📋 What is UM/UIM Coverage?

Uninsured Motorist (UM) and Underinsured Motorist (UIM) coverage protects you when you're injured by a driver who either has no insurance or insufficient insurance to cover your damages. In California, UM coverage is mandatory - every auto insurance policy must include it unless you specifically reject it in writing. When insurers wrongfully deny or undervalue these claims, policyholders have powerful legal remedies.

Understanding UM vs. UIM Coverage

🚗 Uninsured Motorist (UM)

Covers you when hit by a driver with no liability insurance, a hit-and-run driver, or a driver whose insurer is insolvent

💰 Underinsured Motorist (UIM)

Covers the gap when the at-fault driver's policy limits are insufficient to cover your full damages

✅ Mandatory in California

Cal. Ins. Code 11580.2 requires all auto policies to include UM coverage unless validly waived in writing

🛡 First-Party Claim

You're claiming against your own insurer, who owes you a duty of good faith and fair dealing

When to Use This Guide

Use this guide if your California auto insurer has:

Denied Your UM/UIM Claim

Your insurer rejected your claim outright, claiming you weren't covered, the accident wasn't covered, or the at-fault driver was actually insured. Common wrongful denial reasons include: claiming you weren't in a "covered vehicle," disputing that the other driver was uninsured, or alleging policy exclusions apply.

💰 Lowballed Your Settlement

Your insurer offered far less than your claim is worth. Common tactics include undervaluing medical expenses, disputing the necessity of treatment, minimizing pain and suffering, or claiming pre-existing conditions caused your injuries.

🕑 Delayed Processing Your Claim

Your insurer is unreasonably delaying investigation, evaluation, or payment of your valid claim. Under California regulations, insurers must acknowledge claims within 15 days and accept/deny within 40 days of receiving proof of claim.

🔍 Failed to Properly Investigate

Your insurer denied or undervalued your claim without conducting a thorough, fair, and timely investigation. This includes failing to obtain all relevant medical records, ignoring your treating physicians' opinions, or relying on biased "independent" medical exams.

👍 What You Can Recover in a UM/UIM Claim

  • Medical expenses - Past and future medical treatment related to your injuries
  • Lost wages - Income lost due to your injuries and recovery
  • Loss of earning capacity - Diminished future earning potential
  • Pain and suffering - Physical pain and emotional distress
  • Property damage - Vehicle repair or replacement costs
  • Policy limits - Up to your full UM/UIM coverage amount

⚠ Critical Deadlines

California has strict time limits for UM/UIM claims:

  • Statute of limitations: 2 years from the date of the accident (CCP 335.1)
  • Policy notice requirements: Check your policy for claim filing deadlines
  • Arbitration demand: Must be filed within the limitations period

Do not delay - the 2-year deadline is strictly enforced.

💰 Damages & Recoverable Amounts

Understanding what you can recover helps you value your claim accurately. UM/UIM claims can include both policy benefits and, in bad faith cases, additional damages.

UM/UIM Policy Benefits

Damage Category Description
Medical Expenses All reasonable and necessary medical treatment: emergency care, hospitalization, surgery, physical therapy, chiropractic care, medications, and future medical needs.
Lost Wages Income lost during recovery, including salary, hourly wages, bonuses, commissions, and self-employment income. Must be documented with pay stubs and employer verification.
Loss of Earning Capacity Reduced ability to earn in the future due to permanent injuries. Often requires vocational expert testimony to establish.
Pain and Suffering Physical pain, discomfort, and limitations on daily activities. California allows significant recovery for non-economic damages.
Emotional Distress Anxiety, depression, PTSD, and other psychological impacts from the accident and injuries.
Loss of Enjoyment of Life Inability to participate in activities and hobbies you enjoyed before the accident.

Bad Faith Damages (If Insurer Acts Wrongfully)

If your insurer unreasonably denies, delays, or undervalues your UM/UIM claim, you may recover additional damages:

💰 Brandt Attorney Fees

Attorney fees incurred to obtain your UM/UIM benefits - recoverable as damages, not just costs

📈 Consequential Damages

Economic harm caused by the denial: credit damage, lost investments, foreclosure costs, etc.

