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Third Party Insurance Demand Letter Sample

A third party insurance demand letter is a formal written claim sent to the at-fault party's insurance carrier documenting liability, injuries, medical treatment, and total damages on behalf of your client. Unlike a first-party claim made to your client's own insurer, a third party demand establishes that the opposing insurer owes compensation based on their insured's negligent conduct.

Download the free sample and see exactly what a complete, well-documented third party insurance demand letter looks like, section by section.

Used by personal injury attorneys and plaintiff law firms nationwide.

Sample Third Party Insurance Demand Letter

The following is a professionally structured third party insurance demand letter sample based on a real-world motor vehicle collision scenario involving a hit-and-run. Customize all bracketed fields with your client's specific case details before sending. This sample is for reference only and requires attorney review and approval before use.
1

Letterhead & Parties

2

Introduction

3

Facts & Liability

4

Injury & Diagnosis

5

Medical Treatment

6

Medical Expenses

7

Pain, Property & Wages

8

Damages Summary

9

Policy Limits Demand

10

Signaure & Enclosure

Third Party Insurance Demand Letter — Sample Document
[Your Law Firm Name]
[Address]
[City, State, ZIP]
[Phone Number]
[Email Address]
[Date]
Sent via Certified Mail and Email: [Recipient Email]
[Recipient Name]
[Insurance Company or Opposing Party Name]
[Address]
[City, State, ZIP]
Ref: [Claim Number or File Reference]
TIME SENSITIVE — PRIVILEGED SETTLEMENT CORRESPONDENCE
RE:
Your Insured or Represented Party: [Defendant or Opposing Party Full Name]
Our Client: [Client Full Name]
Date of Loss or Incident: [Date]
Claim Number: [Claim Number]
Location:  [Full Address or Location of Incident]
Third Party Insurance Demand Letter — Sample Document
Dear [Adjuster or Representative Name]:

As you are aware, our office represents the interests of [Client Full Name] in connection with the below-described incident. On [Date of Loss], our client was traveling on [Roadway] when your insured, [Defendant Name], collided with her vehicle while attempting to turn into [Location]. Following the collision, [Defendant Name] left the scene.

This demand is a good faith attempt to resolve our client's claims against your insured and avoid unnecessary litigation. All statements made here are for settlement purposes only. Enclosed are medical records, bills, photographs, and all supporting documentation of liability and damages.
Third Party Insurance Demand Letter — Sample Document
FACTS AND LIABILITY

Summarize the clearest liability fact in one sentence before presenting the narrative. For example: "The police report confirms your insured failed to yield the right-of-way and left the scene." Let the evidence establish what is not in dispute — do not open with an unsupported assertion.

On [Date of Loss], our client was traveling [Direction] on [Roadway] when your insured, [Defendant Name], traveling in the opposite direction, failed to yield the right-of-way and collided with our client's vehicle while attempting to make a turn into [Location].

The impact of the collision was significant, causing substantial damage to our client's vehicle and resulting in the injuries documented below. Following the crash, [Defendant Name] left the scene, further compounding the harm and distress suffered by our client.

Your insured's conduct constitutes violations of multiple applicable statutes, including:
  • Failure to Yield Right-of-Way [applicable statute]
  • Leaving the Scene of a Collision Involving Injury [applicable statute]
  • [Additional applicable traffic violation and statute]

Confirm that hit-and-run statutes in your jurisdiction support a negligence per se theory before including the following language. In some states, negligence per se requires the statutory violation to be within the class of harms the statute was designed to prevent, and the analysis varies by jurisdiction. Do not include this assertion if your jurisdiction does not support it.

These violations establish negligence per se and direct liability for all resulting injuries and damages.

