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N836 Remark Code: W-9 or Payee Registration Missing

N836 means the payer can't pay the claim because it doesn't have the provider's IRS Form W-9 or its payee registration on file. Once the payer receives and processes the form, the claim can be reprocessed or resubmitted.

Quick facts

Code
N836 (RARC N836)
Status
Active In use since November 1, 2020.
Code set
Remittance Advice Remark Codes (RARC)
Group codes
  • CO (Contractual Obligation): The claim wasn't paid because of a provider-side administrative gap. It isn't billable to the patient.
Official description
Provider W9 or Payee Registration not on file.
X12 Remittance Advice Remark Codes, retrieved September 25, 2026
Last verified
against the official X12 list.

What N836 means

Before a payer can send money, it needs to know who it is paying for tax purposes. A W-9 gives the payer your legal name and taxpayer identification number (TIN), and some payers also require a payee registration with banking and address details. N836 means neither is on file for the payee on your claim.

The claim may be clean in every other respect. The problem is administrative and sits on the payer’s vendor or payee file. It often appears with CARC 16.

Common causes

  • First claim to a new payer, such as an auto or workers’ compensation carrier or an out-of-network plan.
  • Name or TIN change after a practice acquisition, incorporation, or restructuring.
  • Expired or mismatched W-9 where the legal name doesn’t match IRS records for the TIN.
  • Claim billed under a different entity than the one that registered.

How to fix it

  1. Complete a current W-9 with the legal name exactly as the IRS has it for the TIN in box 25.
  2. Find the payer’s submission method, often a fax number, portal, or vendor registration site, and any payee registration form it requires.
  3. Send it with a cover note listing affected claim numbers.
  4. Confirm the payer has processed it, then ask whether claims will be reprocessed or must be resubmitted.
  5. Watch filing limits on claims waiting for the W-9. See timely filing denials.

How to prevent it

  • Keep a signed, current W-9 ready and send it with the first claim to any new payer that asks.
  • Update W-9s with all payers after any change to your legal name, TIN, or address.
  • Make sure the billing provider name and TIN in boxes 25 and 33 match your W-9.

Codes that may appear with N836

  • CO-16 (Claim/service lacks information or has submission/billing error(s).): Information needed for payment is missing.
  • CO-226 (Information requested from the Billing/Rendering Provider was not provided or not provided timely or was insufficient/incomplete.): Information requested from the billing provider wasn't provided.
  • N209 (Missing/incomplete/invalid taxpayer identification number (TIN).): The tax identification number on the claim is missing or invalid.
  • MA113 (Incomplete/invalid taxpayer identification number (TIN) submitted by you per the Internal Revenue Service.): The TIN submitted is incomplete or invalid according to the IRS.
  • N852 (The pay-to and rendering provider tax identification numbers (TINs) do not match): The pay-to and rendering provider TINs don't match.

N836 FAQ

Which payers ask for a W-9?

Any payer that pays you and reports payments to the IRS may need one, but N836 is especially common with payers you don't bill often, such as auto, workers' compensation, and out-of-network plans.

What is payee registration?

Some payers require providers to register as a payee, usually giving tax, banking, and address details, before they will issue payments. The process is payer specific.

Do I need to resubmit the claim?

Ask the payer. Some reprocess automatically once the W-9 is on file; others require a new submission.