A Step-by-Step Guide for Healthcare Providers
Now that you know what primary and secondary insurance mean, it’s time to figure out how to identify which one pays first. Getting this order right is key to preventing claim denials, ensuring faster reimbursements, and maintaining compliance with payer rules.
In this second part of our “Getting COB Right” series, we’ll walk you step-by-step through how to determine the correct payer order using the Coordination of Benefits (COB) process.
Step 1: Gather Complete and Accurate Insurance Information
Start every patient encounter by confirming all active insurance plans. During registration or check-in, ask:
- “Do you currently have more than one active insurance plan?”
- “Who is the policyholder for each plan?”
- “Is your coverage through an employer, government program, or private plan?”
- “Have there been any recent job, marital, or coverage changes?”
Pro Tip: Always scan both sides of each insurance card. The back often contains payer contact info and COB instructions.
Record details like:
- Effective and termination dates
- Policyholder relationship
- Group and plan numbers
Flag patients with multiple coverages in your EHR for ongoing COB verification.
Step 2: Apply the Coordination of Benefits (COB) Rules
COB rules determine which plan is primary based on a patient’s situation.
If the patient has two employer-sponsored plans:
- The patient’s own employer plan is primary.
- The spouse’s employer plan is secondary.
If a child is covered by both parents:
Use the birthday rule the parent whose birthday (month and day) comes first in the year provides the primary plan.
If parents are divorced or separated:
- Court-ordered coverage = primary.
- No court order = custodial parent’s plan is primary.
- Step-parent’s plan may become secondary if remarried.
When Medicare Is Involved:
Medicare’s payer order depends on the patient’s work status and group size:
Pro Tip: Never assume Medicare is always primary; it depends on employment and plan type.
Step 3: Confirm and Document COB with Payers
Even if you’re confident in your determination, always verify directly with the payers using:
- Real-time eligibility portals (e.g., Availity, Experian Health)
- Clearinghouses (Waystar, Change Healthcare/Optum, Office Ally)
- Direct payer calls for complex cases
Ask clearly:
“Can you confirm whether this plan is primary or secondary for [patient name] as of [date of service]?”
Document the rep’s name, date, and reference number in the patient’s chart.
By following these steps, your billing team can confidently identify which insurance is primary and which is secondary, reducing denials and ensuring timely payments.
Up Next: In Part 3, we’ll cover common pitfalls that cause COB errors and the modern tools that make identifying primary vs. secondary coverage easier than ever.
Want expert billing support from a team that knows COB inside and out? Partner with AMS today.