Date of Birth Follows Date of Service

What it means

The claim was denied because the patient's date of birth listed is after the date the service was provided, which is logically impossible. This usually points to a data entry error in either the date of birth or the date of service.

Common causes

Typo in the patient's date of birth (e.g., wrong month, day, or year entered)
Typo in the date of service field on the claim
Incorrect date format causing month/day transposition (MM/DD vs DD/MM)
Outdated or incorrect demographic information in the practice management system
Data entry error during patient registration or claim submission
System or interface error transmitting the date fields incorrectly to the payer

How to fix it

Pull the patient's registration record and verify the correct date of birth against a valid ID or insurance card
Confirm the actual date the service was rendered from the encounter documentation
Compare both dates to identify which one was entered incorrectly on the claim
Correct the erroneous date in your practice management or billing system
Resubmit the corrected claim with accurate date of birth and date of service
Check the date format settings in your billing software to prevent recurring formatting errors
Update the patient's master file if the date of birth was wrong so it doesn't recur on future claims

Appeal / resubmit

Before filing an appeal, first verify whether this is a straightforward data entry error that can be corrected and resubmitted rather than appealed, since correcting and resubmitting the claim with accurate dates is often faster than an appeal. If you believe the payer's system misread the dates correctly submitted, include supporting documentation such as the patient's ID, insurance card copy, and the encounter note showing the correct date of service in your appeal or corrected claim submission.

Related codes

Frequently asked

Why would a claim be denied for this reason if the dates were entered correctly?

Sometimes the issue is a formatting mismatch between your system and the payer's system, such as confusing month/day order, which can make correct dates appear invalid. Double-check the exact format expected by the payer.

Do I need to resubmit the entire claim or just correct the date?

In most cases, you'll need to submit a corrected claim with the accurate date of birth and/or date of service rather than just an addendum, since this affects core claim eligibility fields.

Could this denial indicate identity theft or a mismatched patient record?

It's worth verifying that the correct patient record was used, especially if the date of birth doesn't match other information on file, though most cases are simple typographical errors.

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This content is informational only and does not constitute billing or legal advice. Always verify requirements with the specific payer and consult qualified billing or compliance professionals for your situation.