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N90 Remark Code: Covered Only for the Attending Physician

N90 means the service is covered only when the patient's attending physician performs it. The payer determined that the provider billing or rendering the service was not the attending physician on record, so the line was denied or adjusted.

Quick facts

Code
N90 (RARC N90)
Status
Active In use since January 1, 2000.
Code set
Remittance Advice Remark Codes (RARC)
Group codes
  • CO (Contractual Obligation): The denial is tied to who performed the service. It is generally a provider write-off unless the claim can be corrected to show the attending physician.
  • PR (Patient Responsibility): Less common. Patient liability applies only if the payer assigns it and any required advance notice rules were met.
Official description
Covered only when performed by the attending physician.
X12 Remittance Advice Remark Codes, retrieved September 25, 2026
Last verified
against the official X12 list.

What N90 means

Some services are payable only to the physician who holds the attending role for the patient. N90 tells you the payer compared the provider on your claim with the attending physician it has on file (or with what your claim reported) and found they did not match.

N90 normally explains a provider-eligibility reason code such as CARC 170 or CARC 185. It is about the role of the person performing the service, not the medical necessity of the service itself.

Common causes

  • A different physician in the group performed the service, and the claim correctly shows that person, but the payer limits the service to the attending physician.
  • The claim listed the wrong rendering provider, so it looks like a non-attending physician billed it.
  • The attending physician on the institutional claim or election statement differs from the physician on the professional claim.
  • The payer’s records show an outdated attending physician designation.

How to fix it

  1. Pull the record and confirm who performed the service and who was designated as attending on that date.
  2. If the rendering provider was keyed wrong, correct the rendering NPI (CMS-1500 box 24J) and send a corrected claim with resubmission code 7 in box 22 and the original claim number.
  3. If the attending designation on file is wrong, ask the facility or agency that holds the designation to update it, then request reprocessing.
  4. If a non-attending physician performed it, check whether the payer allows a covering-physician arrangement. If not, the line is typically a write-off.

How to prevent it

Before billing role-restricted services, match the rendering physician to the attending physician named on the admission, hospice election, or plan of care. Keep provider assignments in your scheduling and billing systems in sync. The provider enrollment and NPI guide covers related provider-data errors.

Codes that may appear with N90

  • CO-170 (Payment is denied when performed/billed by this type of provider.): Payment is denied when billed by this type of provider; N90 narrows it to the attending-physician requirement.
  • CO-185 (The rendering provider is not eligible to perform the service billed.): The rendering provider is not eligible to perform the service billed.
  • CO-283 (Attending provider is not eligible to provide direction of care.): The attending provider is not eligible to provide direction of care, a related role-based denial.
  • N95 (This provider type/provider specialty may not bill this service.): Denies a service because the provider type or specialty may not bill it at all.
  • N251 (Missing/incomplete/invalid attending provider taxonomy.): Flags missing or invalid attending provider taxonomy rather than the wrong physician.
  • MA94 (Did not enter the statement 'Attending physician not hospice employee' on the claim form to certify that the rendering physician is not an employee…): A hospice-specific remark about certifying that the attending physician is not a hospice employee.

N90 FAQ

Who counts as the attending physician?

It depends on the setting and payer. In inpatient, hospice, and similar settings it is typically the physician responsible for the patient's overall care, as designated in the record or election statement. Check the payer's definition for this service.

Can a covering physician bill the service?

Sometimes, under the payer's rules for substitute or covering arrangements. Those rules vary, so confirm them before rebilling under a different provider.

Should I appeal N90?

Appeal if the records show the rendering physician was in fact the attending physician and the payer's files are wrong. If another physician performed the service, an appeal is unlikely to succeed.