💔 Emotional Distress

Mental anguish from the insurer's bad faith conduct - separate from accident-related distress

⚠ Punitive Damages

Available when insurer acted with malice, oppression, or fraud - no statutory cap

📊 Sample UM/UIM Damages Calculation

Example: Moderate Injury - Herniated Disc, 6 Months Treatment

Emergency room and ambulance $8,500
Orthopedic treatment and imaging $12,000
Physical therapy (6 months) $9,600
Future medical care estimate $15,000
Lost wages (3 months) $18,000
Pain and suffering (3x medical) $135,000
TOTAL CLAIM VALUE $198,100

⚠ UIM Offset Rule

In California, your UIM recovery is reduced by any amount you receive from the at-fault driver's liability insurance. For example, if you have $100,000 UIM coverage and receive $30,000 from the at-fault driver's policy, your maximum UIM recovery is $70,000, even if your damages exceed $100,000. This is called the "limits credit" or "offset" rule.

💡 Policy Limits and Stacking

California law generally prohibits "stacking" UM/UIM coverage from multiple vehicles on the same policy. However, you may be able to stack coverage from different policies (e.g., your policy and a household member's separate policy). Check your specific policy language and consult with an attorney about stacking options.

Evidence Checklist

Gather these documents before sending your demand letter. Click to check off items as you collect them.

📄 Policy Documents

  • Complete auto insurance policy with declarations page
  • UM/UIM coverage endorsements and limits
  • Premium payment records showing policy was in effect
  • Any UM/UIM waiver forms (or lack thereof)

🚗 Accident Documentation

  • Police report with report number
  • Photos of accident scene, vehicles, and injuries
  • Witness statements and contact information
  • Proof the at-fault driver was uninsured/underinsured
  • DMV records showing other driver's insurance status

🏥 Medical Records

  • Emergency room records and bills
  • All treating physician records and notes
  • Diagnostic imaging (X-rays, MRIs, CT scans)
  • Physical therapy records
  • Prescription records and pharmacy bills
  • Future care estimate from treating physician

💰 Financial Losses

  • Pay stubs for 3-6 months before accident
  • Employer verification of time missed
  • Tax returns (if self-employed)
  • Vehicle repair estimates or total loss valuation
  • Rental car receipts

📩 Insurance Communications

  • Claim acknowledgment letter
  • All correspondence with your insurer
  • Denial letter with stated reasons
  • Settlement offers and your responses
  • Recorded statements you provided

📖 Additional Evidence

  • Pain journal documenting daily symptoms
  • Photos showing injuries over time
  • Declarations from family/friends about limitations
  • Documentation of activities you can no longer do

🔒 Request Your Complete Claim File

Under California law, you are entitled to a copy of your entire claim file. Send a written request to your insurer demanding all documents, notes, evaluations, and communications related to your UM/UIM claim. This file may reveal evidence of bad faith, including adjuster notes showing they ignored favorable evidence or were pressured to deny claims.

📝 Sample Language

Copy and customize these paragraphs for your California UM/UIM demand letter. Each addresses a different scenario or element of your claim.

