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N777 Remark Code: Assignment of Benefits Indicator

N777 means the Assignment of Benefits indicator was missing from the claim. That indicator tells the payer whether the insured authorized payment to go directly to the provider, so without it the payer cannot determine who should be paid.

Quick facts

Code
N777 (RARC N777)
Status
Active In use since November 1, 2016; last modified March 1, 2017.
Code set
Remittance Advice Remark Codes (RARC)
Group codes
  • CO (Contractual Obligation): The claim was not paid because of a billing omission the provider must correct. Not patient responsibility.
Official description
Missing Assignment of Benefits Indicator.
X12 Remittance Advice Remark Codes, retrieved September 25, 2026
Last verified
against the official X12 list.

What N777 means

An assignment of benefits is the patient’s, or insured’s, authorization for the payer to send payment directly to the provider. Most practices collect it on intake paperwork and report it on each claim. On the CMS-1500 it appears in box 13, usually as “Signature on File”; electronic claims carry an indicator with the same meaning.

N777 says the indicator was missing. Without it, the payer cannot tell whether to pay you or the patient, so it denies the claim, typically with CARC 16.

Common causes

  • Box 13 was left blank on a paper claim.
  • The practice management system did not have the assignment flag set for this patient.
  • A new patient’s intake forms were not scanned or recorded before billing.
  • Software updates reset a default value in the claim template.

How to fix it

  1. Confirm a signed assignment of benefits is on file for the patient.
  2. If it is, update the patient’s account so the indicator is set, and send a corrected claim with resubmission code 7.
  3. If none exists, obtain the patient’s signature, then resubmit.
  4. For property and casualty or workers’ compensation claims, follow the carrier’s own assignment requirements, which may differ.

How to prevent it

Make the assignment of benefits a required registration field, refreshed on the schedule your policy sets, and use a claim edit that blocks submission when the indicator is empty. Box-level checks like these are a good fit for a claims validator.

Codes that may appear with N777

  • CO-16 (Claim/service lacks information or has submission/billing error(s).): The claim lacks information, here the assignment of benefits indicator.
  • CO-A1 (Claim/Service denied.): A general denial explained by the missing indicator.
  • N595 (Records reflect the injured party did not complete an Assignment of Benefits for this loss.): The injured party did not complete an assignment of benefits for a property and casualty loss.
  • MA75 (Missing/incomplete/invalid patient or authorized representative signature.): The patient or authorized representative signature is missing or invalid.
  • MA09 (Alert: Claim submitted as unassigned but processed as assigned in accordance with our current assignment/participation agreement.): An unassigned claim was processed as assigned under the participation agreement.

N777 FAQ

Where is assignment of benefits shown on the CMS-1500?

Box 13 holds the insured's authorization of payment to the provider, often entered as 'Signature on File'. Electronic claims carry an equivalent indicator.

What if the patient never signed an assignment?

Obtain a signed assignment of benefits if possible. Without one, some payers pay the patient directly instead of the provider.

Is the assignment of benefits the same as accepting assignment?

No. Assignment of benefits is the patient's authorization to pay you. Accepting assignment, shown in box 27, is the provider's agreement to the payer's terms, which matters for Medicare.