, certain occupants, and derivative claimants.

3. Is the other vehicle uninsured, underinsured, or unknown?

The policy separately defines underinsured motor vehicle and uninsured motor vehicle and excludes several categories from both.

4. Were all liability limits exhausted?

This form says the carrier pays under Part III only after all applicable bodily-injury liability limits are exhausted by judgments or settlements.

5. Did the insured settle without written consent?

This is one of the most important danger points in the form.

6. Are offsets or other-insurance clauses reducing the claim?

This policy reduces recoverable damages by certain prior payments and bars duplicate payments for the same elements of damage.

Introduction and overview

UM/UIM is supposed to stand in the place of missing or inadequate liability insurance. In Colorado, it is consumer-protection coverage. But in practice, it is often one of the most disputed parts of the policy because it sits between three moving parts at once: liability coverage of the tortfeasor, the insured's own damages, and the insurer's policy defenses.

The insured usually has to prove there was an accident, the other motorist was legally responsible, the claimant qualifies as an insured person, the other motorist falls within the policy and statute, and uncompensated bodily-injury damages remain after all required offsets are applied.

The exact policy language, with reader guidance

The blocks below are structured for a public-facing guide page: exact policy text first, then plain-English guidance immediately underneath.

A. Insuring agreement — bodily injury coverage
If you pay the premium for this coverage, we will pay for damages that an insured person is legally entitled to recover from the owner or operator of an uninsured motor vehicle or an underinsured motor vehicle because of bodily injury: 1. sustained by an insured person; 2. caused by an accident; and 3. arising out of the ownership, maintenance or use of an uninsured motor vehicle or an underinsured motor vehicle. We will pay under this Part III only after the limits of liability under all applicable bodily injury liability bonds and policies have been exhausted by payment of judgments or settlements.
Guidance: This is the heart of the coverage. It confirms that UM/UIM is premium-based, that the damages must be legally recoverable from the uninsured or underinsured motorist, and that the form imposes an exhaustion requirement tied to judgments or settlements.
B. Uninsured motorist property damage coverage
If you pay the premium for this coverage, we will pay for damages that an insured person is legally entitled to recover from the owner or operator of an uninsured motor vehicle because of property damage: 1. caused by an accident; and 2. arising out of the ownership, maintenance, or use of an uninsured motor vehicle.
Guidance: This grant is narrower than bodily-injury coverage. It addresses property damage caused by an uninsured motor vehicle, not an underinsured one, and the policy's property-damage definition is itself narrow.
C. Notice requirement
Any insured person who brings a lawsuit against an owner or operator of: 1. an uninsured motor vehicle or an underinsured motor vehicle with respect to a bodily injury claim; or 2. an uninsured motor vehicle with respect to a property damage claim; must promptly notify us of the filing of said lawsuit.
Guidance: Treat this as mandatory. If suit is filed against the tortfeasor, the UM/UIM carrier should receive prompt written notice with proof of delivery.
D. Definition of insured person
Insured person means: a. you, a relative, or a rated resident; b. any person while operating or using a covered auto with the permission of you, a relative, or a rated resident; c. any person occupying, but not operating, a covered auto; and d. any person who is entitled to recover damages covered by this Part III because of bodily injury sustained by a person described above.
Guidance: This definition extends beyond the named insured. Many UM/UIM disputes turn on exactly where the injured person fits within this class.
E. Definition of underinsured motor vehicle
Underinsured motor vehicle means a land motor vehicle to which a bodily injury liability bond or policy applies at the time of the accident, but its limit of liability for bodily injury is less than the amount of the insured person's bodily injury damages. An underinsured motor vehicle does not include any vehicle or equipment owned by you, a relative, or a rated resident, available for their regular use, owned by a governmental unit, operated on rails or crawler treads, designed mainly for off-road use while not on public roads, located for use as a residence or premises, that is a covered auto, or that is an uninsured motor vehicle.