Opening - Wrongful Denial
I am writing to formally demand payment of Uninsured Motorist benefits under my automobile insurance policy, Policy No. [POLICY NUMBER]. On [DATE OF ACCIDENT], I was injured in a motor vehicle collision caused by an uninsured driver. Despite my timely claim and substantial documented injuries, [INSURANCE COMPANY] has wrongfully denied my claim. This denial violates California Insurance Code Section 11580.2 and constitutes a breach of the duty of good faith and fair dealing owed to me as your insured.
Opening - Undervalued Claim
I am writing regarding my Underinsured Motorist claim under Policy No. [POLICY NUMBER], Claim No. [CLAIM NUMBER]. While I appreciate your offer of $[OFFERED AMOUNT], this amount is grossly inadequate to compensate me for my documented injuries and losses totaling $[TOTAL DAMAGES]. The at-fault driver's liability coverage of $[LIABILITY LIMITS] was insufficient to cover my damages, triggering my UIM coverage. I am entitled to the full difference up to my policy limits.
Establishing UM Coverage Applies
California Insurance Code Section 11580.2 mandates that every automobile liability policy issued in California include Uninsured Motorist coverage. My policy provides UM/UIM limits of $[COVERAGE LIMITS]. The at-fault driver, [AT-FAULT DRIVER NAME], was confirmed to be uninsured/underinsured as evidenced by [DMV RECORDS / DECLARATION FROM OTHER INSURER / POLICE REPORT]. There is no valid waiver of UM coverage on file, and all policy conditions have been satisfied. My claim clearly falls within the coverage provided.
Medical Expenses and Treatment
As a direct result of this collision, I sustained [DESCRIBE INJURIES - e.g., cervical disc herniation at C5-C6, lumbar strain, and soft tissue injuries to the shoulder]. My medical treatment has included [DESCRIBE TREATMENT - e.g., emergency room care, orthopedic consultation, MRI imaging, 24 sessions of physical therapy, and ongoing pain management]. My treating physician, Dr. [PHYSICIAN NAME], has documented that my injuries are causally related to the accident and that I will require ongoing treatment estimated at $[FUTURE MEDICAL ESTIMATE]. Total medical expenses to date are $[AMOUNT], with itemized bills attached hereto as Exhibit A.
Lost Wages and Earning Capacity
Due to my injuries, I was unable to work from [START DATE] to [END DATE], a period of [NUMBER] weeks. My employer, [EMPLOYER NAME], has verified my average weekly earnings of $[AMOUNT]. Accordingly, my lost wages total $[TOTAL LOST WAGES]. Additionally, my treating physician has placed permanent work restrictions that limit my ability to [DESCRIBE LIMITATIONS], resulting in a diminished earning capacity that I am entitled to recover.
Pain and Suffering
Beyond my economic losses, I have endured significant physical pain and emotional suffering as a result of this accident. I experience daily pain rated at [PAIN LEVEL] on a 10-point scale. My injuries have prevented me from [DESCRIBE ACTIVITIES - e.g., playing with my children, exercising, sleeping through the night, and performing household tasks]. I have been diagnosed with [ANXIETY/DEPRESSION/PTSD] related to the accident. Under California law, I am entitled to substantial compensation for these non-economic damages.
Bad Faith Allegations
[INSURANCE COMPANY]'s handling of my UM/UIM claim constitutes bad faith under California law. Specifically, your company has: (1) [failed to conduct a reasonable investigation of my claim]; (2) [ignored the opinion of my treating physicians in favor of a biased IME]; (3) [delayed processing my claim for over [X] days without justification]; and (4) [offered an unreasonably low settlement that does not account for my documented damages]. This conduct violates California Insurance Code Section 790.03(h) and the duty of good faith established in Quintano v. Mercury Casualty Co. (1995) 11 Cal.4th 1049. I am entitled to recover Brandt fees, consequential damages, and punitive damages.
Demand and Deadline
Based on the foregoing, I hereby demand payment of $[TOTAL DEMAND AMOUNT] within thirty (30) days of the date of this letter. This demand includes:

- Medical expenses (past and future): $[AMOUNT]
- Lost wages: $[AMOUNT]
- Pain and suffering: $[AMOUNT]
- Total: $[TOTAL]

If this demand is not satisfied by [DEADLINE DATE], I will immediately demand arbitration pursuant to California Insurance Code Section 11580.2(i) and will pursue a separate bad faith action in the California Superior Court seeking Brandt fees, consequential damages, and punitive damages.
Arbitration Demand Reference
Please be advised that if we cannot reach a reasonable settlement within the time specified, I intend to demand binding arbitration pursuant to California Insurance Code Section 11580.2(i). Under this statute, disputes regarding the amount of UM/UIM damages shall be resolved through arbitration. The arbitrator will be empowered to award the full value of my damages up to my policy limits of $[POLICY LIMITS]. Additionally, any bad faith conduct in handling this claim will be addressed in a separate civil action where punitive damages are available.

📄 Full Sample Demand Letter

Below is a complete, ready-to-use UM/UIM demand letter template. Replace all bracketed placeholders with your specific information.

