CO-253 denial code
Sequestration reduction in federal payment
How to fix it
No action. This is a mandated reduction and is not billable to the patient.
How to prevent it
Expected on Medicare remittances. Configure posting so it is not worked as a denial.
The CO prefix marks this a contractual obligation. The balance is absorbed by the provider under the payer agreement and cannot be transferred to the patient.
In practice
A Medicare remittance shows the expected allowed amount, the patient's coinsurance, and then a small additional reduction coded CO-253. On a $118 allowed amount it is roughly two dollars.
This is sequestration — a statutory percentage reduction applied to the Medicare payment after coinsurance and deductible are calculated. It is not a denial, not an error, and not negotiable.
The only thing worth doing with CO-253 is configuring payment posting to write it off automatically. A practice that routes it into a denial queue is paying someone to look at a mandated reduction on every Medicare remittance line it receives.
What sits behind it
Sequestration comes from the Budget Control Act of 2011 and applies to the Medicare payment amount, not to the allowed amount. That sequence matters: the beneficiary's coinsurance and deductible are calculated first on the full allowed amount, and the reduction applies to what Medicare then pays.
Because of that ordering, the reduction cannot be shifted to the patient. The patient's liability was already determined before it was applied, and collecting the sequestration amount from the beneficiary is prohibited.
The operational cost of CO-253 is entirely self-inflicted. It appears on essentially every Medicare remittance, so any workflow that treats unfamiliar adjustment codes as denials generates a permanent, high-volume queue of items that can never be resolved. Posting rules should recognise it and adjust it without human attention.
Related codes
Terms used here — Contractual Adjustment · Allowed Amount · Payment Posting
How we handle it — Practice Analytics · Revenue Cycle Management · Claims Management
Primary sources
The rules behind CO-253, at the bodies that publish them.
- Medicare Physician Fee Schedule lookup (opens in a new tab)
Centers for Medicare & Medicaid Services — Official allowed amounts by CPT/HCPCS code and locality. The reference point most commercial contracts are written against as a percentage.
- Medicare Claims Processing Manual (opens in a new tab)
Centers for Medicare & Medicaid Services — The operative manual for how Medicare claims must be coded, submitted, adjusted and appealed. When a payer policy and a vendor's advice disagree, this settles it.
Every denial code with a guide
Authorization
Bundling
Contractual
- CO-45A Contractual Adjustment
- CO-253Sequestration Reduction
- CO-147Contracted Rate Expired
- CO-222Contracted Unit Cap Exceeded
Coverage
Data quality
Documentation
Eligibility
Liability and workers comp
Patient responsibility
Provider eligibility
Timely filing
Looking for a different code? Search all 190 CARC and RARC codes
Questions about CO-253
A statutory percentage reduction to Medicare payments under the Budget Control Act of 2011. It applies to what Medicare pays, after the beneficiary's coinsurance and deductible have been calculated on the full allowed amount.
No. Patient liability is determined before the reduction is applied, so the amount was never part of what the beneficiary owed. Collecting it from the patient is prohibited.
No. It is a mandated reduction rather than a payer decision, and there is no discretion to appeal to. It should be adjusted automatically at payment posting.
Configure payment posting to recognise and write it off without human review. It appears on nearly every Medicare remittance, so routing it into a denial queue creates a large permanent worklist of items that can never be resolved.
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