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A Guide to Uninsured & Underinsured Motorist (SUM) Claims in New York

Home  >  Blog  >  A Guide to Uninsured & Underinsured Motorist (SUM) Claims in New York

December 12, 2025 | By Hach & Rose, LLP
A Guide to Uninsured & Underinsured Motorist (SUM) Claims in New York

New York SUM coverage is one of the most important but least understood parts of an auto insurance policy. When another driver causes an accident but has no insurance or not enough insurance to cover your injuries, you may feel stuck. The good news is that your own insurance policy may include coverage designed for exactly this situation. This coverage, called Supplemental Uninsured/Underinsured Motorist (SUM) coverage, may provide compensation when the at-fault driver cannot. You usually have this only if you chose it when you bought your policy or did not sign a form turning it down.

Many accident victims learn about SUM coverage only after discovering that the person who hit them has minimal or no insurance. This situation creates understandable frustration and concern about medical bills, lost wages, and other expenses. But the absence of adequate insurance on the other driver's policy does not mean you have no options. SUM coverage exists precisely to fill this gap, and New York law requires insurers to offer it to policyholders.

person in a suit reading legal papers at a desk with a gavel and a small toy car beside them

Key Takeaways for New York SUM Coverage Claims

  • New York law requires auto insurers to offer SUM coverage up to your liability limits, but you may choose lower SUM limits or turn it down altogether by signing a written waiver under Insurance Law § 3420(f)(2).
  • SUM coverage applies when the at-fault driver has no liability insurance (uninsured) or when their coverage is less than your SUM limits (underinsured).
  • SUM claims are separate from no-fault benefits. No-fault helps with medical bills and some lost wages, while SUM may cover injury losses that go beyond no-fault and the at-fault driver's policy, including pain and suffering, up to your SUM limits.
  • In many New York policies, SUM disputes are decided in arbitration instead of in court, because the policy language calls for arbitration.
  • Your own insurance company handles SUM claims, which creates a different dynamic than claims against another driver's insurer.

What SUM Coverage Actually Means

SUM stands for Supplemental Uninsured/Underinsured Motorist coverage. This coverage is part of your own auto insurance policy and protects you when the driver who caused your accident either has no insurance or does not have enough insurance to cover your damages.

The word "supplemental" is important. SUM coverage supplements other available coverage. It does not replace the at-fault driver's insurance but rather fills the gap when that insurance is missing or insufficient.

Uninsured Motorist Coverage

Uninsured motorist coverage applies when the driver who hit you has no liability insurance at all. Despite New York's mandatory insurance laws, some drivers still operate vehicles without coverage. A significant percentage of drivers nationwide lack insurance, and New York is no exception.

Hit-and-run accidents also typically fall under uninsured motorist coverage. When a driver flees the scene and cannot be identified, your SUM coverage may treat the accident as an uninsured motorist claim. Specific rules apply to hit-and-run claims, including reporting the accident to the police very quickly, often within 24 hours, and then notifying your insurance company as soon as you can.

Underinsured Motorist Coverage

Underinsured motorist coverage applies when the at-fault driver has insurance, but their policy limits are lower than your damages. For example, if the other driver carries only $25,000 in liability coverage but your injuries result in $100,000 in damages, their insurance falls short.

In this situation, your underinsured motorist coverage may pay the difference between what the other driver's insurance covers and your SUM limit. This coverage becomes especially valuable in serious injury cases where damages exceed typical minimum policy limits.

How SUM Coverage Differs From No-Fault Benefits

New York operates under a no-fault insurance system, which sometimes confuses accident victims about how SUM coverage fits into the picture. These two types of coverage serve different purposes and cover different types of losses.

No-fault benefits, also called Personal Injury Protection (PIP), cover your medical expenses and a portion of lost wages regardless of who caused the accident. Under Insurance Law § 5102, basic no-fault benefits provide up to $50,000 for these economic losses. You receive these benefits from your own insurer without proving the other driver was at fault.