Complete UM/UIM Denial Demand Letter Template

[YOUR NAME] [YOUR ADDRESS] [CITY, STATE ZIP] [YOUR PHONE NUMBER] [YOUR EMAIL] [DATE] VIA CERTIFIED MAIL, RETURN RECEIPT REQUESTED [INSURANCE COMPANY NAME] [CLAIMS DEPARTMENT] [INSURER ADDRESS] [CITY, STATE ZIP] Re: Demand for Payment of UM/UIM Benefits Insured: [YOUR NAME] Policy No.: [POLICY NUMBER] Claim No.: [CLAIM NUMBER] Date of Loss: [DATE OF ACCIDENT] Dear Claims Manager: I am writing to formally demand payment of Uninsured/Underinsured Motorist benefits under the above-referenced automobile insurance policy. As detailed below, [INSURANCE COMPANY NAME] has failed to fairly evaluate and pay my valid UM/UIM claim, in violation of California Insurance Code Section 11580.2 and the duty of good faith and fair dealing. FACTUAL BACKGROUND On [DATE OF ACCIDENT], at approximately [TIME], I was operating my [YEAR, MAKE, MODEL] vehicle on [STREET/HIGHWAY] in [CITY], California. The at-fault driver, [AT-FAULT DRIVER NAME], operating a [DESCRIPTION OF OTHER VEHICLE], [DESCRIBE HOW ACCIDENT OCCURRED - e.g., ran a red light and collided with the driver's side of my vehicle / rear-ended my vehicle while I was stopped at a traffic light / crossed into my lane and struck my vehicle head-on]. The collision was caused solely by the negligence of [AT-FAULT DRIVER NAME], as documented in the police report, Report No. [POLICE REPORT NUMBER]. The at-fault driver was cited for [VIOLATION, IF ANY]. Investigation has confirmed that the at-fault driver [was uninsured at the time of the accident / carried liability insurance with limits of only $[AMOUNT], which is insufficient to compensate me for my damages]. This triggers my UM/UIM coverage under my policy with [INSURANCE COMPANY NAME]. POLICY COVERAGE My automobile insurance policy, Policy No. [POLICY NUMBER], was in full force and effect on the date of the accident. I have paid all premiums and have complied with all policy conditions, including timely notice of the claim. The policy provides UM/UIM coverage with limits of [COVERAGE LIMITS - e.g., $100,000 per person / $300,000 per occurrence]. Under California Insurance Code Section 11580.2, UM coverage is mandatory in California and must be included in every automobile liability policy unless validly waived in writing on a form specified by the statute. No such waiver exists for my policy. MY INJURIES AND TREATMENT As a direct and proximate result of this collision, I sustained the following injuries: [LIST INJURIES - e.g., - Cervical disc herniation at C5-C6 - Lumbar strain/sprain - Left shoulder rotator cuff tear - Post-traumatic headaches - Anxiety and sleep disturbance] I received emergency treatment at [HOSPITAL NAME] on the date of the accident. Since then, I have undergone extensive medical treatment including: [DESCRIBE TREATMENT - e.g., - Orthopedic evaluation and treatment with Dr. [NAME] - MRI of cervical and lumbar spine - 36 sessions of physical therapy - Pain management with epidural steroid injections - Ongoing treatment for persistent symptoms] My treating physicians have documented that all of my injuries were caused by this accident and that I will require future medical treatment including [DESCRIBE EXPECTED FUTURE TREATMENT]. DAMAGES My documented damages are as follows: MEDICAL EXPENSES: Emergency room and ambulance: $[AMOUNT] [PROVIDER NAME] - Orthopedic care: $[AMOUNT] [IMAGING CENTER] - MRI studies: $[AMOUNT] [PHYSICAL THERAPY PROVIDER]: $[AMOUNT] [ADDITIONAL PROVIDERS]: $[AMOUNT] Prescription medications: $[AMOUNT] Future medical care (per Dr. [NAME]): $[AMOUNT] __________ TOTAL MEDICAL EXPENSES: $[TOTAL MEDICAL] LOST WAGES: I was unable to work from [START DATE] to [END DATE], a period of [NUMBER] weeks. My average weekly earnings were $[AMOUNT], as verified by my employer. Total lost wages: $[TOTAL LOST WAGES] PAIN AND SUFFERING: I have experienced and continue to experience significant physical pain, including daily discomfort rated [X]/10, difficulty sleeping, and limitations on my daily activities. I am no longer able to [DESCRIBE ACTIVITIES YOU CANNOT DO]. I have also suffered emotional distress including anxiety about driving and depression related to my diminished quality of life. Based on the severity and permanence of my injuries, my pain and suffering damages are valued at $[AMOUNT]. TOTAL DAMAGES: $[GRAND TOTAL] [IF UIM CLAIM: Less amount received from at-fault driver's policy: ($[AMOUNT]) NET UIM CLAIM: $[NET AMOUNT]] YOUR COMPANY'S IMPROPER HANDLING OF MY CLAIM Despite my timely notice, complete documentation, and clear entitlement to UM/UIM benefits, [INSURANCE COMPANY NAME] has [denied my claim / offered only $[LOW AMOUNT] to settle my claim]. This conduct is unreasonable and constitutes bad faith. [DESCRIBE SPECIFIC BAD FAITH CONDUCT - select and customize as applicable: - Your company denied my claim without conducting a reasonable investigation - Your company ignored the opinions of my treating physicians - Your company relied on a biased IME that contradicts my documented medical records - Your company failed to respond to my claim within the time required by California regulations - Your company offered an amount that no reasonable insurer would believe adequately compensates my injuries - Your company misrepresented the policy coverage to justify the denial] This conduct violates California Insurance Code Section 790.03(h), which prohibits unfair claims settlement practices, and breaches the duty of good faith and fair dealing established by the California Supreme Court in Gruenberg v. Aetna Insurance Co. (1973) 9 Cal.3d 566 and Quintano v. Mercury Casualty Co. (1995) 11 Cal.4th 1049. DEMAND I hereby demand payment of $[DEMAND AMOUNT] within thirty (30) days of the date of this letter. This amount represents fair compensation for my injuries and losses, [less the offset for amounts received from the at-fault driver's insurer if applicable]. If I do not receive satisfactory payment by [DEADLINE DATE - 30 days from letter date], I will take the following actions: 1. Demand binding arbitration pursuant to California Insurance Code Section 11580.2(i) to recover my full UM/UIM benefits up to policy limits; 2. File a bad faith lawsuit in the California Superior Court seeking: - Brandt attorney fees pursuant to Brandt v. Superior Court (1985) 37 Cal.3d 813 - Consequential damages caused by your company's wrongful conduct - Emotional distress damages - Punitive damages pursuant to Civil Code Section 3294 3. File a complaint with the California Department of Insurance documenting your company's unfair claims settlement practices. I urge you to reevaluate this claim fairly and make a reasonable settlement offer. Your company's continued bad faith handling of this claim will only increase your ultimate exposure. Please direct all further communications regarding this claim to the address above [or to my attorney: [ATTORNEY NAME, ADDRESS, PHONE]]. Sincerely, _______________________________ [YOUR NAME] Enclosures: - Medical records and bills (Exhibit A) - Proof of lost wages (Exhibit B) - Police report (Exhibit C) - Photos of injuries and vehicle damage (Exhibit D) - Correspondence with your company (Exhibit E) - Proof of at-fault driver's insurance status (Exhibit F) cc: [YOUR ATTORNEY, IF APPLICABLE] California Department of Insurance (if complaint filed)