Guidance: Under this form, a vehicle is underinsured only if a bodily-injury liability policy exists but the available bodily-injury limit is less than the insured person's bodily-injury damages.
F. Definition of uninsured motor vehicle
Uninsured motor vehicle means a land motor vehicle or trailer of any type: a. to which no bodily injury liability bond or policy applies at the time of the accident; b. to which a bodily injury liability bond or policy applies at the time of the accident, but the bonding or insuring company denies coverage or is or becomes insolvent; c. that is a hit-and-run vehicle whose owner or operator cannot be identified and that causes an accident resulting in property damage or in bodily injury to an insured person, provided that the insured person, or someone on his or her behalf, reports the accident to the police or civil authority within 24 hours or as soon as practicable after the accident; or d. that is operated by an alleged tortfeasor who is deemed to be uninsured as set forth in Colorado Revised Statute 10-4-609, as amended.
Guidance: This definition reaches no-liability-coverage, denied-coverage, insolvency, and hit-and-run situations, and it expressly incorporates Colorado Revised Statute section 10-4-609.
G. Bodily-injury exclusions
Coverage under this Part III will not apply to bodily injury sustained while using or occupying a covered auto being used to carry persons or property for compensation or a fee, for retail or wholesale delivery, or for ride-sharing activity. Shared-expense car pools are excepted. It also will not apply to unauthorized use of another vehicle by you, a relative, or a rated resident; claims that directly or indirectly benefit a workers' compensation or disability insurer; punitive or exemplary damages; bodily injury where the claimant settles without written consent; or bodily injury arising out of a personal vehicle sharing program.
Guidance: These are not minor clauses. The written-consent-before-settlement exclusion is one of the most important warning points in the guide.
H. Limits of liability
The limit of liability shown on the declarations page for Uninsured/Underinsured Motorist Coverage is the most we will pay regardless of the number of claims made, covered autos, insured persons, lawsuits brought, vehicles involved in the accident, or premiums paid. If the declarations page shows split limits, the each-person amount is the most payable for all damages due to bodily injury to one person, and the each-accident amount is the most payable for all damages due to bodily injury to two or more persons in one accident. The each-person limit includes all derivative claims, including emotional injury, loss of society, loss of companionship, loss of services, loss of consortium, and wrongful death. If the declarations page shows a combined single limit, that amount is the most payable for the total of all bodily-injury damages resulting from any one accident.
Guidance: This language places derivative claims inside the same per-person cap for the injured person.
I. Offsets and anti-duplication language
The damages recoverable for bodily injury under this Part III will be reduced by all sums paid because of bodily injury by or on behalf of any persons or organizations that may be legally responsible and by sums paid under Part I — Liability To Others. We will not pay under this Part III any expenses paid or payable under Part II — Medical Payments Coverage. No one will be entitled to duplicate payments for the same elements of damages.
Guidance: Claimants should read every evaluation letter against this section and demand a written offset calculation.
J. Other insurance and arbitration
If there is other applicable uninsured or underinsured motorist coverage, we will pay only our share of the damages. Our share is the proportion that our limit of liability bears to the total of all available coverage limits. Coverage for a vehicle that is not a covered auto is excess over any other UM/UIM coverage. If the carrier and an insured person cannot agree on the legal liability of the operator or owner of an uninsured motor vehicle, or the amount of damages sustained by the insured person, the matter will be determined by arbitration only if both sides mutually agree to arbitration before the bodily-injury statute of limitations expires.
Guidance: This is the allocation clause for multi-policy situations. Arbitration on this form is optional, not automatic. The claimant should never assume the policy guarantees it.

What this form means in practice

The strongest consumer-side points

  • The policy expressly recognizes denied-coverage and insolvent-carrier situations within the definition of uninsured motor vehicle.
  • The policy expressly incorporates Colorado Revised Statute section 10-4-609.
  • The insured-person definition is broader than just the named insured.
  • The carrier pays the arbitrator's fees if arbitration is agreed.

