What CO-55 means
The procedure billed is inconsistent with the patient's age based on the payer's coverage rules. Often a data entry error (wrong date of birth) or a legitimate age-related coverage limit that can be appealed with supporting clinical rationale.
Common causes
- Patient's date of birth is incorrect on the claim
- Procedure has a payer-defined age limit that the patient falls outside
- Age-appropriate exception applies but wasn't documented
How to appeal CO-55
First verify the date of birth on file with the payer matches the actual patient. If it's a data error, correct and resubmit. If the age limit is real, appeal with clinical documentation supporting why the service was medically appropriate for this patient despite falling outside the standard age range, citing the payer's exception provisions.
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