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N550 Remark Code: Revalidate Enrollment or Face Hold

N550 is an alert that the provider or supplier has not responded to requests to revalidate enrollment information. If revalidation is not completed, the payer will place a payment hold in the near future.

Quick facts

Code
N550 (RARC N550)
Status
Active In use since March 6, 2012.
Code set
Remittance Advice Remark Codes (RARC)
Group codes
  • CO (Contractual Obligation): The alert does not change this claim's payment. It warns that future payments to the provider may be held.
Official description
Alert: You have not responded to requests to revalidate your provider/supplier enrollment information. Your failure to revalidate your enrollment information will result in a payment hold in the near future.
X12 Remittance Advice Remark Codes, retrieved September 25, 2026
Last verified
against the official X12 list.

What N550 means

Enrollment is not permanent. Medicare and other programs periodically ask providers and suppliers to confirm or update their information, a process called revalidation. N550 appears on a remittance when those requests have gone unanswered. The claim was processed, but the payer is warning that it will soon stop releasing payments.

Revalidation notices can go to a correspondence address or email that nobody monitors, so this alert may be the first sign a practice sees.

What to do

  1. Act immediately. Check the program’s enrollment system, for Medicare that is PECOS, for a pending revalidation request and its due date.
  2. Submit the revalidation with current information: practice locations, ownership, managing employees, reassignments, and bank details as required.
  3. Update correspondence addresses so future notices reach the right person.
  4. Confirm acceptance and keep the confirmation. If a hold has already started, ask the contractor how and when it will be released.
  5. Check other programs, such as Medicaid, that may have similar pending requests.

Put revalidation due dates on a compliance calendar for every enrolled provider and location. The provider enrollment guide covers enrollment maintenance in more detail.

Codes that may appear with N550

  • CO-45 (Charge exceeds fee schedule/maximum allowable or contracted/legislated fee arrangement.): A routine contractual adjustment often present on the processed claim carrying this warning.
  • N831 (You have not responded to requests to revalidate your provider/supplier enrollment information.): The non-alert version: you have not responded to revalidation requests.
  • N767 (The Medicaid state requires provider to be enrolled in the member's Medicaid state program prior to any claim benefits being processed.): A Medicaid state requires the provider to be enrolled before claims can be paid.
  • CO-B7 (This provider was not certified/eligible to be paid for this procedure/service on this date of service.): The provider was not eligible to be paid on the date of service, a likely result if enrollment lapses.

N550 FAQ

What is revalidation?

It is a periodic re-verification of a provider's or supplier's enrollment information. Medicare and many Medicaid programs require it on a recurring cycle and send notices when it is due.

Where do I revalidate?

For Medicare, revalidation is typically done through PECOS or the Medicare Administrative Contractor's process. Medicaid programs and other payers have their own portals.

What happens if I ignore it?

The alert says a payment hold is coming. Continued non-response can lead to deactivation of billing privileges, depending on the program.