💡 Tips for Using This Template

  • Customize all bracketed sections - Replace every [PLACEHOLDER] with your specific information
  • Attach all exhibits - Include copies of all documents referenced in the letter
  • Send via certified mail - This creates proof of delivery and receipt
  • Keep copies - Retain copies of everything you send for your records
  • Follow up in writing - If you call, follow up with a letter confirming the conversation

🚀 Next Steps

What to do after sending your UM/UIM demand letter.

Expected Timeline

Days 1-15

Insurer receives and acknowledges your demand letter; begins internal review

Days 15-30

Response expected: payment, improved settlement offer, or continued denial

Days 30+

If no satisfactory response, proceed to arbitration demand and/or bad faith litigation

If They Don't Pay or Respond Adequately

  1. Demand Arbitration

    Under Cal. Ins. Code 11580.2(i), you can demand binding arbitration for UM/UIM disputes over the amount of damages. Send a written arbitration demand to your insurer. The parties will select an arbitrator (or have one appointed) who will decide the value of your claim.

  2. Consult an Auto Accident / Insurance Attorney

    Many California attorneys handle UM/UIM cases on contingency (no fee unless you win). Given potential Brandt fee recovery and punitive damages in bad faith cases, strong claims are attractive to plaintiffs' attorneys. An attorney can handle arbitration and any bad faith litigation.

  3. File a Bad Faith Lawsuit

    If your insurer acted unreasonably, you can file a bad faith lawsuit in California Superior Court - separate from and in addition to arbitration. Bad faith claims allow recovery of Brandt fees, emotional distress, consequential damages, and punitive damages.

  4. File a Department of Insurance Complaint

    File a complaint at insurance.ca.gov. While this doesn't directly get you paid, it creates a regulatory record of the insurer's conduct and may prompt faster action on your claim.

⚠ Watch the Statute of Limitations

  • UM/UIM claims: 2 years from the date of the accident (CCP 335.1)
  • Bad faith claims: 2 years from the wrongful denial or conduct (CCP 339)

The arbitration demand must be made within the 2-year limitations period. Do not wait until the last minute - file your demand or lawsuit with time to spare.

Need Legal Help?

UM/UIM claims can involve complex arbitration procedures and bad faith litigation. Get a 30-minute strategy call with an insurance attorney to evaluate your case and discuss next steps.

Book Consultation - $125

California Resources

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