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Appeal how-to guide CARC 22

How to appeal a coordination of benefits denial.

Last updated: August 2026

Coordination of Benefits denials are among the most solvable in medical billing, once you understand who is primary and why. The resolution path is almost always to submit to the correct payer in the correct order, or to provide the COB information the payer needs to adjudicate.

What the full brief covers

Signed-in members see the full brief. Here is what it contains.

  • How COB works
  • Why you received the COB denial
  • How to resolve and appeal
  • When a COB denial is appealable
  • Writing the appeal
  • Prevention
  • Coordination of benefits appeal letter template (fillable Word download)

Subscribe to read the full denial brief.