CARC 109: Claim/service not covered by this payer/contractor. You must send the claim/service to the correct payer/contractor.
Wrong payer. The carrier is telling the provider to bill someone else.
CARC 109 appears on the 835 ERA (Electronic Remittance Advice) that the payer returns after claim adjudication. It explains a reduction, denial, or payment adjustment to your billing team. For your practice, the question is workflow: identify the pattern, route the denial to the right resolution path (rebill, appeal, write-off), and recover what's recoverable without burning RVU time on dead-end fights.
What CARC 109 means
The official X12 description is: “Claim/service not covered by this payer/contractor. You must send the claim/service to the correct payer/contractor.”
In plain language: Wrong payer. The carrier is telling the provider to bill someone else.
Common scenarios
- Medicare Advantage vs Original Medicare confusion
- Medicaid MCO vs fee-for-service Medicaid
- Self-funded TPA vs underlying carrier
Practice workflow for CARC X 109
Identify the correct payer from your insurance cards. Update the provider with correct info and have them resubmit.
CARC 109 group codes explained
On the 835 ERA, CARC 109 appears alongside a group code that signals who is financially responsible for the adjustment. CO (Contractual Obligation) — Contractual write-off. The provider agreed to the rate. Patient does NOT owe this amount.
Frequently asked questions
What does CARC 109 mean?
Claim/service not covered by this payer/contractor. You must send the claim/service to the correct payer/contractor. In plain language: Wrong payer. The carrier is telling the provider to bill someone else.
Is CARC 109 appealable?
CARC 109 is usually not appealable on its own — it's typically a contractual, informational, or routine adjustment. Identify the correct payer from your insurance cards. Update the provider with correct info and have them resubmit.
Which group code does CARC 109 appear under?
CARC 109 most often appears under: CO (Contractual Obligation) — Contractual write-off. The provider agreed to the rate. Patient does NOT owe this amount.
When does CARC 109 typically appear on a denial?
Common scenarios: Medicare Advantage vs Original Medicare confusion; Medicaid MCO vs fee-for-service Medicaid; Self-funded TPA vs underlying carrier.
What should I do if I see CARC 109 on the 835?
Identify the correct payer from your insurance cards. Update the provider with correct info and have them resubmit.
Related resources
Sources
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