CO-9
Diagnosis inconsistent with the patient's age
What This Code Means
The diagnosis code billed is not clinically consistent with the patient’s age.
Common Causes
- Pediatric- or adult-specific ICD-10 code used for the wrong age group
- Data entry error in date of birth
How to Resolve or Appeal
- Confirm patient date of birth on the claim
- Verify the diagnosis code is age-appropriate; correct and resubmit
More Denial Codes to Check
Educational reference only — not medical or legal advice. Always confirm code usage and appeal rights with the specific payer.