How does dental coordination of benefits work with two plans?

Have you ever handed over two insurance cards at a dental visit and wondered which insurer the front desk would bill first? Coordination of benefits (COB) is what sorts that out. Your primary plan pays first, and your secondary plan may then help with the remaining covered cost. The plans cannot pay more than the cost of your care, and a second plan does not guarantee that every balance will be covered. 

What you will learn in this article: 

• When both plans include coordination rules, coverage through your own job or policy usually pays before coverage you have as a dependent. 

• For a child covered by both parents, the birthday rule often helps decide which plan pays first. 

• The secondary plan usually needs the primary plan’s explanation of benefits before processing the claim. 

• Plan rules, including one called nonduplication, can limit how much the secondary plan pays.    

If you are unsure how your two dental plans work together, schedule an appointment with an Aspen Dental provider. Your care team can review your plan information and help you understand what to ask your insurers before treatment begins. 

What is dental coordination of benefits? 

Coordination of Benefits (COB) is the process two dental plans use when the same person has coverage under both. It decides which plan pays first and helps prevent duplicate payments for the same care. The American Dental Association notes that plan terms and state rules can affect how the benefits are coordinated.¹ 

COB does not guarantee that the two plans will pay your full bill. Each plan still applies its own coverage rules and limits. 

Which plan pays first? 

One plan is primary. It reviews and pays the claim first. The other plan is secondary and reviews the claim afterward. 

When both plans include COB rules, coverage through your own job or policy is generally primary. Coverage you have through someone else, such as a spouse, is generally secondary.¹ 

What is the birthday rule? 

For a child covered by both parents’ plans, many plans use the birthday rule. The plan belonging to the parent whose birthday falls earlier in the calendar year is usually primary. State rules may change the order, and a court order may take priority when parents are separated or divorced. Confirm the order with both plans before care begins.¹ 

How does the secondary plan pay its share? 

The secondary plan usually waits until the primary claim has been processed. It often needs the primary plan’s Explanation of Benefits, or EOB, which shows how that plan handled the claim.¹ 

After receiving the EOB, the secondary plan reviews the claim under its own coverage and COB rules. It may pay part of the remaining covered cost, but it may also pay less or nothing. Your results depend on the terms of both plans. 

Can coordination of benefits increase your savings? 

Sometimes, but the amount depends on how your plans coordinate. The process generally works like this: 

• Your primary plan processes the claim first. 

• Your secondary plan reviews the primary plan’s EOB. 

• The secondary plan applies its own benefits, limits and COB rules. 

• The combined payment cannot be more than the cost of the care. 

Under a traditional coordination arrangement, your two plans combined can pay for the entire eligible cost of your care. However, some secondary plans use a nonduplication rule. Under this rule, the secondary plan may pay nothing if the primary plan already paid as much as the secondary plan would have paid on its own.² 

What should you do before your dental visit? 

Bring both insurance cards to your appointment and tell the front desk that you have two plans. This gives the office the information needed to submit claims in the proper order. 

Call each plan before your visit and ask: 

• Which plan is primary and which is secondary? 

• Does the plan coordinate benefits with your other coverage? 

• Does the secondary plan use a nonduplication rule? 

• What paperwork will the secondary plan need? 

If one plan has already processed a recent claim, keep a copy of the EOB. The secondary plan may need it before reviewing its part of the claim. 

For planned care, ask your dental provider’s office for a cost estimate and ask both plans how they may cover the treatment. Two plans may reduce your cost, but they do not guarantee full coverage.  

Managing two plans can feel confusing, especially when paperwork delays a claim. Reach out to your dental provider to review your plan information and gather the details your insurers may need. 

How does dental coordination of benefits work with two plans? FAQs 

Still have questions about coordination of benefits? These answers cover a few common concerns. 

Can I just skip insurance and pay out of pocket for cleanings? 

Yes, some people choose to pay out of pocket when their expected routine costs are lower than the plan’s total cost. Before dropping coverage, decide how you would handle an unexpected bill and compare the plan’s network rates, annual maximum and other limits. A clean dental history does not guarantee that you will not need care. 

What happens if I switch plans in the middle of the year? 

Do not assume your old deductible, annual maximum or waiting period will carry over. The new plan has its own effective date and rules. Ask both insurers when the old coverage ends, when the new coverage begins and how work already started will be handled. 

Does insurance cover everything at the dental provider? 

No. Plans may include deductibles, copays or coinsurance, exclusions, service limits and an annual maximum. Your insurer can confirm your coverage, and your dental office can provide an estimate for your care. 

Do waiting periods apply to preventive care? 

Sometimes. Preventive care may begin right away under one plan but not another. Check the effective date, waiting periods, network rules and how often each service is covered before scheduling. 

What should I ask before deciding on a plan? 

Ask about the full premium, deductible, annual maximum, coverage percentages, waiting periods, network, exclusions and service limits. Then compare those details with local prices and the care you expect to need. 

Sources 

¹ American Dental Association, Dental Insurance: “Dental Plans - Coordination of Benefits.” https://www.ada.org/resources/practice/dental-insurance/dental-plans-coordination-of-benefits 

² American Dental Association, Dental Insurance: “ADA Guidance on Coordination of Benefits.” https://www.ada.org/resources/practice/dental-insurance/ada-guidance-on-coordination-of-benefits