Skip to main content

N503 Remark Code: Work Status Report Missing

N503 means the carrier did not receive a work status report. The report states whether an injured worker can work, with what restrictions, and when they may return, and workers' compensation carriers often require it before paying for the visit.

Quick facts

Code
N503 (RARC N503)
Status
Active In use since July 1, 2008.
Code set
Remittance Advice Remark Codes (RARC)
Group codes
  • CO (Contractual Obligation): The treating provider must supply the report. The injured worker is not billed for this adjustment.
Official description
Missing Work Status Report.
X12 Remittance Advice Remark Codes, retrieved September 25, 2026
Last verified
against the official X12 list.

What N503 means

A workers’ compensation carrier pays two kinds of benefits: medical care and wage replacement. The work status report connects them. It tells the carrier and employer what the injured worker can do right now, which determines whether lost-time benefits continue and whether the employer can offer modified duty.

Because that information matters so much to the claim, many carriers want a work status report with each treating visit. N503 says one was expected and not received. It is a property and casualty remark.

Common causes

  • The provider documented restrictions in the chart but did not complete the separate form the state or carrier requires.
  • The work status slip was given to the patient or employer but never sent to the carrier.
  • The report was faxed to the adjuster while the bill went to a separate reviewer.
  • Work status was not addressed at the visit at all.

How to fix it

  1. Check the visit documentation for work status and restrictions on the date billed.
  2. Complete the required form if the state or carrier uses one, signed by the treating provider.
  3. Send it to the carrier with the claim number and date of service, and confirm the bill reviewer can see it.
  4. Request reprocessing of the bill, or rebill under the state’s rules.
  5. Send a copy to the employer if the jurisdiction or carrier requires it.

How to prevent it

Make the work status form a required step in the workers’ comp visit workflow, completed before the patient leaves. Attach it to the bill automatically. Clear, current restrictions also help the employer offer modified duty, which can shorten the claim.

Codes that may appear with N503

  • CO-252 (An attachment/other documentation is required to adjudicate this claim/service.): A required attachment is missing; the attachment is the work status report.
  • CO-16 (Claim/service lacks information or has submission/billing error(s).): The bill lacked information needed for adjudication.
  • CO-P1 (State-mandated Requirement for Property and Casualty, see Claim Payment Remarks Code for specific explanation.): A state-mandated property and casualty requirement was not met.
  • N504 (Incomplete/invalid Work Status Report.): The work status report was received but incomplete or invalid.
  • N495 (Missing Supplemental Medical Report.): A broader supplemental medical report is missing.
  • N501 (Missing Vocational Report.): A vocational report, prepared by a vocational specialist, is missing instead.

N503 FAQ

What goes in a work status report?

Usually whether the worker is off work, on modified duty, or at full duty; specific restrictions such as lifting limits or hours; the effective dates; and the next evaluation date. Some states have a required form.

How often is one needed?

Many carriers expect one after each visit where work status is addressed or changes. The exact requirement depends on the state and carrier.

Can the visit note serve as the work status report?

Sometimes, if it clearly states the work status and restrictions. Carriers that require a specific form will not accept a note alone.