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N612 Remark Code: Not Authorized to Treat Injured Workers

N612 means the medical provider is not authorized or certified to provide treatment to injured workers in this jurisdiction. Some state workers' compensation systems require providers to be certified, registered, or part of an approved network before they can be paid.

Quick facts

Code
N612 (RARC N612)
Status
Active In use since July 15, 2013.
Code set
Remittance Advice Remark Codes (RARC)
Group codes
  • CO (Contractual Obligation): The provider isn't eligible to be paid by the workers' comp carrier. State law usually prevents billing the injured worker.
Official description
Medical provider not authorized/certified to provide treatment to injured workers in this jurisdiction.
X12 Remittance Advice Remark Codes, retrieved September 25, 2026
Last verified
against the official X12 list.

What N612 means

Workers’ compensation is run state by state, and some jurisdictions only pay providers who meet their requirements, such as holding a state certification, being registered with the workers’ compensation agency, or belonging to an approved medical network. N612 says the provider on this bill didn’t meet the requirement for the jurisdiction handling the claim.

It mirrors CARC P16 and may appear with CARC B7 or P25.

Common causes

  • The provider never applied for the jurisdiction’s certification or registration.
  • A certification lapsed or was not renewed.
  • The worker was treated outside the employer’s required network.
  • The claim is under another state’s jurisdiction than the provider expected, for example when the worker was hired in one state and injured in another.

What to do

  1. Confirm the jurisdiction and its provider requirements with the adjuster or the state agency.
  2. Check your status for the date of service.
  3. Apply or renew if eligible, and ask whether the approval can cover past dates.
  4. Transfer care to an authorized provider if you can’t become eligible, following state rules on changing treating providers.
  5. Don’t bill the worker for a compensable injury unless state law clearly allows it.

How to prevent it

Before scheduling a workers’ comp patient, confirm the claim’s jurisdiction, any network requirement, and your authorization status. See provider enrollment denials.

Codes that may appear with N612

  • CO-P16 (Medical provider not authorized/certified to provide treatment to injured workers in this jurisdiction.): The matching workers' compensation reason code: provider not authorized or certified in this jurisdiction.
  • CO-B7 (This provider was not certified/eligible to be paid for this procedure/service on this date of service.): The provider was not certified or eligible to be paid for the service.
  • CO-P25 (Payment adjusted based on Medical Provider Network (MPN).): Payment adjusted based on a Medical Provider Network.
  • N570 (Missing/incomplete/invalid credentialing data.): Credentialing data is missing, incomplete, or invalid.
  • N630 (Referral not authorized by attending physician.): The referral was not authorized by the attending physician.
  • N665 (Services by an unlicensed provider are not reimbursable.): Services by an unlicensed provider are not reimbursable.

N612 FAQ

Which states require certification to treat injured workers?

Requirements vary widely. Some states certify or register providers, some use employer networks, and some have neither. Check the workers' compensation agency where the injury claim is filed.

Can I bill the injured worker?

Generally not for a compensable injury. Many states prohibit balance billing injured workers.

Can a certification be applied retroactively?

Usually not, but rules differ. Ask the state agency or the carrier.