Coordination of Benefits

When You Have Multiple Insurance

If you're covered by more than one health insurance plan, coordination of benefits (COB) determines how the plans work together to pay for your care.

Common Dual Coverage Situations

How You Might Have Multiple Plans

• Covered by your own employer plan plus spouse's plan
• Medicare plus employer coverage
• Medicare plus Medicaid
• Parent's plan plus your own (under age 26)
• COBRA plus new employer plan

Why It Matters

• Potentially more coverage
• Lower out-of-pocket costs
• But claims processing is more complex
• Must follow COB rules

Primary vs Secondary Insurance

Primary Insurance

The plan that pays first:

• Receives and processes claims initially
• Pays according to its normal rules
• Sends EOB showing what it paid

Secondary Insurance

The plan that pays second:

• Receives claim after primary pays
• May cover some or all of what primary didn't
• Has its own rules about secondary payments

Tertiary Insurance

If you have three plans (rare):

• Pays after primary and secondary
• Same concept, third in line

How Primary is Determined

Standard Rules (Order of Priority)

For You:

1. Your own employer coverage (if you work)
2. Your spouse's coverage (if added to their plan)
3. Other coverage

For Children:
The "Birthday Rule" commonly applies:

• Parent whose birthday comes first in the calendar year is primary
• Not older parent - just earlier month/day
• Example: Parent A born March 15, Parent B born August 20 → Parent A is primary

For Medicare:

• Working and over 65 with employer coverage: Employer is usually primary
• Retired: Medicare is usually primary
• ESRD: Special rules apply

When Rules Don't Apply

If standard rules don't determine:

• Plan covering person longest may be primary
• Plans may split 50/50
• State laws may apply

How Claims Are Processed

Step-by-Step Process

1. You receive medical care
2. Claim goes to primary insurance first
3. Primary processes and pays (or denies)
4. Primary sends EOB showing payment
5. Claim (with primary's EOB) goes to secondary
6. Secondary processes based on primary's payment
7. Secondary may pay some or all of remainder

Example Claim

Service: $500 office visit

Primary Insurance Processes:

• Allowed amount: $400
• Deductible: $100
• Pays 80%: $240
• Your responsibility after primary: $160

Secondary Insurance Processes:

• Reviews primary's payment
• May pay some/all of your $160
• Result varies by plan

What Secondary Might Pay

Secondary payment depends on plan rules:

• May pay up to what it would have paid as primary
• May cover remaining patient responsibility
• May have its own deductible requirements
• Won't pay more than the service cost total

Common COB Issues

Delayed Claims

• Secondary must wait for primary's EOB
• Can cause billing delays
• Set up notifications from both insurers

Incorrect Primary Designation

• Claims denied if wrong order
• Must correct with insurers
• May need to resubmit claims

Information Requests

Both insurers may ask about other coverage:

• Answer COB questionnaires promptly
• Update coverage changes
• Failing to respond can delay or deny claims

Managing Dual Coverage

What to Do

1. Inform both insurers of other coverage
2. Update information when anything changes
3. Know which is primary for each family member
4. Provide both insurance cards at appointments
5. Follow up on claims through both insurers

At the Doctor's Office

• Give both insurance cards
• Explain which is primary
• Ensure they bill in correct order
• Keep copies of EOBs from both

Tracking Your Claims

• Review EOBs from both insurers
• Verify secondary received primary's EOB
• Check for correct processing
• Follow up on outstanding claims

Does Dual Coverage Save Money?

Potential Benefits

• Lower out-of-pocket costs
• More services covered
• Secondary may cover primary's gaps

Considerations

• Premium costs for two plans
• Administrative complexity
• Not always cost-effective
• Evaluate during open enrollment

When It Helps Most

• High medical expenses anticipated
• Significant coverage gaps in primary
• Cost of second plan is low/subsidized

Getting Help

If Claims Are Misdirected

• Contact both insurers
• Explain correct order
• Request reprocessing

If Secondary Doesn't Pay

• Verify they received primary's EOB
• Check secondary's COB rules
• Appeal if appropriate

Coordination of benefits can reduce your costs, but requires attention to ensure claims are processed correctly.