What No-Fault Does Not Cover

No-fault benefits do not cover pain and suffering, emotional distress, or other non-economic damages. They also do not cover economic losses that exceed the policy limits. To recover these additional damages, you must step outside the no-fault system by meeting the serious injury threshold.

Where SUM Coverage Comes In

SUM coverage addresses the damages that no-fault does not cover. Once you meet the serious injury threshold, you may pursue a claim for pain and suffering against the at-fault driver. If that driver is uninsured or underinsured, your SUM coverage becomes the source of this compensation.

Think of it this way: no-fault pays your bills up to its limits, and SUM coverage pays for the additional harm you suffered when the at-fault driver lacks adequate insurance.

When You May File a SUM Claim in New York

SUM claims arise in specific circumstances. Not every accident that involves an uninsured or underinsured driver automatically triggers SUM coverage. Several conditions must typically be met before a SUM claim proceeds.

The following situations commonly give rise to SUM claims in New York:

  • The at-fault driver has no liability insurance whatsoever
  • The at-fault driver's liability limits are lower than your SUM coverage limits
  • A hit-and-run driver injured you and cannot be identified despite reasonable efforts
  • The at-fault driver's insurer becomes insolvent and cannot pay claims
  • You were a pedestrian or cyclist hit by an uninsured or underinsured vehicle

Each situation involves specific requirements and procedures. The common thread is that the at-fault driver's insurance, if any, is insufficient to compensate you for your injuries.

The Underinsured Trigger

For an underinsured motorist claim to kick in, the other driver's bodily injury limits have to be lower than your SUM limits. If their limits are the same as yours, there usually is no underinsured claim. Your SUM is meant to give you higher protection, not just duplicate the same limit.

This means the amount of SUM coverage you purchase matters significantly. Higher SUM limits provide more protection when another driver's coverage falls short.

The SUM Claim Process in New York

Filing a SUM claim differs from filing a claim against another driver's insurance company. Because you are making a claim on your own policy, the process follows specific steps outlined in that policy. Car accident attorneys in New York City who handle these claims understand the procedures and timing requirements involved.

Notice Requirements

Most SUM policies require you to notify your insurance company promptly after an accident that may give rise to a SUM claim. The specific deadline varies by policy, but waiting too long to provide notice may jeopardize your claim.

Your insurer also needs to know about any settlement discussions with the at-fault driver's insurance company. Before accepting a settlement from the other driver's insurer in an underinsured motorist situation, you typically must get your own insurer's consent. Settling without consent may affect your SUM claim.

Investigation and Evaluation

Your insurance company investigates SUM claims just as another driver's insurer would investigate a liability claim against their policyholder. The insurer reviews medical records, assesses damages, and evaluates the strength of your claim.

This creates an unusual dynamic. Your own insurance company, which you pay premiums to, now evaluates and potentially disputes your claim. The interests that normally align when you file a claim for property damage become adversarial when significant injury compensation is at stake.

How SUM Arbitration Works in New York

Many New York SUM policies require disputes to be resolved through arbitration rather than in court. Arbitration is a private process where a neutral third party, the arbitrator, hears evidence and decides the outcome. This process differs significantly from a jury trial.

The arbitration requirement appears in the policy language and reflects a common approach to resolving SUM disputes. While arbitration may resolve claims faster than litigation, it also involves trade-offs that affect how cases proceed.

The Arbitration Process

SUM arbitration in New York typically follows rules established by organizations like the American Arbitration Association. The process includes the following general steps:

  • Filing a demand for arbitration with the designated organization
  • Selection of an arbitrator who is acceptable to both parties
  • Exchange of relevant documents and information
  • A hearing where both sides present evidence and arguments
  • The arbitrator's decision, called an award

The arbitrator's award is generally binding, meaning both parties must accept it. Limited grounds exist for appealing an arbitration award in court.

Differences From Court Proceedings

Arbitration lacks some features of traditional litigation. There is no jury. Discovery, the formal process of exchanging information before trial, may be more limited. The rules of evidence may be more relaxed.

These differences affect case strategy and outcomes. Some claims may fare better in arbitration, while others might benefit from a jury trial if that option were available. The policy language typically controls which forum applies.

