Appeal letter: dental claim filed too late

An appeal letter template for a dental claim denied for timely filing when the claim was sent on time or was delayed by the insurer.

Updated November 11, 2026

The denial

The plan denied the claim because it arrived after the plan's filing deadline.

Why plans deny it

The first claim was lost, or rejected for a fixable error, and the corrected one came in late.
The claim went to the wrong insurer or wrong payer ID first.
Another plan paid first, and its explanation of benefits came late.

Is it worth appealing?

Worth appealing when you can prove the first claim went in on time, or that the delay wasn't yours. Without proof, these rarely succeed.

What to send with the letter

Proof the first claim went in on time: the clearinghouse acceptance report or mail receipt
The first rejection notice, if there was one
The other plan's explanation of benefits with its date, if it was secondary
A copy of the explanation of benefits

The letter

Paste it into your own letterhead and fill in the [brackets]. This page has no fields: nothing about the patient is typed here.

[Office name] [Office address] [Office phone] | [Office email] [Date] [Insurer name], Appeals [Insurer appeals address or fax] Re: Appeal of claim [claim number] Patient: [patient name] | Member ID: [member ID] | Date of birth: [date of birth] Subscriber: [subscriber name] | Group: [group number] Date of service: [date of service] | Procedure: [code] [service], date of service [date] Dear Appeals Reviewer, We are writing to appeal the decision on the claim above, on behalf of our patient [patient name]. The plan denied this claim as filed late. We first sent it on [date], within the plan's filing limit, as the enclosed [clearinghouse report / receipt] shows. [It was rejected on [date] for [reason], which we corrected and resent on [date]. / The primary plan's explanation of benefits is dated [date], and we filed with this plan [number] days later.] The delay was not caused by a late first filing. Please review the enclosed records and reprocess the claim for payment under the patient's benefits. If you need anything else, call [contact name] at [phone]. Sincerely, [Dentist name], [DDS or DMD] NPI [NPI number] Enclosures: proof of first filing, rejection notice, explanation of benefits

Before you send it

Send it before the deadline. The denial notice has to say how long you have and how to appeal. Employer plans that follow federal benefit claim rules give at least 180 days.
Send it to the appeals address or fax on the explanation of benefits, not the claims address.
The patient, or someone they authorize, has the right to appeal. Offices often send it for the patient; some insurers first ask for the patient's signed authorization form.
Keep a copy of everything you send and the date you sent it. If the appeal is denied, the plan has to explain why in writing.

A starting point, not legal advice. The plan's documents and the insurer decide what's paid.

CDT is a registered trademark of the American Dental Association. Tabruns is not affiliated with or endorsed by the ADA. The descriptions here are our own plain-English summaries, not the ADA's official wording; use your current CDT manual or practice software for the official code set.

Sources

Read November 11, 2026. Where a source describes one insurer's plans, we say so.

Get the patient's share in dollars, from the benefits page

Most of these denials can be seen coming from the benefits page. Tabruns reads the coverage, deductible, yearly maximum, waiting periods and frequency limits from the insurer's portal and works out what the patient owes. Patient details stay on the office computer.

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