CO-109 — Wrong payer / contractor for this claim
Claim-adjustment reason code 109 · typically reported as CO-109
What it means
This payer says the claim belongs to a different payer or contractor — a jurisdiction miss, not a coverage decision.
Why DME claims hit it
- DME items sent to the A/B MAC instead of the DME MAC (or the wrong DME MAC jurisdiction for the patient’s address)
- Hospice-related items billed to Medicare instead of the hospice
- MA plan member billed to Original Medicare
How to fix it
- Determine the correct jurisdiction (patient’s permanent address drives DME MAC A–D)
- Rebill the proper contractor/payer — timely filing usually runs from original receipt if you document it
Appeal posture
No — redirect the claim.
Related denial codes
CO-22 — Another payer may be responsible (coordination of benefits)CO-5 — Procedure inconsistent with place of serviceCO-58 — Treatment location inappropriate for the service
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