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N641 Remark Code: Paid by Number of Body Areas Rated

N641 means payment was calculated from the number of body areas the provider rated, which is how many workers' compensation fee schedules pay for impairment rating examinations. A lower payment usually means the payer counted fewer rated areas than you billed.

Quick facts

Code
N641 (RARC N641)
Status
Active In use since July 15, 2013.
Code set
Remittance Advice Remark Codes (RARC)
Group codes
  • CO (Contractual Obligation): The difference between the billed amount and the amount allowed for the recognized number of body areas is the provider's adjustment. Workers' compensation rules commonly prohibit billing the injured worker.
Official description
Reimbursement has been based on the number of body areas rated.
X12 Remittance Advice Remark Codes, retrieved September 25, 2026
Last verified
against the official X12 list.

What N641 means

When an injured worker’s condition stabilizes, a physician may perform an impairment rating: an examination that assigns a percentage of impairment to the affected parts of the body using the guides the jurisdiction adopts. Many workers’ compensation fee schedules pay this service in steps: a base amount for the exam plus an additional amount for each body area rated, sometimes with a cap.

N641 tells you the carrier used that step method. The paid amount reflects the number of body areas it recognized, not the total you charged.

Why the count can differ

  • Accepted body parts. The carrier may accept only some body parts as compensable. Rating a part it has not accepted may not be paid.
  • Report content. If the report does not show a full rating, with the method and result, for an area, the carrier may not count it.
  • Jurisdiction definitions. What counts as one area versus two, such as both sides of the body or several spinal regions, is set by the jurisdiction and can differ from how the rating guides divide the body.
  • Caps. Some schedules pay only up to a maximum number of areas.

What to do

  1. Read the explanation of review or remittance to see how many areas were paid.
  2. Compare to your report and the carrier’s list of accepted body parts for the claim.
  3. Supplement the report if an area was rated but the documentation was thin, and resubmit following the carrier’s rules.
  4. Request reconsideration if the carrier undercounted areas that were accepted and fully documented. Follow the jurisdiction’s billing dispute process if reconsideration fails.

How to prevent it

Before a rating exam, confirm the accepted body parts with the claims adjuster and document each area’s rating as a clearly separated section of the report. Keep the jurisdiction’s current fee schedule rules for impairment ratings on hand, since they change over time.

Codes that may appear with N641

  • CO-45 (Charge exceeds fee schedule/maximum allowable or contracted/legislated fee arrangement.): Reduction to the fee schedule amount for the body areas the payer recognized.
  • CO-162Deactivated (State-mandated Requirement for Property and Casualty, see Claim Payment Remarks Code for specific explanation.): A state-mandated property and casualty requirement, used when the jurisdiction's rule drives the pricing.
  • N654 (Adjusted based on achievement of maximum medical improvement (MMI).): Adjustment tied to the injured worker reaching maximum medical improvement, which is often when rating happens.
  • N591 (Payment based on an Independent Medical Examination (IME) or Utilization Review (UR).): Payment based on an independent medical examination or utilization review.
  • N621 (Charges for Jurisdiction required forms, reports, or chart notes are not payable.): Jurisdiction-required forms or reports that are not separately payable.

N641 FAQ

What is a body area in this context?

It is the unit of the rating, such as an upper extremity, the spine, or another region defined by the jurisdiction's rules. Each state or program defines what counts as a separate area and how many can be paid.

Why was I paid for fewer areas than I rated?

The payer may not have accepted all the areas as part of the compensable injury, or the report may not document a full rating for each one. Compare the report to the accepted body parts on the claim.

Does N641 apply to regular health insurance?

It is rarely relevant outside workers' compensation and similar injury systems, where impairment ratings determine benefits.