Common Challenges in SUM Claims

SUM claims involve challenges that differ from standard third-party injury claims. Because you are dealing with your own insurer, certain tensions arise that require careful navigation.

Disputes Over Coverage

Insurance companies sometimes dispute whether SUM coverage applies at all. They may argue that the other driver was not actually uninsured, that notice requirements were not met, or that the policy exclusions bar coverage. These coverage disputes must be resolved before addressing the value of your claim.

Valuation Disagreements

Even when coverage clearly applies, insurers may dispute how much your claim is worth. They evaluate your injuries, review your medical treatment, and assess your damages just as any liability insurer would. Disagreements about claim value often lead to arbitration.

Offset and Setoff Issues

In underinsured motorist claims, whatever you collect from the at-fault driver's insurance is usually subtracted from what your SUM policy may pay. In simple terms, your SUM insurer pays the difference between the other driver's payment and your SUM limit, up to that SUM limit. Disputes sometimes arise about how these calculations work.

Why SUM Coverage Limits Matter

The amount of SUM coverage you carry directly affects your protection when accidents happen. Many drivers purchase the minimum required coverage without understanding what they are giving up. Higher SUM limits provide significantly more protection in serious accidents.

Choosing Coverage Amounts

When you purchase auto insurance, the insurer must offer SUM coverage equal to your liability limits. You may choose lower SUM limits or reject the coverage entirely in writing. Many drivers opt for lower coverage to reduce premiums without fully understanding the consequences.

The Cost-Benefit Calculation

Increasing SUM coverage often costs relatively little compared to the protection it provides. A driver with $25,000 in SUM coverage who suffers serious injuries in a crash with an uninsured driver faces a significant gap. The same driver with $250,000 in SUM coverage has substantially more protection for a modest increase in premium.

The New York Department of Financial Services provides resources about auto insurance coverage options. Reviewing your policy periodically helps you understand what protection you actually have.

FAQ for New York SUM Coverage Claims

What If I Was a Passenger in Someone Else's Car?

Passengers injured by uninsured or underinsured drivers may have access to multiple SUM policies. The vehicle owner's policy may provide coverage, and you may also have coverage under your own auto policy or a policy in your household. The order in which these policies apply depends on their specific terms.

Does SUM Coverage Apply If I Was Hit While Walking or Biking?

Pedestrians and cyclists hit by uninsured or underinsured drivers may file SUM claims under their own auto policies or policies in their household. You do not need to be in a car to access SUM coverage. The policy language determines exactly how this coverage works for non-occupants.

What Happens If the At-Fault Driver's Insurance Company Goes Bankrupt?

If the at-fault driver's insurer becomes insolvent and cannot pay claims, your uninsured motorist coverage may apply. The situation essentially becomes an uninsured motorist claim because no coverage is available from the other side. Specific policy language controls how this situation is handled.

Is There a Deadline to File a SUM Claim in New York?

SUM policies contain time limits for providing notice and filing arbitration demands. These deadlines vary by policy and are separate from the general statute of limitations for personal injury claims. Missing a policy deadline may result in losing your right to pursue the SUM claim entirely.

What If My Insurer Denies My SUM Claim?

A denial does not necessarily end your claim. Insurers sometimes deny claims based on coverage interpretations that may be challenged. The reasons for denial matter, and options may exist to dispute the decision through arbitration or other proceedings, depending on the grounds for denial.

Protection You Already Paid For

SUM coverage represents protection you purchased for exactly this situation. When another driver causes an accident but lacks adequate insurance, your SUM coverage may provide the compensation that would otherwise be unavailable. Many accident victims do not realize this coverage exists until they need it.

At Hach & Rose, LLP, our attorneys have nearly 25 years of experience fighting for fair compensation for injured New Yorkers. We handle SUM claims regularly and understand the procedures, deadlines, and strategies that affect these cases. Our team works on a contingency fee basis, meaning we collect nothing unless we recover compensation for you.

If you were injured by an uninsured or underinsured driver, contact our office for a free consultation. A conversation about your coverage and your claim may reveal options you did not know you had.

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