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N489 Remark Code: Referral Form Not Received

N489 means the payer requires a referral form for this service, usually from the patient's primary care provider or other referring provider, and it was not received. The claim is denied or held until the referral is supplied.

Quick facts

Code
N489 (RARC N489)
Status
Active In use since July 1, 2008.
Code set
Remittance Advice Remark Codes (RARC)
Group codes
  • CO (Contractual Obligation): The rendering provider was responsible for confirming the referral. Under most network contracts the amount cannot be shifted to the patient.
  • PR (Patient Responsibility): Some plans assign the amount to the patient when the member sought care without a required referral. Check the plan's rules and your contract before billing.
Official description
Missing referral form.
X12 Remittance Advice Remark Codes, retrieved September 25, 2026
Last verified
against the official X12 list.

What N489 means

HMOs, some point-of-service plans, many Medicaid managed care plans, and certain other products require members to get a referral before seeing a specialist or receiving particular services. The referral form documents that the gatekeeper provider sent the patient. N489 says the plan looked for that form and did not find it.

It commonly appears with CARC 288 (referral absent) or CARC 252 (attachment required).

Common causes

  • The patient self-referred and no referral was ever issued.
  • The primary care office issued the referral but did not send it to the plan or to the specialist.
  • The plan requires referrals to be entered in its portal, and only a paper copy exists.
  • The referral was issued to a different provider or practice than the one billing.

How to fix it

  1. Check the plan’s portal to see whether any referral exists for the patient, specialty, and dates.
  2. Contact the referring office if one is missing. Ask whether it can issue one and whether the plan accepts it for past dates.
  3. Submit the referral as the plan directs, then request reprocessing or file a corrected claim with the referring provider in box 17 and 17b.
  4. Appeal if a valid referral existed before the service and the plan failed to record it. Include proof of the original date.
  5. Decide on patient billing only after checking the plan’s rules and your contract, since many network agreements bar billing the member for this.

How to prevent it

Verify referral requirements at scheduling, not at check-in. The authorization and referral prevention guide walks through a front-end workflow that catches missing referrals before the visit.

Codes that may appear with N489

  • CO-288 (Referral absent): Referral absent, the reason code most directly tied to this remark.
  • CO-252 (An attachment/other documentation is required to adjudicate this claim/service.): An attachment is required; the missing attachment is the referral form.
  • CO-197 (Precertification/authorization/notification/pre-treatment absent.): Some payers treat the referral as a form of precertification and use this reason.
  • N490 (Incomplete/invalid referral form.): A referral form was received but was incomplete or invalid.
  • N475 (Missing completed referral form.): Missing completed referral form, a closely related remark.
  • N335 (Missing/incomplete/invalid referral date.): The referral date is missing or invalid.
  • CO-287 (Referral exceeded): A referral exists, but the services exceeded what it allowed.

N489 FAQ

Is a referral the same as a prior authorization?

No. A referral comes from a provider, often the primary care provider, sending the patient to another provider. A prior authorization is the payer's own approval. A plan can require one, both, or neither.

Can a referral be issued retroactively?

Some plans allow retroactive referrals within a limited window, and many do not. Check the plan's policy before asking the referring office.

Where does the referring provider go on a CMS-1500?

Box 17 holds the referring provider's name and box 17b the NPI. Some plans also want a referral number, and where it goes depends on the plan's instructions.