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N759 Remark Code: CT Payment Cut, NEMA XR-29 Standard

N759 means payment was adjusted based on the NEMA Standard XR-29-2013. This standard covers dose-related features of CT scanners, and Medicare reduces payment for CT services furnished on equipment that does not meet it.

Quick facts

Code
N759 (RARC N759)
Status
Active In use since July 1, 2015.
Code set
Remittance Advice Remark Codes (RARC)
Group codes
  • CO (Contractual Obligation): The reduction is a required payment adjustment the provider absorbs. It is not billable to the patient.
Official description
Payment adjusted based on the National Electrical Manufacturers Association (NEMA) Standard XR-29-2013.
X12 Remittance Advice Remark Codes, retrieved September 25, 2026
Last verified
against the official X12 list.

What N759 means

Federal law directed Medicare to reduce payment for computed tomography services performed on equipment that does not meet the National Electrical Manufacturers Association’s XR-29-2013 standard, which addresses radiation dose features. Providers report non-compliant equipment by adding modifier CT to the service line, and the payment for that line is reduced.

N759 is the remittance note explaining that reduction. Medicare’s instructions pair it with CARC 237 (legislated/regulatory penalty) under group code CO. Other payers that follow a similar approach may use a different reason code, such as CARC 45.

When to look closer

  • Your CT scanners have been upgraded or replaced and should be compliant.
  • Modifier CT is being added automatically for all CT services, including those on compliant equipment.
  • Only one location uses older equipment, but reductions appear on claims from all locations.

What to do

  1. Confirm the compliance status of the scanner used for the service.
  2. If compliant, remove modifier CT and submit a corrected claim with resubmission code 7.
  3. If non-compliant, the reduction is expected. Post it as a regulatory adjustment.
  4. Fix the charge master or claim rule so the modifier reflects the equipment actually used.

How to prevent it

Keep an equipment inventory that records each scanner’s XR-29 compliance and map it to the billing location. After equipment upgrades, update billing rules promptly. An ERA review of imaging lines can show whether N759 reductions are still appearing after an upgrade.

Codes that may appear with N759

  • CO-45 (Charge exceeds fee schedule/maximum allowable or contracted/legislated fee arrangement.): The allowed amount was lowered by the equipment-based reduction.
  • CO-237 (Legislated/Regulatory Penalty.): A legislated or regulatory penalty, the category this reduction falls into.
  • CO-223 (Adjustment code for mandated federal, state or local law/regulation that is not already covered by another code and is mandated before a new code…): An adjustment mandated by law or regulation.
  • N775 (Payment adjusted based on x-ray radiograph on film.): A similar technology-based reduction for x-rays taken on film.
  • N794 (Payment adjusted based on type of technology used.): Payment adjusted based on the type of technology used, for other imaging equipment.
  • M102 (Service not performed on equipment approved by the FDA for this purpose.): The service was not performed on equipment approved by the FDA for this purpose.

N759 FAQ

What is NEMA XR-29-2013?

It is an industry standard, sometimes called the Smart Dose standard, that defines dose-optimization and dose-check features for CT equipment.

How does the payer know our scanner is not compliant?

Medicare requires a specific modifier, CT, on claims for CT services furnished on non-compliant equipment. The reduction is applied to lines billed with it.

What if our scanner is compliant?

Then the modifier should not be on the claim. Remove it and send a corrected claim, and correct the charge master or billing rule that added it.