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N3 Remark Code: Missing Consent Form

N3 means the payer could not pay because a required patient consent form was not received with the claim. Payers, including many Medicaid programs, require signed consent for certain procedures, such as sterilization, before they will pay.

Quick facts

Code
N3 (RARC N3)
Status
Active In use since January 1, 2000; last modified February 28, 2003.
Code set
Remittance Advice Remark Codes (RARC)
Group codes
  • CO (Contractual Obligation): The service is denied until the consent form is supplied. The provider cannot shift the charge to the patient while the paperwork problem is correctable.
  • PI (Payer Initiated Reduction): Some payers, such as Medicaid plans, report it as a payer-initiated reduction. It is still resolved by supplying a valid consent form.
Official description
Missing consent form.
X12 Remittance Advice Remark Codes, retrieved September 25, 2026
Last verified
against the official X12 list.

What N3 means

Certain procedures cannot be paid unless the patient has signed a specific consent document, and the payer needs a copy. N3 says that copy never reached the claim file. The payer is not questioning whether the service was medically appropriate; it simply has no proof that consent was obtained in the required form.

On the remittance, N3 usually explains CARC 16 (missing information) or CARC 252 (documentation required). When the claim indicated an attachment was coming but none arrived, CARC 163 may appear instead.

Common causes

  • The claim was sent electronically without the paperwork indicator or attachment control number that links it to a separately submitted form.
  • The facility had the signed form, but the surgeon, anesthesia group, or assistant billed separately without a copy.
  • The form was mailed or faxed to the wrong department or without the claim number.
  • The office did not know the payer required consent for that procedure.

How to fix it

  1. Locate the signed consent form in the hospital or surgical record. Every provider billing the procedure may need its own copy.
  2. Review it before sending. Check signatures, dates, and required waiting periods so you do not trade an N3 denial for an invalid-form denial.
  3. Submit the form the way the payer wants. That might be an electronic attachment tied to the claim, a portal upload, or a paper claim with the form attached.
  4. Resubmit if required. If the payer closed the claim, send a corrected claim (resubmission code 7 in box 22 on a CMS-1500) or a new claim, as instructed.

How to prevent it

  • Keep a payer-specific list of procedures that require consent forms.
  • Ask the facility for a copy of the signed form when scheduling, not after the service.
  • Hold claims for flagged procedures until the form is scanned into the account.

For broader guidance on missing-information denials, see the CO-16 deep dive.

Codes that may appear with N3

  • CO-16 (Claim/service lacks information or has submission/billing error(s).): Information needed to adjudicate is missing, and N3 identifies the consent form as that information.
  • CO-252 (An attachment/other documentation is required to adjudicate this claim/service.): An attachment is required, and N3 names the consent document as the required attachment.
  • CO-163 (Attachment/other documentation referenced on the claim was not received.): A consent form was referenced on the claim but never arrived at the payer.
  • N228 (Incomplete/invalid consent form.): The form was received but was incomplete or invalid, rather than missing entirely.
  • N28 (Consent form requirements not fulfilled.): The consent requirements themselves, such as timing or signatures, were not met.
  • N398 (Missing elective consent form.): Specifically targets a missing elective consent form.

N3 FAQ

Which procedures need a consent form?

It depends on the payer. Medicaid programs are well known for requiring a federal consent form for sterilization and an acknowledgment for hysterectomy, and other payers set their own lists.

Can I just fax the form after the denial?

Some payers accept the form through an attachment or documentation portal linked to the claim, while others want a new or corrected claim with the form attached. Follow the payer's instructions.

What if the form was signed but has an error?

Then the problem is an invalid form, not a missing one. Consent rules for some procedures do not allow a late signature to fix timing requirements, so check the payer's rules before resubmitting.