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N559 Remark Code: File Where Ordering Physician Is

N559 means this payer will not process the claim because the ordering physician is located outside its service area. You need to file the claim with the plan whose service area includes the ordering physician's practice location.

Quick facts

Code
N559 (RARC N559)
Status
Active In use since July 1, 2012.
Code set
Remittance Advice Remark Codes (RARC)
Group codes
  • CO (Contractual Obligation): The claim was filed with the wrong plan for this service. Do not bill the patient; send it to the plan serving the ordering physician.
  • OA (Other Adjustment): Reported as an other adjustment by some payers. It signals a filing-location problem, not a benefit determination.
Official description
This claim/service is not payable under our service area. The claim must be filed to the Payer/Plan in whose service area the Ordering Physician is located.
X12 Remittance Advice Remark Codes, retrieved September 25, 2026
Last verified
against the official X12 list.

What N559 means

Some payers split responsibility for claims geographically. For certain service types, the rule is that the plan covering the ordering physician’s location processes the claim, not the plan local to the provider who dispensed or performed the service. N559 says your claim reached a plan whose area does not include that physician.

This is most often seen on ancillary claims, for example specialty drugs dispensed by a pharmacy in one region for a physician who practices in another. It usually rides with CARC 109, or with CARC B11 when the payer has forwarded the claim for you.

Common causes

  • The dispensing provider billed its own local plan out of habit, but the order came from a physician in another plan’s territory.
  • The ordering provider fields were blank or wrong. Without an accurate ordering physician name and NPI (CMS-1500 box 17 and 17b), the payer may assign the wrong location.
  • The physician’s practice address changed and the claim reflects an old location.

How to fix it

  1. Pull the order or prescription and confirm the ordering physician’s name, NPI, and practice location.
  2. Determine the plan for that location using the payer’s ancillary claim guidance or by calling provider services.
  3. File a new claim with that plan, with complete ordering provider information.
  4. Keep the N559 remittance. If the correct plan questions timeliness, it shows when you first submitted. See timely filing denials.

How to prevent it

  • Capture the ordering physician’s location at order intake, not at billing.
  • Maintain a routing table that maps ancillary service types to the location rule each payer uses.
  • Validate ordering provider fields before release. Claims Validator can flag a blank or malformed ordering provider NPI before the claim goes out.

Codes that may appear with N559

  • CO-109 (Claim/service not covered by this payer/contractor.): The payer is not responsible for this claim; N559 identifies the ordering physician's location as the deciding factor.
  • CO-B11 (The claim/service has been transferred to the proper payer/processor for processing.): Appears when the payer has already transferred the claim to the correct plan.
  • N558 (This claim/service is not payable under our service area.): Uses the location where equipment was received instead of where the ordering physician practices.
  • N557 (This claim/service is not payable under our service area.): Uses the location where a specimen was collected.
  • N264 (Missing/incomplete/invalid ordering provider name.): The ordering provider's name is missing or invalid, which can stop the payer from locating the physician at all.

N559 FAQ

When does the ordering physician's location decide the plan?

Some payers assign certain ancillary services, such as specialty pharmacy drugs under Blue Cross Blue Shield ancillary rules, to the plan where the ordering physician is located. Check the plan's provider manual for which services follow this rule.

What if the ordering physician practices in several places?

Use the location tied to the order and make sure the ordering provider's name and NPI on the claim match that practice. If you are unsure which address the plan uses, ask provider services before refiling.

Can the patient be billed while this is sorted out?

No. N559 is a routing issue. Bill the correct plan first, then collect any patient responsibility it reports.