Claim Denied for Coordination of Benefits
How do I resolve a coordination-of-benefits denial?
A coordination-of-benefits denial usually means the plan needs to know whether another insurer should pay first. The right response is to establish coverage and payer order for the service date, not to resubmit the same claim repeatedly without updating the records.
Get help with my bill →List coverage that actually existed on the service date
Gather plan names, member IDs, effective dates, termination dates, and whether coverage came from work, a spouse, a parent, or a public program. Do not assume a plan you have now also covered an earlier appointment. Ask which other coverage the denying plan has on file.
Ask how the plan determined payer order
The primary payer processes first; a secondary payer may then consider the remaining claim under its own rules. You generally cannot choose the order. Rules depend on the coverage combination and circumstances. Medicare coordination can depend on current employment, employer size, disability, or other factors, so confirm the applicable rule.
Correct the insurer’s coverage record
Complete the requested COB questionnaire or contact the plan’s coordination team. If it lists a plan that ended, supply termination evidence. If it lists missing coverage, provide the accurate information. Request written confirmation of the update and ask whether earlier denied claims will be reprocessed automatically.
Coordinate with the provider
Give billing the confirmed primary and secondary information. Ask whether the primary EOB must accompany the secondary submission and who will send it. Record the claim numbers separately. A secondary plan does not necessarily pay every amount the first insurer leaves unpaid.
Track reprocessing and deadlines
Ask for an expected completion date and a billing hold. If the plan still denies payment after the COB record is accurate, obtain the new reason and appeal instructions. Keep the original appeal deadline visible while records are corrected; a questionnaire alone may not count as an appeal.
Which plan rules apply?
For commercial coverage, check the policy and state-specific instructions. A self-funded employer plan can use different oversight and appeal rules even when an insurer administers claims. Medicare and Medicaid use program-specific notices and review routes. Confirm the applicable deadline, whether a correction counts as an appeal, and where to escalate; do not substitute a deadline from a different plan.
Sources and further help
These sources provide general guidance. For a deadline or requirement that applies to you, follow your plan’s notice or the appropriate program’s current instructions.
- Medicare.gov: Coordination with other insurance ↗
- Medicare.gov: Who pays first? ↗
- CMS: Action plan for a denied insurance claim ↗
Insurer websites may ask you to select your state or sign in. If a page will not open, use the member services number on your insurance card and ask for the current appeal instructions for your plan.