CO B15: Qualifying Service Required
A required prior service was not billed or not covered.
Bill the qualifying service, or appeal showing it was performed and covered.
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What CO B15 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?
Usually recoverable. Appeal it. The money is usually there.
How to Appeal CO B15, Step by Step
Bill the qualifying service, or appeal showing it was performed and covered.
- 1Step 1: Read the remark code. Find the remark code printed next to CO B15 on the 835 or EOB. It says what the payer wants back.
- 2Step 2: Take the first action. Bill the qualifying service, or appeal showing it was performed and covered.
- 3Step 3: Send the appeal before the deadline. Send it to the payer with the claim, the denial and the documentation, inside the payer's appeal window. See what an appeal letter must contain and the filing limits by payer.
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 B15 description
A required prior service was not billed or not covered.
A required prior service was not billed or not covered. 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
CO 236
This procedure and another one billed the same day cannot be billed together under NCCI.
Read the CO 236 pageCO 97
The payer says this is already paid inside another service.
Read the CO 97 pageCO 234
This procedure is not paid separately.
Read the CO 234 pageCO 107
The related service this one depends on was not on the claim.
Read the CO 107 page
Your Questions Answered
What does CO B15 mean?
A required prior service was not billed or not covered. Contractual obligation. The provider absorbs it and cannot bill the patient.
Can you appeal CO B15?
Usually recoverable. Bill the qualifying service, or appeal showing it was performed and covered.
How do I appeal a CO B15 denial?
Step 1: Read the remark code. Find the remark code printed next to CO B15 on the 835 or EOB. It says what the payer wants back. Step 2: Take the first action. Bill the qualifying service, or appeal showing it was performed and covered. Step 3: Send the appeal before the deadline. Send it to the payer with the claim, the denial and the documentation, inside the payer's appeal window.
Most searched: CO 97 · CO 96 · OA 23 · PR 204 · CO 109 · CO 197 · CO 45 · CO 50
How Much of This Is Sitting in Your Write-Off Pile?
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Upload your denial summary for the last 90 days. 4 columns: payer, CARC code, count, billed amount. You get back which were winnable and what they were worth.