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N63 Remark Code: Rebill Services on Separate Lines

N63 means the payer wants the services rebilled on separate claim lines. Something was combined on a single line, such as several dates, different modifiers, or distinct services, that the payer needs to see and price line by line.

Quick facts

Code
N63 (RARC N63)
Status
Active In use since January 1, 2000.
Code set
Remittance Advice Remark Codes (RARC)
Group codes
  • CO (Contractual Obligation): The line is denied as a billing format error for the provider to correct. It is not billable to the patient.
  • OA (Other Adjustment): Some payers report it as another adjustment because the line could not be processed as structured.
Official description
Rebill services on separate claim lines.
X12 Remittance Advice Remark Codes, retrieved September 25, 2026
Last verified
against the official X12 list.

What N63 means

On a professional claim, each service line (box 24 on the CMS-1500) should describe one service, usually on one date, with its own modifiers, units, and charge. When a single line bundles several things that the payer evaluates independently, the payer may deny it with N63 and ask for separate lines.

N63 typically appears with CARC 16, and sometimes with CARC 4 when modifiers are the issue.

Common causes

  • A date range was reported on one line when the payer requires one line per date of service.
  • Services that need different modifiers, such as left and right sides, were combined.
  • Units for a drug or supply were combined across different NDCs or strengths.
  • Different rendering providers’ services were combined under one line.
  • A bilateral service was reported in a format the payer does not accept.

How to fix it

  1. Check the payer’s line-level rules for the service: dates, modifiers, units, and bilateral reporting.
  2. Split the line so each has one date (where required), the correct modifier, and its share of units and charges.
  3. Update diagnosis pointers (box 24E) for each new line.
  4. Submit a corrected claim with resubmission code 7 and the original claim number.

How to prevent it

Configure charge entry so date spans and multiple modifiers generate separate lines for payers that require it. Units-related edits often overlap with line-structure edits; see MUE and units-of-service denials.

Codes that may appear with N63

  • CO-16 (Claim/service lacks information or has submission/billing error(s).): A billing error in how services were reported on the line.
  • CO-4 (The procedure code is inconsistent with the modifier used.): The procedure code and modifier combination on the line is inconsistent, often because separate modifiers needed separate lines.
  • N61 (Rebill services on separate claims.): Services must be rebilled on separate claims, not just separate lines.
  • N21 (Alert: Your line item has been separated into multiple lines to expedite handling.): Alert that the payer split a line itself to expedite handling.
  • N123 (Alert: This is a split service and represents a portion of the units from the originally submitted service.): Alert that a line is a split service carrying part of the original units.

N63 FAQ

Can I bill a range of dates on one line?

Some payers allow date spans for certain services with units totaled, while others require one line per date. N63 is a signal that this payer wants separate lines.

What about bilateral or multiple-site procedures?

Payers differ. Some want a single line with a bilateral modifier, others want two lines with right and left modifiers. Follow the payer's rule for the specific service.

Is this a corrected claim?

Usually yes. Send a corrected claim with resubmission code 7 that splits the line, unless the payer asks for a new claim.