CO-253 Denial Code: Sequestration Payment Reduction
CO-253 is the sequestration reduction in federal payment. It is a mandatory adjustment, not a denial, and it cannot be appealed or billed to the patient.
What CO-253 Means and How to Resolve It
Sequestration - reduction in federal payment A mandatory federal reduction applied to the payment after the allowed amount is calculated. It appears routinely on Medicare remittances and is not caused by anything on the claim.
- No corrective action applies.
- The adjustment is posted as a contractual write-off.
- Because the group code is CO, the amount cannot be billed to the patient, and resubmitting the claim will not change the outcome.
- Not preventable.
- Post it correctly as a contractual adjustment so that reporting reflects true collections, and make sure staff do not mistake it for a denial and spend time reworking claims that were paid correctly.
Source: X12.org Official CARC Registry
CO-253 in Detail
CO-253 is a mandatory federal payment reduction applied to Medicare claims, not a denial and not a billing error. It appears on the remittance as a separate adjustment line and reflects sequestration applied after the allowed amount has been determined.
It cannot be appealed, and because it carries the contractual obligation group code the amount cannot be transferred to the patient. It is posted as a write-off and is a routine feature of Medicare billing rather than something to work.
How to Handle CO-253 Denials
Identify the Root Cause
Review the claim submission to find the specific reason. Check the modifier-procedure combination and payer-specific coding requirements.
Gather Documentation
Collect the clinical documentation, EOB, and any payer communication needed to support a corrected claim or appeal.
Correct and Resubmit
Make the appropriate corrections: update codes, modifiers, or attach documentation, then resubmit within the payer's timely filing window.
Track and Prevent
Log this denial type in your denial tracking system and implement a front-end check to prevent the same issue on future claims.
Appealing a CO-253 Denial
Corrected Claim or Appeal
These are different routes and choosing wrong costs time. If the denial was caused by something fixable on your side, a wrong modifier, a missing authorization number, or a transposed code, submit a corrected claim. It is faster and does not consume an appeal level. File a formal appeal when the original claim was correct and you believe the payer applied its policy incorrectly.
What to Submit
Include the remittance advice showing the denial, the claim as originally submitted, the clinical documentation that supports medical necessity, and a short cover letter that cites the payer's own coverage policy. Take the filing deadline from the remittance advice or determination letter for that specific claim rather than a general rule, since it differs by payer and by appeal level.
Medicare Appeal Levels
Original Medicare fee-for-service appeals move through five levels, and each one must be exhausted before the next:
- 1Redetermination by the Medicare Administrative Contractor (MAC)
- 2Reconsideration by a Qualified Independent Contractor (QIC)
- 3Decision by the Office of Medicare Hearings and Appeals (OMHA)
- 4Review by the Medicare Appeals Council
- 5Judicial review in federal district court
Source: CMS, Medicare Fee-for-Service Appeals
CO-253, PR-253, PI-253: Why the Group Code Matters
The number 253 always carries the same reason for the adjustment. The two-letter group code in front of it decides who is left owing the balance, which is why the same denial reason can arrive as CO-253 on one remittance and PR-253 on another.
Contractual Obligation. The provider absorbs the amount under the payer contract and cannot bill the patient for it.
Patient Responsibility. The balance moves to the patient and may be billed, subject to the payer agreement.
Payer Initiated Reduction. The payer reduced payment on its own initiative, not under a contractual term.
Other Adjustment. Used when neither contractual obligation nor patient responsibility applies.
Group code definitions follow the X12 claim adjustment structure.
CO-253 Denial Code Reference
| Field | Details |
|---|---|
| CARC Code | CO-253 |
| Code Group | Contractual Obligation (CO) |
| Official Description | Sequestration - reduction in federal payment |
| Common Cause | A mandatory federal reduction applied to the payment after the allowed amount is calculated. It appears routinely on Medicare remittances and is not caused by anything on the claim. |
| Resolution | No corrective action applies. The adjustment is posted as a contractual write-off. Because the group code is CO, the amount cannot be billed to the patient, and resubmitting the claim will not change the outcome. |
| Prevention | Not preventable. Post it correctly as a contractual adjustment so that reporting reflects true collections, and make sure staff do not mistake it for a denial and spend time reworking claims that were paid correctly. |
Source: X12.org Official CARC Registry
Related Billing Resources
CO-253, Frequently Asked Questions
Sequestration - reduction in federal payment
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