How Much Does Fillings Cost With Insurance?
Quick Answer / Executive Summary
With a standard dental PPO plan, a filling classified as a "basic service" is typically reimbursed at 70-80% coinsurance after your deductible, leaving you owing roughly $30 to $80 per filling — compared to $150 to $400 with no coverage at all. See the complete cost comparison guide for how this compares to crowns and braces.
Key Takeaways at a Glance
- Fillings are almost always classified as "basic services," which get a higher coinsurance rate (70-80%) than "major services" like crowns (50-70%).
- Your out-of-pocket cost depends on whether you've already met your annual deductible, which is typically small ($25-$100) but still applies before coinsurance kicks in.
- Some plans reimburse composite (tooth-colored) fillings at a lower rate than amalgam fillings on back teeth — confirm your specific plan's material rule before treatment.
- Multiple fillings in one visit are billed per surface treated, so a filling covering two or three surfaces of the same tooth costs more than a single-surface filling.
Why Fillings Are Priced by Surface, Not Just by Tooth
Dental billing codes a filling by the number of surfaces of the tooth involved — one surface (a small cavity) is billed lower than two or three surfaces (a larger area of decay). Both insurance reimbursement and your out-of-pocket share scale with this surface count, so a bill for "two fillings" can mean very different things depending on how many surfaces each filling actually covers. Ask your dentist's office to show you the surface count on your treatment estimate so the insurance-adjusted number isn't a surprise.
Composite vs. Amalgam: Does Material Change Your Cost?
Composite (tooth-colored) fillings are now the default choice for most visible teeth, and most modern PPO plans reimburse them at the same rate as amalgam. Some older or lower-tier plans, however, still reimburse composite fillings on back molars at only the amalgam-equivalent rate, requiring you to pay the difference between the two materials out of pocket even though composite was used. Confirm this specific plan detail before choosing a material for a back tooth if cost is a deciding factor.
How the Deductible Interacts With Coinsurance
Most plans require you to meet a small annual deductible ($25-$100 is typical) before coinsurance applies to any basic service, including fillings. If it's your first dental visit of the plan year, the deductible is usually subtracted from the filling's allowed charge before the 70-80% coinsurance is calculated on the remainder — meaning your very first filling of the year often costs slightly more out of pocket than a filling later in the same plan year.
What You Should Do: Step-by-Step Action Plan
1
Ask for the surface count on your treatment estimate so you understand what's actually being billed.
2
Confirm whether your plan reimburses composite fillings on back teeth at the same rate as amalgam.
3
Check whether you've already met your annual deductible before your visit, since your first filling of the plan year may cost more out of pocket than later ones.
4
Request a pre-treatment estimate from your insurer for anything beyond a routine single-surface filling.
Critical Mistakes to Avoid
- Assuming a flat per-filling coinsurance number without accounting for surface count.
- Not confirming your plan's composite-vs-amalgam reimbursement rule before choosing a material for a back tooth.
- Forgetting that the deductible applies before coinsurance, which can make your first visit of the year cost more than later ones.
- Skipping a pre-treatment estimate for multiple fillings in one visit, which can add up faster than expected.