Form NF-10 New York No-Fault Denial: Arbitration and Master Appeal

An NF-10 is the New York no-fault denial of claim form your auto insurer sends when it refuses to pay some or all of your medical bills, lost wages, or other accident-related expenses. You have two ways to fight it: file for arbitration with the American Arbitration Association (a $40 filing fee, online or by mail), or sue in court. Arbitration is the standard route, and the sooner you file, the sooner you get heard.

What the Form Tells You

The NF-10 is a two-part document. The insurer fills out the front. It shows whether the carrier is denying the whole claim or only part of it, separated into loss of earnings, health service benefits, and other necessary expenses.¹ Two pieces of information on that page matter most: the reason code, which tells you the argument the insurer is making, and the mailing date, which starts the clock on your options.

The form itself explains how to contest the denial — send a copy to the AAA with supporting documents, or file a lawsuit.¹ Keep the original and make copies. You’ll need one for your arbitration filing.

Why Carriers Deny No-Fault Claims

Most NF-10 denials fall into a handful of categories. Which one shows up on your form dictates how you build your response.

Late Notice or Late Proof of Claim

New York’s no-fault rules require written notice to the insurer “as soon as reasonably practicable, but in no event more than 30 days after the date of the accident,” unless there is a clear and reasonable justification for the delay. Proof of claim then follows: 45 days after services are rendered for medical bills, and 90 days after the loss is incurred for wage claims.² Miss any of these and the carrier has grounds to deny.

Missed IME or Examination Under Oath

The insurer can require you to see a doctor of its choosing and to sit for an examination under oath. Skipping either is a coverage problem: the carrier can deny the pending claim and any future claim from the same accident.³ For an EUO, the insurer must offer a second date within 10 calendar days if you miss the first. Only after you miss the rescheduled EUO can it deny.⁴ One protection: the insurer cannot claw back money it already paid before you missed the exam. If you had a real reason for not attending, such as hospitalization or a conflict the carrier refused to accommodate, that becomes the core of your arbitration case.

No Medical Necessity

Insurers routinely cut off ongoing treatment by claiming it’s no longer medically necessary. The usual pattern: the carrier sends you to an IME or has a peer reviewer read your records, that reviewer says further treatment won’t help, and the insurer issues an NF-10 stopping payment for particular services or providers.⁵ At arbitration these come down to competing medical evidence — the insurer’s reviewer against your treating physician.

Policy Issue Denials

Some denials argue there was no valid coverage at all: the policy had lapsed, the vehicle wasn’t on it, or the injury wasn’t from a covered motor vehicle incident. These are flagged with a separate set of reason codes and carry a different attorney fee schedule at arbitration, which matters if you’re hiring a lawyer.

Late Denial by the Insurer

Check the mailing date on your NF-10 against the day the insurer received your proof of claim. Under 11 NYCRR 65-3.8, the carrier has 30 calendar days to pay or deny.⁶ That obligation applies to every claim submission, even follow-up bills after an earlier IME-based cutoff.⁵ The denial must arrive on the NF-10 form, in duplicate.⁷ A late denial makes the claim overdue, triggers interest, and can bar the insurer from raising certain defenses. Flag that timing prominently if it applies.

Filing for Arbitration

Arbitration through the AAA is the standard path. The carrier is required to participate; it can’t opt out.

Gather Everything First

The rules on adding documents later are strict. You must submit all supporting documents with your original request. After that, you generally can’t add anything except bills for ongoing treatment.⁸ Your packet should include:

A copy of the NF-10 showing the reason code and mailing date.
The full medical records for the dates of service in dispute.
A letter of medical necessity from your treating physician tying the disputed treatment to the accident.
Proof you filed your original claim on time — postmark receipts, certified mail tracking, or equivalent.
Copies of the bills in dispute (the NF-3 verification of treatment forms or other billing records).

Mail a complete copy of your submission to the insurer as well. If a medical provider is filing as your assignee, include a signed Assignment of Benefits form.⁸

Submit It

Two options, same $40 fee:

Online through the New York Insurance ADR Center at nysinsurance.adr.org. Use the electronic AAA Form AR1 and upload your documents. A successful submission generates a case number immediately.⁸
By mail, sending the completed AR1, a copy of the NF-10, all supporting documents, and a $40 check or money order payable to the American Arbitration Association to: American Arbitration Association, New York Insurance Case Management Center, 32 Old Slip, 33rd Floor, New York, NY 10005.⁹

File sooner rather than later. If your request reaches the AAA within 90 days of the denial, the hearing must be scheduled within 45 days after the case leaves conciliation.¹⁰

What Happens After You File

Every case goes through conciliation first. The insurer gets a chance to settle after seeing what you filed. A lot of disputes end here, with the carrier reversing course and paying part or all of the claim.

