N381 Remark Code: Check Your Contract, Not a Denial by Itself

What is the N381 remark code? N381 is an informational Remittance Advice Remark Code (RARC) reading "Alert: Consult our contractual agreement for restrictions/billing/payment information related to these charges," which tells the provider that its contract with the payer governs the adjustment on that line.

Undeny's Take

N381 is the payer saying "it's in your contract," which is only helpful if you can find the contract. Keep the current participation agreement, fee schedule and any referenced reimbursement policies where your billing team can reach them, because every N381 is a prompt to check the allowed amount against those documents. Two habits pay off. First, when the paid amount is lower than your contracted rate, N381 does not end the conversation; the contract is your evidence. Second, watch for N381 used as the only remark on a reason code that requires a real explanation. X12 says several reason codes need a remark that is not an Alert, so an Alert alone leaves the remittance short of the specific reason you are owed.

What N381 Means as an Alert Remark Code

Searches for the N381 denial code or remark code N381 lead to the same text. The X12 description is "Alert: Consult our contractual agreement for restrictions/billing/payment information related to these charges." The Medicare Claims Processing Manual (Pub. 100-04, Chapter 22, section 60.3) explains that "Informational" remark codes "start with the word 'Alert' and can be reported without Group and Claim Adjustment Reason Code," because they provide "general adjudication information" rather than explaining a specific adjustment.

That has a practical consequence. Reason codes such as CARC 16, 96, 226 and 252 state that "At least one Remark Code must be provided" and that it must be a "Remittance Advice Remark Code that is not an ALERT." N381 cannot be that required remark.

How Payers Pair N381 With Reason Codes

SAIF, an Oregon workers' compensation insurer, publishes its explanation codes, and each N381 row in that list pairs it with reason code 45 ("Charge exceeds fee schedule/maximum allowable or contracted/legislated fee arrangement"):

• "Adjustment applied for MCO contract package price."
• "Adjustment applied to reflect MCO contract rate or discount. Direct inquiries/appeals to the MCO."
• "Adjustment reflects SAIF negotiated amount."
• "Adjustment applied to reflect SAIF/provider agreement."

In each row, reason 45 and N381 appear together, so on a contractual line you would see CO-45 N381. The reduction came from a contracted rate, package price or agreement, and the remark sends the provider to that agreement for the terms.

How to Work an N381 Line

1. Read the group code and reason code on the same line. They tell you what was adjusted and who carries it.
2. Pull the participation agreement, fee schedule and any policies it incorporates for that payer, product and date of service.
3. Compare the allowed amount with the contracted rate, including any package or bundled pricing terms.
4. If the payment is below contract, file a payment dispute or appeal with the contract page and fee schedule attached. The appeal generator can draft it.
5. If N381 is the only remark on a reason code that requires a non-Alert remark, ask the payer for the specific reason before deciding what to do.
6. If the payment matches the contract, post the adjustment. A CO amount is not billed to the patient.

N381 Compared With N130, CO-45, CO-24 and CO-16

N130 is the member-side cousin: it points to the plan's benefit documents, while N381 points to your provider contract. CO-45 is the fee-schedule write-off that N381 accompanies in SAIF's published codes. CO-24 means the charges are covered under a capitation agreement or managed care plan. CO-16 is a reason code that needs a specific, non-Alert remark. For a contract-based dispute, see the insurance appeal letter template.

Frequently Asked Questions

Is N381 a denial code?

No. N381 is an Alert remark code that CMS describes as informational. Any denial or reduction on the line comes from the group code and reason code beside it, and N381 adds that your contract governs the terms.

Can I bill the patient when N381 appears?

It depends on the group code on the line, not on N381. A CO adjustment is a contractual write-off that is not billed to the patient. A PR amount, such as a deductible or copay, may be billed to the patient.

What is the difference between N381 and N130?

N130 tells you to consult the plan's benefit documents for restrictions on the service, which concerns the patient's coverage. N381 tells you to consult your contractual agreement with the payer, which concerns your rates and billing terms. They lead to different documents.

Can N381 be the only remark code on a CO-16?

It should not be. X12 says CARC 16 requires at least one remark code that is not an Alert, and N381 is an Alert. If it is the only remark, ask the payer for the specific missing information or billing error.

Informational only, not legal, medical, or billing advice. Always verify against your current payer contract and policy.

Check every N381 against your contract

Undeny compares the payment to your contracted rate and drafts the dispute when it falls short. Generate an appeal · Browse denial codes