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N498 Remark Code: Impairment/Disability Report Invalid

N498 means the carrier received a medical permanent impairment or disability report but found it incomplete or invalid. The report may lack a required rating, method, or maximum medical improvement finding, may be unsigned, or may not address the body parts in the claim.

Code: N498 (RARC N498)
Status: Active In use since July 1, 2008.
Code set: Remittance Advice Remark Codes (RARC)
Group codes: CO (Contractual Obligation): The provider must correct the report. The adjustment is not transferred to the injured person.
Official description: Incomplete/invalid Medical Permanent Impairment or Disability Report.
X12 Remittance Advice Remark Codes, retrieved September 25, 2026
Last verified: September 24, 2026 against the official X12 list.

What N498 means

An impairment or disability report arrived, but the carrier rejected it. On workers’ compensation and similar claims, these reports feed directly into benefit calculations, so reviewers check them closely against state requirements. N498 is the incomplete-or-invalid companion to N497.

What usually goes wrong

No maximum medical improvement finding, or a finding with no date.
Rating method issues. The report does not say which method or edition was used, or uses one the jurisdiction does not accept.
Missing calculations. A final rating is given without the supporting measurements or math.
Scope mismatch. The report covers different body parts than the accepted claim, or omits one.
Authentication or authorship. Unsigned, or not signed by the evaluator who performed the exam.

How to fix it

Get the carrier’s specific objection from its explanation of review or the adjuster.
Have the evaluating physician amend the report, adding the missing findings, method, or calculations. Only the evaluator should change clinical conclusions.
Resubmit the amended report with the claim number and a note on what changed.
Rebill or request reconsideration of the evaluation according to state billing rules.
Use the state’s dispute process if the carrier’s objection is not supported by the jurisdiction’s rules.

How to prevent it

Keep a jurisdiction-specific checklist for impairment reports and review each report against it before it leaves the office. Evaluators who routinely perform ratings in several states benefit most, since requirements differ across borders.

Codes that may appear with N498

CO-251 (The attachment/other documentation that was received was incomplete or deficient.): The report was received but was deficient.
CO-16 (Claim/service lacks information or has submission/billing error(s).): The bill or report contained missing or invalid information.
CO-P13 (Payment reduced or denied based on workers' compensation jurisdictional regulations or payment policies, use only if no other code is applicable.): Used when the reduction or denial rests on workers' compensation jurisdictional rules.

N497 (Missing Medical Permanent Impairment or Disability Report.): No impairment or disability report was received.
N500 (Incomplete/invalid Medical Legal Report.): A medical-legal report, rather than an impairment report, is incomplete or invalid.
N206 (The supporting documentation does not match the information sent on the claim.): The supporting documentation does not match the bill.

N498 FAQ

What do carriers check in an impairment report?

Common elements include a statement on maximum medical improvement, the rating method and edition used, the rating for each affected body part, how the rating was calculated, work restrictions, and future medical needs. Requirements vary by jurisdiction.

What if the rating method was wrong?

If the state requires a particular rating method or edition and a different one was used, the report may need to be redone. Ask the carrier or check state rules.

Can the carrier refuse to pay for the evaluation?

It may hold or reduce payment until an acceptable report is received. If you disagree, use the jurisdiction's bill dispute process.

Important: read before using this information

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