CO-14 denial code
The date of birth follows the date of service
How to fix it
Correct the date of birth or the date of service, whichever was keyed wrong, and resubmit.
How to prevent it
Verify demographics electronically so the payer's own spelling and dates are what you submit.
In practice
A paediatric practice bills a newborn visit and the claim returns CO-14. The birth date submitted reads as the following year, because the year rolled over between the birth and the claim build and the default carried forward.
The edit is arithmetic rather than clinical: a patient cannot receive care before being born, so any claim where the birth date follows the service date is rejected without further review.
Correcting the year and resubmitting clears it. Newborn claims filed in early January are the classic instance, and a practice that sees one in that window should check the whole batch rather than the single claim.
What sits behind it
Newborn billing carries a second complication that often arrives alongside this one. Infants are frequently billed under the mother's identifier for an initial period, and the transition to the child's own coverage produces a stretch where demographic data is genuinely in flux and errors are easy to make.
Because the check is absolute, this denial never involves judgement — one of the two dates is wrong and the only question is which. That makes it fast to work, and it makes recurrence a clear signal that something in claim construction is producing the wrong default rather than staff making individual mistakes.
Electronic eligibility verification prevents most instances outright, because the response returns the payer's own birth date and removes the transcription step entirely. Practices still keying demographics from cards see this code and its neighbours at rates that drop sharply once verification is automated.
Related codes
Terms used here — Eligibility Verification · Clean Claim · CMS-1500
How we handle it — Eligibility Verification · Claims Management · Medical Billing & Coding
Primary sources
The rules behind CO-14, at the bodies that publish them.
- Remittance Advice Remark Codes (RARC) (opens in a new tab)
X12 — The remark codes that qualify a CARC on an ERA. Reading the RARC is usually what tells you whether a denial is appealable.
- CMS-1500 claim form standards (opens in a new tab)
National Uniform Claim Committee — Maintainer of the CMS-1500 professional claim form and its data element definitions, plus the provider taxonomy code set.
- NPI Registry (NPPES) (opens in a new tab)
Centers for Medicare & Medicaid Services — Public lookup and management for National Provider Identifiers. A stale NPPES record is a quietly common cause of enrollment and claim rejections.
Looking for a different code? Search all 190 CARC and RARC codes
Questions about CO-14
Because the year is the field most likely to be wrong. Births near the year boundary, systems defaulting to the current year, and the transition from billing under the mother's identifier to the child's own coverage all concentrate demographic errors in exactly the population where the birth date is closest to the service date.
Check both against source records before changing either. The service date is verified against the schedule or the encounter note; the birth date against the payer's eligibility response, which returns the version the edit actually used. Correct whichever disagrees with its source.
The clock keeps running from the date of service throughout, so a claim that bounces on demographics twice can approach the deadline while nothing substantive is in dispute. Work these quickly — they are among the fastest denials to resolve and there is no reason to let one age.
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