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N93 Remark Code: Separate Claim Needed per Place of Service

N93 means the claim mixed services furnished at different locations, and this payer requires a separate claim for each place of service. The services were not denied on their merits; they need to be split and resubmitted by location.

Quick facts

Code
N93 (RARC N93)
Status
Active In use since January 1, 2000.
Code set
Remittance Advice Remark Codes (RARC)
Group codes
  • CO (Contractual Obligation): The claim or lines were rejected for a billing-format reason. Do not bill the patient; correct and resubmit.
Official description
A separate claim must be submitted for each place of service. Services furnished at multiple sites may not be billed in the same claim.
X12 Remittance Advice Remark Codes, retrieved September 25, 2026
Last verified
against the official X12 list.

What N93 means

A professional claim can carry a place of service code on each line (CMS-1500 box 24B), and one service facility at the claim level (box 32). Some payers want every line on a claim to share one location. N93 tells you the payer found services from more than one site on the same claim and would not process them together.

N93 is usually attached to CARC 16 or a general denial. It is a formatting instruction, not a coverage decision.

Common causes

  • A provider who works at several locations had visits at a clinic and a facility combined on one claim.
  • Home visits and office visits for the same patient were batched together.
  • Services on different dates at different sites were grouped under one claim by the practice management system.
  • The place of service code was keyed wrong on one line, making the claim look multi-site.

How to fix it

  1. Sort the lines by location. Use the chart to confirm where each service was actually furnished.
  2. Correct any keying errors. If a line’s place of service code was simply wrong, fix it.
  3. Create one claim per site, each with the matching place of service on every line and the correct service facility name, address, and NPI in box 32 and 32a.
  4. Resubmit following the payer’s instructions for new versus replacement claims, and keep the original denial for reference in case timely filing is questioned. See the timely filing guide.

How to prevent it

Set your billing system to split claims automatically when the place of service or service facility changes. A pre-submission check that compares line-level place of service codes against the claim’s facility catches mixed-site claims before they go out; Claims Validator can run that kind of check.

Codes that may appear with N93

  • CO-16 (Claim/service lacks information or has submission/billing error(s).): The claim has a submission or billing error; N93 identifies mixed service locations as the error.
  • CO-A1 (Claim/Service denied.): A general claim denial that relies on N93 to explain what must change.
  • CO-5 (The procedure code/type of bill is inconsistent with the place of service.): The procedure is inconsistent with the place of service, which can accompany location problems on the same claim.
  • N149 (Rebill all applicable services on a single claim.): The opposite instruction: rebill all applicable services together on one claim.
  • M77 (Missing/incomplete/invalid/inappropriate place of service.): Flags a missing, invalid, or inappropriate place of service code on a line.
  • N428 (Not covered when performed in this place of service.): Denies a service because it is not covered in the place of service reported.

N93 FAQ

Can I just change the place of service codes on the lines?

Only if they were wrong. If the services really happened at different sites, each site needs its own claim with its own service facility information.

Should I use a corrected claim or new claims?

If the original was denied or rejected in full, payers usually want new claims for each location. If part was paid, ask the payer whether it wants a replacement for the paid portion and a new claim for the rest.

Does every payer require this?

No. Some payers accept line-level locations on one claim. N93 means this particular payer does not.