CO-110 — Billing date predates service date
Claim-adjustment reason code 110 · typically reported as CO-110
What it means
The claim’s dates are internally impossible — it was billed before the service supposedly happened.
Why DME claims hit it
- Date-of-service typos (wrong year in January)
- Pre-billing future rental months
How to fix it
- Correct the DOS and resubmit; never pre-bill rental periods
Appeal posture
No — data fix.
Related denial codes
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