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N76 Remark Code: Missing or Invalid Number of Riders

N76 means the number of riders reported on the claim was missing, incomplete, or invalid. It is typically associated with transportation claims, where payers need to know how many patients shared a trip so they can price it correctly.

Quick facts

Code
N76 (RARC N76)
Status
Active In use since January 1, 2000; last modified February 28, 2003.
Code set
Remittance Advice Remark Codes (RARC)
Group codes
  • CO (Contractual Obligation): The claim is denied as a correctable billing error. It is not the patient's responsibility.
  • PI (Payer Initiated Reduction): Some government payers use a payer-initiated adjustment for the same error.
Official description
Missing/incomplete/invalid number of riders.
X12 Remittance Advice Remark Codes, retrieved September 25, 2026
Last verified
against the official X12 list.

What N76 means

When one vehicle carries more than one patient, payers usually do not pay a full trip for each. They adjust base rates or mileage based on how many people rode together. To do that, they need the rider count on the claim. N76 says the count was absent, not a valid number, or inconsistent with other information the payer has.

The official description is brief, so the exact expectation depends on the payer. N76 is typically reported with CARC 16.

Common causes

  • The transport claim did not include a patient count where the payer requires one.
  • A multiple-patient trip was billed without the modifier or count the payer uses to identify shared trips.
  • The count differed across claims for the patients on the same trip.
  • The count was entered in an unexpected format or field.

How to fix it

  1. Check the trip record for how many patients were transported together and who they were.
  2. Review the payer’s rules on reporting patient counts and multiple-patient modifiers.
  3. Correct the claim with the right count and any required modifier, making sure all claims from the same trip agree.
  4. Submit a corrected claim with resubmission code 7, or follow the payer’s resubmission process.
  5. Contact the payer if its expectation for “riders” is not clear from its guide.

How to prevent it

Capture the number of patients in dispatch and trip reports for every run, and have your billing software require it for transport claims. Review shared trips as a group before billing so every patient’s claim reports the same count.

Codes that may appear with N76

  • CO-16 (Claim/service lacks information or has submission/billing error(s).): Required information is missing; N76 identifies the rider count.
  • N53 (Missing/incomplete/invalid point of pick-up address.): The point of pick-up address is missing or invalid.
  • N756 (Missing/incomplete/invalid point of drop-off address.): The point of drop-off address is missing or invalid.
  • N159 (Payment denied/reduced because mileage is not covered when the patient is not in the ambulance.): Mileage is not covered when the patient is not in the ambulance.

N76 FAQ

What does 'riders' mean on a claim?

The official text does not define it further. In transportation billing it generally refers to the number of patients carried together on a trip. If you are unsure what the payer expects, ask it directly.

How are multiple-patient trips billed?

Payers commonly require the patient count to be reported and may prorate payment among patients. Medicare uses a modifier to identify ambulance trips with multiple patients. Check the payer's transport billing guide.

Does N76 apply to single-patient trips?

It can, if the payer requires the count on every transport claim. Reporting a count of one where required avoids the error.