If conciliation doesn’t resolve it, the case moves to a hearing. For disputes under $2,000, the arbitrator can decide on the papers alone.¹⁰ Larger disputes get a hearing where both sides present evidence. The arbitrator’s decision is binding. Win, and the insurer owes the awarded amount plus interest.

Interest on Overdue Benefits

Any no-fault benefit the insurer failed to pay within 30 days of complete proof of claim accrues interest at 2 percent per month, calculated pro-rata on a 30-day month.¹¹ That’s 24 percent annualized, and it is meant to sting. On a claim that’s been sitting for a year or two by the time you win, the interest can be a meaningful chunk of the award. The clock starts when the carrier has a complete proof of claim, including any verification it properly requested.⁶

Attorney Fees

If you hire a lawyer and win, the insurer pays the fee in most cases. The formula depends on the kind of dispute:¹²

Standard benefit disputes such as medical necessity or late payment: 20 percent of total benefits plus interest, capped at $1,360 per proceeding.
Policy issue disputes: up to $70 per hour, capped at $1,400, plus up to $80 per hour for each hearing appearance.
Claims that settle during conciliation: same 20 percent formula, capped at $1,360.

When a case involves both a policy issue and a standard benefit question, the attorney gets whichever formula produces the higher fee. Arbitrators can go above the caps in unusually complex cases, but only with a written explanation.¹² The insurer owes no fee if the claim wasn’t denied or overdue when arbitration was filed, so filing while the carrier is still within its 30-day window doesn’t trigger a fee award.

Appealing to a Master Arbitrator

Losing at arbitration isn’t the end. Either side can appeal to a master arbitrator, but the window is short: 21 calendar days from the date the award was mailed.¹³ A claimant’s filing fee is $75; insurers pay $325. No fee, no appeal.

The grounds for reversal are limited:

Standard vacatur grounds under CPLR Article 75, meaning corruption, bias, or arbitrator misconduct.
An award that exceeded policy limits for basic or additional no-fault benefits.
An award that was incorrect as a matter of law. This is the most common ground, but it reaches only legal errors, not factual or procedural ones.
An attorney fee award that violated the fee schedule.

Insurers face an extra requirement: before their appeal is reviewed, they must pay any part of the award they aren’t contesting.¹³ After master arbitration, either side can go to court under CPLR Article 75, though the bar for overturning an arbitration award there is high.

If You Have Medicare

Medicare beneficiaries should know that no-fault pays first and Medicare pays second under federal Medicare Secondary Payer rules. When a no-fault insurer denies, Medicare may make a conditional payment for the medical costs while the dispute plays out. If you later win at arbitration and the insurer pays, Medicare is entitled to be reimbursed for what it fronted. Contact the Benefits Coordination and Recovery Center so those conditional payments are tracked and you aren’t surprised by a repayment demand after the case resolves.¹⁴

1
New York State Department of Financial Services. NF-10 New York No-Fault Denial of Claim Form
2
Legal Information Institute. New York Comp. Codes R. and Regs. Tit. 11 65-1.1 – Requirements for Minimum Benefit Insurance Policies
3
New York Courts. Failure to Attend a No-Fault IME
4
New York Department of Financial Services. OGC Opinion No. 06-12-16 – No-Fault Examination Under Oath
5
New York Department of Financial Services. OGC Opinion No. 04-09-03 – No-Fault Denials
6
Legal Information Institute. New York Comp. Codes R. and Regs. Tit. 11 65-3.8 – Payment or Denial of Claim
7
New York Codes, Rules and Regulations. 11 CRR-NY 65-3.8 – Payment or Denial of Claim
8
New York Department of Financial Services. File for No Fault Arbitration
9
American Arbitration Association. New York Motor Vehicle No-Fault Insurance Law Arbitration Request Form
10
Legal Information Institute. New York Comp. Codes R. and Regs. Tit. 11 65-4.5 – No-Fault Arbitration Procedure
11
New York Department of Financial Services. OGC Opinion No. 06-06-03 – Interest Payments on No-Fault Claims
12
Legal Information Institute. New York Comp. Codes R. and Regs. Tit. 11 65-4.6 – Attorney Fees
13
New York Codes, Rules and Regulations. 11 CRR-NY 65-4.10 – Master Arbitration
14
Centers for Medicare and Medicaid Services. Medicare Secondary Payer