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N852 Remark Code: Pay-To and Rendering TINs Don't Match

N852 means the tax identification number (TIN) of the pay-to provider doesn't match the TIN associated with the rendering provider. The payer expects the clinician who performed the service to be linked to the entity being paid, and on this claim they don't line up.

Quick facts

Code
N852 (RARC N852)
Status
Active In use since July 1, 2021.
Code set
Remittance Advice Remark Codes (RARC)
Group codes
  • CO (Contractual Obligation): The claim was denied for a provider data mismatch. It's the provider's to correct, not a patient balance.
Official description
The pay-to and rendering provider tax identification numbers (TINs) do not match
X12 Remittance Advice Remark Codes, retrieved September 25, 2026
Last verified
against the official X12 list.

What N852 means

A claim can identify several providers: the rendering clinician, the billing provider, and sometimes a separate pay-to provider. Payers keep records of which clinicians are enrolled under which tax IDs. N852 means that for this claim, the TIN tied to the pay-to provider doesn’t match the TIN the payer associates with the rendering provider.

It’s an enrollment and data consistency problem. The service may be fully covered, but the payer won’t pay an entity it can’t connect to the clinician who performed it. It usually appears with CARC 16.

Common causes

  • New clinician not yet linked to the group’s TIN with the payer.
  • Clinician works for more than one group, and the claim went out under a group the payer doesn’t associate with them.
  • Practice acquisition or TIN change where rosters weren’t updated.
  • Wrong TIN in box 25 or a pay-to address and TIN that belong to another entity.

How to fix it

  1. Confirm the TIN in box 25 and the billing provider in box 33 are correct for the entity that employs or contracts the clinician.
  2. Check the payer’s enrollment record for the rendering clinician to see which TIN they’re linked to.
  3. Update enrollment if the linkage is missing, for example a reassignment or roster update.
  4. Resubmit once the payer confirms the linkage, using a corrected claim with resubmission code 7 in box 22 if the claim was adjudicated.
  5. Watch timely filing while enrollment is pending. See timely filing denials.

How to prevent it

  • Complete payer linkage for every new clinician before their first date of service.
  • Update rosters with every payer after any TIN or ownership change.
  • See provider enrollment denials for an enrollment checklist.

Codes that may appear with N852

  • CO-16 (Claim/service lacks information or has submission/billing error(s).): A billing error; N852 names the TIN mismatch.
  • CO-208 (National Provider Identifier - Not matched.): The NPI and associated data don't match the payer's records.
  • N209 (Missing/incomplete/invalid taxpayer identification number (TIN).): The TIN itself is missing, incomplete, or invalid.
  • N799 (Submitted identifier must be an individual identifier, not group identifier.): A group identifier was used where an individual one is needed.
  • N836 (Provider W9 or Payee Registration not on file.): No W-9 or payee registration is on file for the payee.

N852 FAQ

Why would a rendering provider's TIN differ from the group's?

Usually because the clinician is enrolled with the payer under a different group, their own practice, or a prior employer, and hasn't been linked to the billing group's TIN.

How do I link a clinician to our group?

Through the payer's enrollment process, such as a reassignment of benefits for Medicare or a roster or credentialing update for commercial plans.

Can I just bill under a different provider?

No. The rendering provider must be the clinician who performed the service. Fix the enrollment linkage instead.