As a direct and proximate result of your insured's conduct, our client sustained the injuries and damages documented below.
Third Party Insurance Demand Letter — Sample Document
INJURY — 2.1 DIAGNOSIS SUMMARY
We have enclosed all pertinent medical records regarding our client's injuries. These injuries were suffered as a direct and proximate result of the incident described above. The following table provides a non-exhaustive summary of injuries sustained. All diagnoses are sourced from treating physician records enclosed herewith.
ICD Code
Injury / Diagnosis
S51.852A
Open bite of left forearm, initial encounter
S30.1XXA
Contusion of abdominal wall, initial encounter
S92.511A
Displaced fracture of proximal phalanx of right lesser toe, initial encounter for closed fracture
Third Party Insurance Demand Letter — Sample Document
2.2 MEDICAL TREATMENT
Provider 1 — Emergency Department or Initial Treatment
On [Date], our client presented to [Provider Name] with complaints of: [Symptoms as documented in the medical record]
Upon evaluation, the following findings were noted: [Summarize physician findings using the language from the medical record]
Treatment included: [Describe treatment rendered, medications prescribed, and procedures performed]
Recommendations: [List recommended follow-up care, specialist referrals, and ongoing treatment]
(See Exhibit: [Number], "[Provider Name] Medical Records and Bills")
Provider 2 — Specialist or Follow-Up Provider
On [Date], our client presented to [Provider Name] with complaints of: [Symptoms as documented in the medical record]
Upon evaluation, the following findings were noted: [Summarize physician findings using the language from the medical record]
Diagnostic studies included:
CT Scan: [Results]
MRI: [Results]
X-Ray: [Results]
Recommendations: [List recommended follow-up care, specialist referrals, and ongoing treatment]
(See Exhibit: [Number], "[Provider Name] Medical Records and Bills")
Provider 3 — Physical Therapy, Mental Health, or Additional Specialist
On [Date], our client presented to [Provider Name] with complaints of: [Symptoms as documented in the medical record]
Upon evaluation, the following findings were noted: [Summarize physician findings using the language from the medical record]
Treatment included: [Describe treatment rendered, medications prescribed, and procedures performed]
Recommendations: [List recommended follow-up care, specialist referrals, and ongoing treatment]
(See Exhibit: [Number], "[Provider Name] Medical Records and Bills")
Third Party Insurance Demand Letter — Sample Document
DAMAGES — 3.1 MEDICAL EXPENSES
Past Medical Expenses
To recover past medical expenses, the following must be established: the charges were reasonable, the treatment was medically necessary, and the treatment was causally related to the incident. We have enclosed copies of all medical bills. This list is not final, as additional treatment may be required given the continuing nature of our client's injuries.
Provider
Date of Service
Amount
[Provider Name]
[Date]
$[Amount]
[Provider Name]
[Date][Date range]
$[Amount]
TOTAL
$[Amount]
Future Medical Expenses

Each future expense listed below must be supported by a treating physician's recommendation, documented treatment plan, or expert opinion. Source each line item to the corresponding exhibit before sending. Third party insurers contest future medical expense projections more aggressively than primary insurers — unsupported projections will be challenged and may reduce claim value.

Procedure
Amount
Physical Therapy ([number] sessions)
$[Amount]
Orthopedic Follow-Up
$[Amount]
TOTAL
$[Amount]
Third Party Insurance Demand Letter — Sample Document
3.2 PAIN AND SUFFERING

Following this incident, our client has endured significant physical pain and emotional distress that has profoundly affected her daily life. The collision, compounded by the trauma of being left at the scene without assistance, resulted in substantial physical injury, emotional distress, anxiety, and loss of enjoyment of life.

Our client's injuries have limited her ability to:

  • Perform essential work functions
  • Engage in physical activity and exercise
  • Carry out household responsibilities
  • Participate in recreational activities
  • Maintain prior social and personal relationships

Pain and suffering in this matter encompasses not only the physical pain documented by treating providers but also the emotional distress, anxiety, humiliation, and lasting psychological impact directly caused by your insured's conduct.

Pain and Suffering Value: $[Amount]

3.3 PROPERTY DAMAGE

Our client's vehicle sustained substantial damage as a direct result of the collision.

Repair Estimate or Total Loss Value: $[Amount]

(See Exhibit [Number]: Wage Loss Documentation and Employer Verification)

3.4 LOSS OF EARNINGS

As a result of the injuries sustained in this incident, our client was unable to work for [number] weeks. Total lost earnings for this period amount to $[Amount].

(See Exhibit [Number]: Wage Loss Documentation and Employer Verification)

Third Party Insurance Demand Letter — Sample Document
3.5 SUMMARY OF DAMAGES
Damage Category
Amount
Past Medical Expenses
$[Amount]
Future Medical Expenses
$[Amount]
Pain and Suffering
$[Amount]
Property Damage
$[Amount]
Lost Wages
$[Amount]
TOTAL
$[Amount]
Third Party Insurance Demand Letter — Sample Document
DEMAND TO SETTLE

In an effort to amicably resolve this matter, our client has authorized us to accept $[Settlement Amount] as FULL AND FINAL SETTLEMENT OF ALL CLAIMS against your insured.

Liability in this matter is clear and not reasonably in dispute. Your insured's negligence, violation of applicable traffic statutes, and departure from the scene directly and proximately caused our client's injuries and all resulting damages.

Applicable statutes and case law establish liability and support full compensation for every category of damage documented above. Should this matter not be resolved, our firm is prepared to pursue all available legal remedies, including:

  • Litigation
  • [Include only if documented damages clearly exceed the available policy limits and this letter is structured as a policy limits demand: Excess exposure claims]
  • [Include only if the insurer's conduct in handling this claim supports a bad faith theory under applicable state law: Bad faith claims]
  • All additional statutory remedies available in this jurisdiction

Response Deadline

We expect a response no later than 5:00 P.M. on [Response Deadline Date]. Please provide this correspondence to all relevant decision-makers, claims personnel, and insurance representatives.

Thank you for your consideration. We look forward to your prompt response.

