Coordination of benefits in Canada: claiming under your plan and your spouse's plan

When you and your spouse or common-law partner both have health or dental benefits in Canada, you can usually claim under both plans for the same expense, up to 100% of the eligible cost. This is called coordination of benefits (COB). Your own plan pays first; your spouse's plan then considers the rest. For dependent children, the plan of the parent whose birthday comes first in the calendar year (month and day, not year of birth) usually pays first. Canadian insurers follow coordination guidelines published by the Canadian Life and Health Insurance Association, so most plans apply the same order. Done well, two plans can cover most of a family's dental and drug costs; done badly, claims bounce between insurers or get refused.

This guide is part of the plan choice checklist guide. Figures are illustrative.

Who pays first

Person claiming	First payer	Second payer
You	Your own plan (as an employee or member)	Your spouse's plan, where you are a dependant
Your spouse	Your spouse's own plan	Your plan
Dependent child, parents together	Plan of the parent whose birthday comes first in the year	The other parent's plan
Dependent child, parents separated	Usually the plan of the parent with custody, then that parent's spouse, then the other parent, unless a court order or agreement says otherwise	As set by the guidelines
Someone with two plans of their own (two jobs)	Usually the plan from the full-time job before the part-time one, and the active employee plan before a retiree plan	The other plan

Example of the birthday rule: one parent born on 14 March 1985, the other on 2 February 1988. The 2 February birthday comes first in the calendar year, so that parent's plan is first for the children, regardless of who is older.

Worked example: a family dental claim

A child's dental visit costs $600. Parent A's plan (birthday in February) pays 80% of basic dental up to $1,500 a year. Parent B's plan pays 70% up to $1,000. Both plans recognize the full $600 under their fee guides.

Submit to Parent A's plan first. It pays 80% x $600 = $480.
Submit the remaining $120 to Parent B's plan, with Parent A's explanation of benefits. Parent B's plan would have paid 70% x $600 = $420 if it were first; as second payer it pays up to the remaining amount, so it pays $120.
Total reimbursed: $600. Out of pocket: $0.

As second payer, a plan generally pays the lesser of the amount still owing and what it would have paid as first payer, subject to its own rules and maximums. The second plan's annual maximum is also reduced by what it pays.

Worked example: drugs with a pay-direct card

A spouse's monthly prescription costs $140. Their own plan's drug card pays 80% at the pharmacy, so they pay $28. They then submit the $28 receipt, with the pharmacy printout, to their partner's plan, which covers 90% of drugs. The second plan pays up to $28, subject to its own rules, so out of pocket falls to $0 to a few dollars. Some pharmacies can bill both plans at the counter; many cannot, so keep receipts.

When one plan is enough

Two plans are not always worth the premium. If you pay part of the cost for spousal coverage on your own plan, compare that payroll deduction with what the second plan actually adds:

In the dental example, Parent B's plan added $120. If adding family coverage costs Parent B $80 a month ($960 a year) and the family's yearly unreimbursed share under Parent A's plan alone is $700, keeping both plans costs $260 more than it saves.
Many flexible plans let you opt out of health and dental if you are covered under a spouse's plan, sometimes with a credit. Outside Quebec, this is common.
In Quebec, you can only opt out of the drug portion if you are covered by another private group plan, because drug insurance is mandatory; see Quebec's mandatory drug insurance.

Use the plan comparison tool to test "one plan" versus "both plans" with your family's expenses.

How to claim smoothly

Give each insurer your spouse's plan details, so they know COB applies.
Claim with the first payer, wait for its statement, then send the statement and receipt to the second payer.
For children, record both parents' birthdays and which plan is first.
Track deadlines: most plans require claims within a set time after the service, often 12 months or by a date after the plan year ends.
Keep copies. Unreimbursed amounts after both plans count toward the medical expense tax credit.

Public programs and coordination

A provincial drug program is usually the payer of last resort, except where a program is first-dollar coverage, such as provincial pharmacare for listed contraceptives and diabetes drugs in provinces that have launched it; see national pharmacare in 2026.
Having any private dental plan, including as a dependant on a spouse's plan, makes you ineligible for the Canadian Dental Care Plan.

Mistakes to avoid

Claiming with the wrong plan first, which delays both claims.
Using the older parent's plan for children instead of applying the birthday rule.
Not telling the insurer about other coverage, which can lead to recovery of overpaid amounts.
Paying for spousal coverage that rarely adds anything.

Frequently asked questions

Can I get more than 100% back with two plans?

No. Coordination limits the total to the eligible expense.

What if my spouse's plan is a health spending account?

An HSA can usually reimburse what is left after your insured plans, within the HSA's balance.

Do separated parents follow the birthday rule?

Not usually. The guidelines look at custody and court orders first. Tell both insurers about the arrangement.

Sources

Canadian Life and Health Insurance Association — coordination of benefits guidelines
OmbudService for Life and Health Insurance — disputes about claims
Régie de l'assurance maladie du Québec — opting out of group drug coverage in Quebec
Canadian Dental Care Plan on Canada.ca — access to dental coverage rule