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N648 Remark Code: Stop-Loss Provision Applied

N648 means the payer adjusted the claim based on a stop-loss provision, a contract or fee schedule term that changes the payment method once charges or costs pass a threshold. It usually appears on expensive inpatient stays.

Code: N648 (RARC N648)
Status: Active In use since July 15, 2013.
Code set: Remittance Advice Remark Codes (RARC)
Group codes: CO (Contractual Obligation): The adjustment reflects the contract's or fee schedule's stop-loss terms and is the provider's write-off, not patient responsibility.
PR (Patient Responsibility): Patient cost-sharing on the stay is still reported separately under PR.
Official description: Adjusted based on Stop Loss.
X12 Remittance Advice Remark Codes, retrieved September 25, 2026
Last verified: September 24, 2026 against the official X12 list.

What N648 means

Fixed-rate payment methods such as DRGs or per diems work for typical cases but can leave a hospital badly underpaid on extreme ones. A stop-loss provision addresses that. Once the claim’s charges (or costs) cross a defined threshold, the payer stops using the fixed rate and pays some other way, often a percentage of all charges or of charges above the threshold.

N648 tells you the stop-loss provision was triggered and shaped the payment. You will see it mostly on facility claims under commercial hospital contracts, and on some workers’ compensation hospital fee schedules that include stop-loss rules.

Common reasons the amount looks wrong

Threshold not recognized. The payer’s charge total may exclude items the contract carves out, so the claim fell just short of stop-loss.
Wrong percentage. The payer applied a rate that does not match the current contract.
First-dollar versus excess. Contracts differ on whether the percentage applies to all charges or only those above the threshold.
Charges disallowed first. Line items denied during review lower the total used in the calculation.

What to do

Pull the stop-loss clause from the contract or the applicable fee schedule.
Rebuild the calculation: eligible charges, threshold, percentage, and any carve-outs.
Compare it to the remittance. If it matches, post the adjustment.
If it does not, send the payer your calculation and request reprocessing, or file a payment dispute under the contract.
Challenge line-item denials separately if they reduced the charges that counted toward the threshold.

How to prevent it

Model stop-loss terms in your contract management tool so high-dollar claims are flagged and their expected payment is calculated before the remittance arrives. That makes underpayments on the largest claims easier to catch quickly.

Codes that may appear with N648

CO-45 (Charge exceeds fee schedule/maximum allowable or contracted/legislated fee arrangement.): Charges exceeded the amount allowed under the stop-loss calculation.
CO-25Deactivated (Payment denied.): A stop-loss deductible that has not been met, when the arrangement includes one.

N647 (Adjusted based on diagnosis-related group (DRG).): DRG-based pricing, which stop-loss often replaces for high-cost cases.
CO-70 (Cost outlier - Adjustment to compensate for additional costs.): Cost outlier adjustment, a different mechanism for paying extra on unusually costly stays.
N673 (Reimbursement has been calculated based on an outpatient per diem or an outpatient factor and/or fee schedule amount.): Outpatient per diem, factor, or fee schedule pricing.

N648 FAQ

Does stop-loss increase or decrease payment?

It depends on the terms. Stop-loss usually protects the facility by paying a percentage of charges once a high threshold is passed, but the remittance adjustment can still reduce billed charges to that percentage.

Which charges count toward the threshold?

That is defined in the contract or fee schedule. Some exclude certain items such as implants or specific drugs, or apply the threshold to allowed charges only.

Is stop-loss the same as an outlier payment?

No. Outlier payments are an add-on within systems like DRG pricing; stop-loss is a contract or fee schedule provision that switches the method. Some arrangements have both.

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