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N888 Remark Code: Electronic Info Request Sent

N888 is an alert that the payer has sent an electronic request for additional information about this claim. The claim may be held or denied until you supply what the request asks for.

Code: N888 (RARC N888)
Status: Active In use since July 1, 2023.
Code set: Remittance Advice Remark Codes (RARC)
Group codes: CO (Contractual Obligation): Amounts not paid while the payer waits for the requested information. They should not be billed to the patient.
Official description: Alert: An electronic request for additional information has been sent for this claim.
X12 Remittance Advice Remark Codes, retrieved September 25, 2026
Last verified: September 24, 2026 against the official X12 list.

What N888 means

Some payers pause a claim and ask for more information electronically rather than denying it outright. N888 is the flag on the remittance that says a request of that kind went out. The remark does not list what was requested; the request itself does.

What to do

Locate the request through your clearinghouse, the payer portal, or electronic correspondence settings.
Read it closely for the documents or data requested and any deadline.
Reply through the channel the payer names, and label the response with the claim number.
Track the response date and follow up if the claim is not reprocessed.

Delays in answering can turn a pending claim into a denial. A shared work queue for payer requests keeps them from being missed.

Codes that may appear with N888

CO-252 (An attachment/other documentation is required to adjudicate this claim/service.): Documentation is required to adjudicate the claim.
CO-16 (Claim/service lacks information or has submission/billing error(s).): The claim lacks information needed for adjudication.

N886 (Alert: A Health Care Claim Request for Additional Information (277 RFAI) has been sent.): Names the specific transaction used: a 277 Request for Additional Information.
N179 (Additional information has been requested from the member.): The additional information was requested from the member, not from you.
N181 (Additional information is required from another provider involved in this service.): Additional information is required from another provider involved in the service.

N888 FAQ

How is N888 different from N886?

N886 names the 277 RFAI transaction specifically. N888 is broader and covers any electronic request, which could be a portal message or other electronic notice depending on the payer.

What if I never received a request?

Check your clearinghouse reports and the payer portal. If nothing is there, call the payer, confirm what it needs, and ask how to submit it.

Will the claim be paid automatically once I respond?

Usually the payer reviews the information and then reprocesses the claim. Follow up if you do not see an updated remittance within the payer's normal timeframe.

Important: read before using this information

This page is general educational information about a standard industry code set. It is not medical billing, coding, legal, reimbursement, or compliance advice, and it does not create a professional or advisory relationship with ClaimsRevenue.

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