The strongest insurer-side pressure points

  • Exhaustion of all applicable liability limits.
  • Prompt notice of suit.
  • The 24-hour or as-soon-as-practicable hit-and-run reporting requirement.
  • Written consent before settlement.
  • Fee-use, delivery, rideshare, and personal-vehicle-sharing exclusions.
  • Offsets, anti-duplication language, MedPay coordination, and other-insurance allocation rules.

What readers should do before accepting a denial or low offer

  1. Ask the carrier to identify each clause relied on.
  2. Ask the carrier to identify the exact status of the claimant under the definition of insured person.
  3. Ask whether the claim is being treated as uninsured, underinsured, hit-and-run, denied-coverage, or insolvency-based.
  4. Ask for the amount of every offset or credit being applied.
  5. Ask whether the carrier contends liability limits have been exhausted.
  6. Ask whether the carrier contends notice, consent, or reporting requirements were violated.

Checklist for a Colorado UM/UIM claimant

Basic documentsDeclarations page, full policy and endorsements, written UM/UIM rejection if the carrier says no UM/UIM was purchased, crash report, photos, witness information, and proof of police report in any unknown-driver case.
Liability-side recordsLiability policy disclosure, tender letter or settlement papers, reservation of rights or denial letter from the at-fault driver's insurer if any, and bankruptcy or insolvency information if relevant.
Damages recordsMedical records and bills, wage-loss documentation, narrative chronology of treatment, future-care or permanency support if applicable, and non-economic damages summary.
Procedure recordsWritten notice to the UM/UIM carrier, written request for consent before settlement, proof of delivery of notices, and any arbitration proposal or response.

Colorado authorities and public resources

Use these links as the public-resource block for the live page.

C.R.S. section 10-4-609Colorado UM/UIM statute.
C.R.S. section 42-7-103Colorado motor vehicle financial responsibility minimum liability limits.
C.R.S. sections 10-3-1115 and 10-3-1116Unreasonable delay or denial of insurance benefits.
C.R.S. section 10-3-1117Automobile policy disclosure procedures that may matter when evaluating tortfeasor limits and UIM-trigger issues.
Colorado General Assembly — Optional Automobile Insurance CoverageOfficial public overview for optional auto coverage topics.
Colorado General Assembly — Mandatory Automobile Insurance in ColoradoOfficial public overview of Colorado minimum insurance requirements.
Colorado Division of Insurance — Auto InsuranceColorado DOI consumer page for auto insurance.
Colorado Division of Insurance — Automobile Insurance Liability Policy Disclosure RequestsDOI resource for disclosure-request procedures.
Colorado Division of Insurance — File a ComplaintConsumer complaint path.
Colorado DMV — Colorado Motorist Insurance Identification Database (MIIDB)Colorado DMV insurance-verification information.
Colorado General Assembly — Laws portalGeneral Colorado laws portal for linked statutes.

Short glossary

UM
Uninsured motorist coverage.
UIM
Underinsured motorist coverage.
Insured person
The persons defined in Part III, not just whoever bought the policy.
Exhaustion
The form's requirement that applicable bodily-injury liability limits be paid out by judgment or settlement before UIM payment is owed.
Offset
A reduction claimed by the insurer because other sums have already been paid.
Derivative claim
A claim arising out of injury to another person, such as consortium or wrongful death.

Bottom line

UM/UIM is a separate first-party protection that can become critical when the at-fault driver has no insurance, denied coverage, insolvency, a hit-and-run status, or limits too low to cover the real bodily-injury damages. Read the declarations page, policy language, offsets, consent rules, and exhaustion terms before settling anything.

About this page

This page provides public-interest educational information and commentary. It is not legal advice, does not create an attorney-client relationship, and is not a substitute for advice from a qualified attorney. Every claim depends on its own facts, policies, deadlines, endorsements, and governing law.

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