Third Party Insurance Demand Letter — Sample Document
[Attorney Name]
[Bar Number]
[Law Firm Name]
[Email]
[Phone]
Enclosures:
Exhibit 1: Police Report
Exhibit 2: EMS Records and Bills
Exhibit 3: [Provider 1] Medical Records
Exhibit 4: [Provider 1] Medical Bills
Exhibit 5: [Provider 2] Medical Records
Exhibit 6: [Provider 2] Medical Bills
Exhibit 7: [Provider 3] Medical Records
Exhibit 8: [Provider 3] Medical Bills
Exhibit 9: Radiology Records and Reports
Exhibit 10: Vehicle Damage Photographs
Exhibit 11: Injury Photographs
Exhibit 12: Wage Loss Documentation
DISCLAIMER

This third party insurance demand letter sample is provided for reference and educational purposes only. It does not constitute legal advice and should not be used as a final document without review and approval by a licensed attorney. Liability standards, negligence statutes, hit-and-run provisions, damages calculations, and procedural requirements vary by state and jurisdiction. All bracketed fields must be customized to reflect the specific facts, injuries, treatment history, and applicable statutes of your client's case. Law Practice AI makes no representations regarding the suitability of this sample for any particular case or jurisdiction.
All bracketed fields must be customized to reflect the specific facts, injuries, and circumstances of your client's case. Law Practice AI makes no representations regarding the suitability of this sample for any particular case or jurisdiction.
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Law Practice AI generates third party insurance demand letters directly from the medical records and case documentation your firm uploads.

Clinical language is sourced from the actual physician notes in your case file. Liability facts and statutory violations are structured from your uploaded case documents. Every draft is organized to establish that the at-fault party's insurer owes compensation for all documented damages.
Every draft requires attorney review and approval before it is sent.
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What Every Strong Third Party Insurance Demand Letter Must Include

A third party insurance demand letter establishes that the opposing insurer owes compensation based on their insured's negligent conduct. Every component must work together to document liability, causation, and damages clearly enough that the adjuster has no reasonable basis to dispute the claim. Here is what belongs in every letter.
Clear Third Party Liability Framing in the Opening
Precise Negligence and Statutory Violations
ICD-Coded Injury Documentation
Provider-by-Provider Medical Treatment Chronology
Medical Expenses Billing Table with Totals
Future Medical Expenses by Procedure
Pain and Suffering Narrative Tied to Documentation
Property Damage Documentation
Settlement Demand with Litigation Consequence Statement
Clear Third Party Liability Framing in the Opening
State immediately that the demand is being made against the at-fault party's insurer as a third party claim. Reference the insured by name, the date of loss, and the claim number. The opening paragraph establishes the legal relationship: your client is a third party claimant, not a first-party insured. This distinction is important because the insurer's obligations to a third party claimant differ from their obligations to their own policyholder.
Precise Negligence and Statutory Violations
Detail the specific negligent acts committed by the insured with reference to the applicable traffic statutes violated. Where the insured left the scene, cite the applicable hit-and-run statute specifically. Establishing negligence per se through statutory violations removes the insurer's ability to argue comparative fault in clear-liability cases.
ICD-Coded Injury Documentation
Every diagnosis must be documented with the corresponding ICD code sourced from the treating physician's notes. Clinical specificity demonstrates that the injuries are coded, verified, and sourced from medical records rather than self-reported complaints. Each injury should be traceable to a specific exhibit in the enclosures.
Provider-by-Provider Medical Treatment Chronology
Document every medical provider seen, every treatment received, and every date of service organized by provider in chronological order. Each provider section should include chief complaints, clinical findings, treatment rendered, and recommended follow-up care. Reference the corresponding exhibit for each provider. Gaps in the treatment timeline give adjusters room to dispute causation and severity.
Medical Expenses Billing Table with Totals
Present past medical expenses in a structured billing table showing facility name, dates of service, total billed, adjustments, and total due per provider. Include a totals row. The table format is immediately recognizable to adjusters and leaves no ambiguity about the documented financial losses.
Future Medical Expenses by Procedure
Document anticipated future medical expenses by procedure type with estimated costs per line item. Reference the treating physician's recommendations as the basis for each item. Future medical expenses are often contested by third party insurers treating physician documentation as essential to support each projected cost.
Pain and Suffering Narrative Tied to Documentation
Describe the non-economic impact of the injuries in specific, documented terms drawn from the treating physician and therapist notes. Address physical pain, emotional distress, functional limitations, loss of enjoyment of life, and any aggravating circumstances specific to the incident such as being left at the scene without assistance. Adjuster-ready pain and suffering narratives reference specific documented symptoms, not general statements.
Property Damage Documentation
Include a separate section for vehicle damage with the repair estimate or total loss value, supported by the insurance company's appraisal or repair shop documentation. Property damage is often handled separately from bodily injury by third party insurers. Documenting both in the same letter establishes the full scope of damages in a single correspondence.
Settlement Demand with Litigation Consequence Statement
State the total settlement amount clearly. Include a direct statement that failure to resolve this matter will result in litigation, excess exposure claims, and all available statutory remedies. The litigation consequence statement serves notice that the cost of non-resolution extends beyond the demand figure.

Frequently Asked Questions

What is a third party insurance demand letter?
What is the difference between a first party and third party insurance claim?
What is the difference between a regular time limit demand and a policy limits demand?
How long does a third party insurance company have to respond to a demand letter?
What should you do if the third party insurer denies the claim?
Can a third party insurer access my client's medical records?
What happens when the at-fault driver leaves the scene?

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