Dental Insurance Coverage for Fillings: What Plans Pay and What You Owe
Most dental insurance covers fillings at 70-80% after your annual deductible. For a $200 composite filling with a $50 deductible already met, you pay about $40-$60 out of pocket.
The 100/80/50 System
Most dental insurance plans use a tiered coverage structure. Preventive care gets the highest coverage, basic restorative (including fillings) gets moderate coverage, and major restorative (crowns, bridges) gets the lowest. Some plans use 100/70/50 instead.
100%
Preventive
Cleanings, exams, X-rays, fluoride treatments. Usually no deductible applies.
80%
Basic Restorative
Fillings, simple extractions, root canals on front teeth. Your filling falls here. Deductible applies.
50%
Major Restorative
Crowns, inlays, onlays, bridges, dentures. Deductible applies. Often has a waiting period.
Deductibles and Annual Maximums
Annual Deductible: $50-$200
The amount you pay out of pocket each year before insurance starts covering. Most dental plans have a $50 deductible, though some go up to $200. The deductible typically applies to basic and major restorative services but not preventive care.
If your deductible is $50 and your filling is the first non-preventive procedure of the year, you pay the first $50, then insurance covers its percentage of the remainder.
Annual Maximum: $1,000-$2,000
The total amount your insurance will pay in a calendar year. Once you hit this cap, you pay 100% of any remaining treatment. The average annual maximum is $1,500, though basic plans may cap at $1,000 and premium plans at $2,000 or more.
Timing strategy: If you need multiple fillings, schedule some in December and the rest in January. This splits costs across two calendar years, giving you two annual maximums to work with.
The Composite Downgrade Clause
Many dental plans have a "composite downgrade" or "alternative benefit" clause. When you choose a composite (tooth-coloured) filling for a back tooth, the plan only pays what it would have paid for an amalgam filling. You pay the difference plus your normal co-insurance.
Worked Example: 2-Surface Molar Composite
Without the downgrade clause, you would pay 20% of $280 = $56. The downgrade nearly triples your cost.
Not all plans have this clause. Ask your insurer: "Does my plan have a composite downgrade or alternative benefit clause for posterior composite fillings?" Plans without this clause are significantly better for patients who want tooth-coloured fillings on back teeth.
Waiting Periods
| Category | Typical Wait | Coverage |
|---|---|---|
| Preventive (cleanings, exams) | None | 100% |
| Basic restorative (fillings) | 0-6 months | 70-80% |
| Major restorative (crowns, inlays) | 6-12 months | 50% |
| Orthodontics (braces) | 12-24 months | 50% |
If you just enrolled in a dental plan and need a filling right away, check the waiting period. Some plans have no waiting period for fillings; others require 3 to 6 months of membership. Employer-sponsored plans typically have shorter or no waiting periods compared to individual plans.
In-Network vs Out-of-Network
In-Network Dentist
Has agreed to the insurance company's fee schedule. The dentist accepts the "UCR" (usual, customary, and reasonable) rate as full payment. You pay only your co-insurance percentage of this negotiated rate. No balance billing. This is almost always cheaper.
Out-of-Network Dentist
Charges their own rates, which may exceed the insurance company's UCR rate. The plan pays its percentage of the UCR rate, and you pay the difference (balance billing) plus your co-insurance. A $300 composite filling might have a UCR rate of $220, so you pay $300 - (80% of $220) = $124.
How to Read Your EOB
After your filling, your insurance company sends an Explanation of Benefits (EOB). Here is what each line means:
If you used an in-network dentist, they write off the difference between their charge and the plan's allowed amount. Out-of-network dentists can bill you for this difference.
What to Do If Your Claim Is Denied
1. Read the denial reason carefully. Common reasons include: waiting period not met, procedure not covered under your plan, annual maximum already reached, or missing pre-authorization.
2. Call your insurance company. Ask for a detailed explanation. Sometimes denials are due to coding errors. Your dentist's office can resubmit with corrected codes.
3. Request a pre-authorization for future work. Before scheduling treatment, ask your dentist to submit a pre-determination to your insurance. The insurer reviews the proposed treatment and tells you in advance what they will and will not cover.
4. File an appeal if needed. You have the right to appeal any denial. Include your dentist's notes, X-rays, and a letter explaining medical necessity. Appeals must usually be filed within 30 to 180 days of the denial.
5. Ask about the alternative benefit clause. If your composite filling was denied or reduced, it may be because the plan only covers the amalgam rate. Ask your dentist's office to resubmit requesting the alternative benefit.