CO-110: Billing Date Predates Service Date
A date entry error put the billing date before the service date. Fix the date, resubmit the claim. This is a simple correction — no appeal needed, no patient billing.
What Does CO-110 Mean?
CO-110 is the only group code used with CARC 110. It indicates a contractual adjustment for a provider-side data entry error where the billing date precedes the service date. The provider must correct the date and resubmit — the patient cannot be billed for this administrative error.
CARC 110 fires when the payer's system detects that the billing date (the date the claim was submitted or created) precedes the service date (the date the service was actually rendered to the patient). This is a logical impossibility — you cannot bill for a service before it happens — and payers reject these claims as a basic data quality control.
This is almost always a data entry error. The most common scenarios include typos in the date field (wrong year, transposed digits), billing software auto-populating an incorrect date, or EHR-to-billing system integration issues that corrupt date fields during data transfer. It can also occur when claims are batched for submission and the batch creation date is incorrectly entered as the billing date for services not yet performed.
CARC 110 appears exclusively under CO because this is a provider-side administrative error. The fix is straightforward: identify which date is wrong, correct it, and resubmit. This denial never requires an appeal and should never result in patient billing. If you see CARC 110 frequently, the root cause is almost certainly a systemic issue in your billing workflow or software configuration that needs to be addressed.
Common Causes
| Cause | Frequency |
|---|---|
| Data entry errors in billing date Staff manually entered an incorrect billing date during the claim creation process, resulting in a date that falls before the actual date of service — common with typos in date fields or incorrect year entries | Most Common |
| System glitches or software integration failures Technical issues in the billing software, EHR-to-billing system integration, or clearinghouse processing caused the billing date to be incorrectly populated with a date earlier than the service date | Common |
| Incorrect coding or date field misinterpretation Manual coding errors or misinterpretation of date guidelines led to the wrong date being entered in the billing date field, particularly when handling claims with multiple service dates or date ranges | Common |
| Delayed submission creating date confusion Administrative delays in claim preparation led to confusion between the date the claim was created in the system and the actual date of service, especially when claims are batched and submitted in bulk | Occasional |
| Insufficient documentation of service dates Missing or incomplete documentation of actual service dates caused the billing team to enter incorrect dates, particularly for services spanning multiple days or those with complex scheduling | Occasional |
How to Resolve
Identify and correct the date discrepancy between the billing date and service date, then resubmit the claim with accurate dates.
- Identify the date error Compare the billing date and service date on the rejected claim. Cross-reference with the medical record and scheduling system to confirm the correct service date.
- Investigate the cause Determine if the error was manual (typo, wrong year) or systemic (software bug, integration issue). Check if other claims in the same batch have similar date problems.
- Correct and resubmit Update the billing date to the correct date (on or after the service date) and resubmit the claim. Verify all date fields on the claim are internally consistent.
- Fix the systemic issue If the error was caused by a software or integration problem, address the root cause to prevent future occurrences. Test the fix with a sample claim before resuming normal billing.
CO-110 is a correctable data entry error where the billing date precedes the service date. Fix the date discrepancy and resubmit the claim. Appeals are not appropriate for date correction issues.
Common RARC Pairings
The RARC code tells you exactly what triggered the CO-110:
| RARC | Description |
|---|---|
| M51 | Missing or incomplete/invalid billing date information Correct the billing date to reflect the actual submission date on or after the service date → |
How to Prevent CO-110
- Implement automated date validation in your billing system that flags claims where the billing date precedes the service date before submission
- Require service dates to be documented in real-time at the point of care to ensure accuracy
- Set up communication protocols between clinical and billing departments to ensure correct service dates are transferred
- Conduct regular staff training on proper date entry procedures and common date-related errors
- Test billing software integrations after updates to verify date fields populate correctly
- Audit submitted claims periodically to identify date discrepancy patterns before they result in denials
General Prevention
- Implement automated date validation in the billing system that flags claims where the billing date precedes the service date before submission
- Establish clear documentation practices that require service dates to be recorded in real-time at the point of care
- Set up communication protocols between clinical and billing departments to ensure accurate service date transfer
- Perform regular audits of submitted claims to identify and correct date discrepancy patterns before they become systemic
- Test billing software integrations after updates to ensure date fields are being populated correctly
Related Denial Codes
Sources
- https://www.mdclarity.com/denial-code/110
- https://droidal.com/blog/medical-billing-denial-codes/
- https://practiceperfectss.com/list-of-denial-codes-in-medical-billing/
- Codes maintained by X12. Visit x12.org for official definitions.