Patient guide
My Dental Claim Was Denied as "Not Medically Necessary." Is That Final? No. If Your Plan Is Employer-Sponsored, You Have at Least 180 Days to Appeal.
A "not medically necessary" denial is one reviewer's opinion, not a final ruling. If your plan is through an employer, federal law (29 CFR 2560.503-1) gives you at least 180 days to appeal, a right to the reviewer's full file, and a decision within a set number of days. Here is how the clock and the file work.
Reviewed by the CheckMyDenial team, patient billing and appeals. Last reviewed: September 3, 2026.
Short answer: no, "not medically necessary" is not the end of it. That phrase is a reviewer's clinical opinion, measured against your specific plan's coverage rules, and it can be wrong or incomplete. If your dental coverage comes through an employer group plan, federal regulation 29 CFR 2560.503-1 gives you at least 180 days from the denial notice to appeal, a right to see the plan's internal rules and any expert opinion used against you, and a decision within a set number of days, usually 60 for a single-level appeal on a claim for services already received.
The words "not medically necessary" on a denial letter feel final because they are stated as fact. They are not fact. They are the output of a coverage rule applied by someone who did not examine you, working from a claim code and a chart note, not from your mouth. The plan's own regulation exists because that first pass is allowed to be wrong, and it builds in a process to check it.
What does an ERISA appeal deadline actually require?
If your dental benefit comes through work, coverage is very likely governed by the Employee Retirement Income Security Act, ERISA, and its claims procedure regulation at 29 CFR 2560.503-1. Subparagraph (h)(3)(i) sets the floor: the plan must "provide claimants at least 180 days following receipt of a notification of an adverse benefit determination within which to appeal the determination." That is a minimum, not a target. A plan can offer more time. It cannot offer less.
The clock starts when you receive the notice, not when the claim was processed. If your denial letter was delayed in the mail or sent to an old address, that delay works in your favor when you calculate the deadline, and it is worth stating in your appeal letter if it applies.
How long does the plan have to decide my appeal?
The regulation also sets the plan's side of the clock, in subparagraph (i). For a post-service claim, meaning treatment you already received, a plan running a single mandatory level of appeal must decide within 60 days of receiving your appeal, under (i)(2)(iii)(A). A plan that runs two mandatory levels of appeal gets 30 days per level instead. Urgent care claims move much faster, with a decision required within 72 hours under (i)(2)(i), but a completed dental procedure almost never qualifies as urgent under that definition.
Your original denial notice should state which structure your plan uses. If it does not say, ask in writing, because the number of appeal levels changes how long the whole process can legally take.
| Claim type | Appeal deadline for you | Plan's decision deadline |
|---|---|---|
| Any group health claim, dental included | At least 180 days from the denial notice | Not applicable, this is your window |
| Post-service claim, single appeal level | Within the 180-day window | 60 days from the plan's receipt of your appeal |
| Post-service claim, two appeal levels | Within the 180-day window, per level | 30 days per level |
| Pre-service claim, single or first appeal | Within the 180-day window | 15 days from the plan's receipt of your appeal |
| Urgent care claim | As soon as possible given the medical urgency | 72 hours from the plan's receipt of your appeal |
What is a "full and fair review," and what does it entitle you to?
The regulation does not just set deadlines. It defines what the plan owes you during the review. A claimant has to be given the reasonable opportunity to submit written comments, documents, and other information relevant to the claim, and the review has to take that new material into account, not just re-run the original decision. The reviewer on appeal has to be a different person than whoever made the initial denial, and cannot be that person's subordinate.
You are also entitled, on request and free of charge, to reasonable access to and copies of all documents, records, and other information relevant to your claim. That includes internal rules, guidelines, protocols, or similar criteria the plan relied on, and it includes the identity of any medical or dental expert whose advice was obtained in connection with your claim, whether or not the plan followed that advice. Most people never ask for this file. Asking for it, specifically, in writing, is one of the highest-leverage things you can do before you write the appeal itself, because it tells you exactly what standard the reviewer applied.
Why does the treating dentist's letter matter so much?
A denial coded as "not medically necessary" is almost always measured against a generic clinical criterion: is this procedure typically necessary for this diagnosis code, under this plan's policy. That is a population-level question. Your dentist can answer a different, narrower question: was this procedure necessary for this patient, given what the exam found, what alternatives were considered, and why they were rejected.
A strong letter from the treating dentist does three things a generic appeal letter cannot: it states the specific clinical findings that justified the procedure, it names the alternatives that were considered and explains why they would not have worked, and it directly addresses the plan's stated reason for denial rather than restating what the treatment was. Reviewers respond to specificity. A letter that only says "this treatment was necessary" without engaging the plan's actual objection tends to get a form response back.
What if the plan never answers, or answers late?
