CO 6: Age Mismatch
The procedure does not fit the patient's age.
Check the date of birth on the claim against the age range on the code, then correct whichever is wrong.
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What CO 6 means
CO: Contractual obligation. The provider absorbs it and cannot bill the patient.
So the balance cannot move to the patient. Either the appeal recovers it or the practice absorbs it. That makes the appeal decision the whole decision on this line.
Is It Worth Appealing?
Fix and resubmit. This is a correction, not an appeal. Appealing burns the deadline.
Why It Fires
In the order we see it.
A wrong date of birth on the claim.
A code carrying an age restriction billed outside that range.
How to Fix CO 6, Step by Step
Check the date of birth on the claim against the age range on the code, then correct whichever is wrong.
- 1Step 1: Read the remark code. Find the remark code printed next to CO 6 on the 835 or EOB. It says what the payer wants back.
- 2Step 2: Find the cause. Match the denial to one of the 2 causes in Why It Fires above, and fix that one.
- 3Step 3: Do this. Check the date of birth on the claim against the age range on the code, then correct whichever is wrong.
- 4Step 4: Attach the documentation. The corrected date of birth, or a code appropriate to the patient's age.
The common mistake. Do not appeal before you check the date of birth. It is usually a typo, and a correction pays faster than an argument.
Free: the Denial Code Appeal Playbook. 53 codes on one sheet: appeal, fix and resubmit, or let it go, and what to attach. Get the playbook
CO 6 description
The procedure does not fit the patient's age.
The procedure does not fit the patient's age. So the balance cannot move to the patient. Either the appeal recovers it or the practice absorbs it. That makes the appeal decision the whole decision on this line.
This is our plain-English wording, not the official X12 text. X12 asserts copyright over the published descriptions, so we write our own and say what it means for the money rather than restating the code.
Where this comes from. This is our own reading of the code, not the payer's and not a copy of the standards text. We classify it from how these denials actually resolve. Where we are unsure, we say so rather than guessing.
Related Codes
Your Questions Answered
What does CO 6 mean?
The procedure does not fit the patient's age. Contractual obligation. The provider absorbs it and cannot bill the patient.
Can you appeal CO 6?
Fix and resubmit. Check the date of birth on the claim against the age range on the code, then correct whichever is wrong.
Why does CO 6 happen?
A wrong date of birth on the claim. A code carrying an age restriction billed outside that range.
What documentation wins a CO 6 appeal?
The corrected date of birth, or a code appropriate to the patient's age.
How do I fix a CO 6 denial?
Step 1: Read the remark code. Find the remark code printed next to CO 6 on the 835 or EOB. It says what the payer wants back. Step 2: Find the cause. Match the denial to one cause: A wrong date of birth on the claim. A code carrying an age restriction billed outside that range. Step 3: Do this. Check the date of birth on the claim against the age range on the code, then correct whichever is wrong. Step 4: Attach the documentation. The corrected date of birth, or a code appropriate to the patient's age.
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