CO 204: Service Not Covered by Plan
Not covered under the patient’s current benefit plan.
Check for an ABN or a patient waiver, then bill the patient or write off.
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What CO 204 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.
The same code, a different prefix. 204 also arrives as PR 204. The reason for the denial is the same. The prefix decides who pays for it, so the next step is not the same. If your remit says PR 204, read that page instead.
Is It Worth Appealing?
Usually lost. Recoverable only with unusual evidence. Triage by dollar value.
Why It Fires
In the order we see it.
The service is excluded from the patient's current benefit plan.
How to Appeal CO 204, Step by Step
Check for an ABN or a patient waiver, then bill the patient or write off.
- 1Step 1: Read the remark code. Find the remark code printed next to CO 204 on the 835 or EOB. It says what the payer wants back. The usual ones are N30.
- 2Step 2: Find the cause. Match the denial to one of the cause in Why It Fires above, and fix that one.
- 3Step 3: Take the first action. Check for an ABN or a patient waiver, then bill the patient or write off.
- 4Step 4: Attach the documentation. An ABN signed before the service was delivered.
- 5Step 5: 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.
The common mistake. Do not bill the patient on a Medicare claim without a valid ABN signed in advance.
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 204 description
Not covered under the patient’s current benefit plan.
Not covered under the patient’s current benefit plan. 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.
The Remark Code Beside It
The adjustment code says the claim was reduced. The remark code printed next to it says why, and it is the one that tells you what to send back.
| Remark | What it means |
|---|---|
| N30 | The patient was not eligible for this particular service on that date. That is narrower than not being covered at all, and the difference matters. |
Related Codes
Your Questions Answered
What does CO 204 mean?
Not covered under the patient’s current benefit plan. Contractual obligation. The provider absorbs it and cannot bill the patient.
Can you appeal CO 204?
Usually lost. Check for an ABN or a patient waiver, then bill the patient or write off.
Why does CO 204 happen?
The service is excluded from the patient's current benefit plan.
What documentation wins a CO 204 appeal?
An ABN signed before the service was delivered.
How do I appeal a CO 204 denial?
Step 1: Read the remark code. Find the remark code printed next to CO 204 on the 835 or EOB. It says what the payer wants back. Step 2: Find the cause. Match the denial to one cause: The service is excluded from the patient's current benefit plan. Step 3: Take the first action. Check for an ABN or a patient waiver, then bill the patient or write off. Step 4: Attach the documentation. An ABN signed before the service was delivered. Step 5: 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
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