If a plan fails to establish or follow a claims procedure that meets the regulation's requirements, in a way that denies you a full and fair review, you are treated as having exhausted your administrative remedies under the plan, under 29 CFR 2560.503-1(l)(1). In plain terms, a plan that blows its own deadline or skips a required step cannot then argue you failed to complete its process. That protection exists specifically because plans are the ones writing and running the procedure, and the regulation does not let them benefit from getting it wrong.
This exhaustion rule is written for ERISA-governed plans. If your coverage is a government plan, a church plan, or falls outside ERISA for another reason, this specific protection may not apply the same way, and you should check what timeline and process your plan's own documents or your state insurance department describe instead.
What should the appeal itself say?
Three things, in order. First, name the specific plan provision the denial cited, and say directly why it does not apply to your situation, using the clinical facts your dentist can supply. Second, attach the treating dentist's letter, written to answer the plan's stated reason, not to restate the treatment. Third, request the plan's internal claim file, including any expert opinion used, either before you submit the appeal or as part of it, so the reviewer knows you have seen, or are about to see, exactly what standard was applied.
Send it by a method that gives you a delivery record, and keep a copy of everything, including the date you received the original denial notice, since that date is what starts your 180-day clock.
A note on who we are
CheckMyDenial helps patients read and appeal insurance denials. We are related to a company that does medical-dental billing and reimbursement for patients and practices, and if you ever move from reading to having someone handle a claim for you, that relationship and any fee are disclosed before anything is paid. This page is free, it does not require anything from you, and it will stay that way.
Where this comes from
The appeal deadline, the plan's decision deadline, the full-and-fair-review requirements, and the deemed-exhaustion rule are all drawn directly from 29 CFR 2560.503-1, the Department of Labor's claims procedure regulation for plans providing group health benefits, as published at law.cornell.edu, which mirrors the current eCFR text. Background on which plans ERISA covers comes from the Department of Labor's Employee Benefits Security Administration. Links are listed at the end of this page. If your plan is not employer-sponsored, the deadlines here may not apply to you; read your denial notice for the timeline your plan actually uses. If you find something here that is out of date, tell us and we will fix it and change the date at the top.
Questions people ask
My dental claim was denied as not medically necessary. Is that final?
No. It is one reviewer's clinical opinion, applied against your plan's own coverage rules. If your coverage is through an employer group plan, federal regulation gives you at least 180 days from the denial notice to appeal, and the plan has to give you a full and fair review by someone who was not involved in the first decision. Government plans and individual-market plans follow their own state-set timelines instead.
How many days do I have to appeal a dental denial?
For an employer-sponsored plan, the federal minimum is 180 days from the date you receive the adverse benefit determination notice, under 29 CFR 2560.503-1(h)(3)(i). Your plan can give you longer, never shorter. Government-sponsored dental plans, Medicaid managed care, and individual-market plans follow different deadlines set by the program or the state, so check the notice itself for the number that applies to you.
How long does the plan have to decide my appeal?
For a post-service dental claim under an ERISA plan with one level of appeal, the plan generally has 60 days from receiving your appeal to decide, under 29 CFR 2560.503-1(i)(2)(iii)(A). If the plan uses two mandatory appeal levels, each level gets 30 days. The notice you received when your claim was first denied should say which structure your plan uses.
What does the treating dentist's letter actually do in an appeal?
It reframes the clinical question. A denial usually applies a generic plan rule to a code, not to your mouth. A letter from the dentist who examined you, describing the specific findings, the alternatives considered, and why this treatment was necessary for this patient, forces the reviewer to answer that specific case instead of the generic one. Appeals with a treating-provider letter attached are treated differently from a one-line request to reconsider.
Can I see the reasons my claim was denied?
Yes. Under the same regulation, you are entitled to the specific reasons for the denial, the plan provision it relies on, and, on request, free copies of any internal rule, guideline, or protocol used to decide your claim, along with the identity of any expert consulted, even if their advice was not followed. Ask for the full claim file in writing.
What happens if the plan misses its own appeal deadline?
If a plan fails to follow the claims procedure regulation in a way that denies you a full and fair review, you are treated as having exhausted the plan's internal appeals, under 29 CFR 2560.503-1(l)(1). That matters because exhausting internal appeals is normally a required step before you can take a dispute further. A missed deadline can work in your favor procedurally, but confirm your plan type before relying on it, since the exhaustion rule is written for ERISA plans specifically.
Does it matter if my plan is through my employer or something I bought myself?
Yes, a great deal. The 180-day minimum and the full-and-fair-review rights described here come from ERISA, the federal law covering most employer group health plans. Government plans, church plans, and many individual or marketplace dental plans are not governed by this regulation, and instead follow rules set by the plan issuer or your state insurance department. Your denial notice should say which framework applies; if it does not, ask the plan directly.