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N800 Remark Code: Only One Service Date Per Claim

N800 means the payer only allows one date of service on a claim for this type of billing, and the claim you sent contained more than one. Split the services into separate claims, one per date of service, and resubmit.

Quick facts

Code
N800 (RARC N800)
Status
Active In use since March 1, 2018.
Code set
Remittance Advice Remark Codes (RARC)
Group codes
  • CO (Contractual Obligation): The claim was rejected or denied for how it was structured. The provider resubmits; the patient is not responsible.
Official description
Only one service date is allowed per claim.
X12 Remittance Advice Remark Codes, retrieved September 25, 2026
Last verified
against the official X12 list.

What N800 means

Most professional claims can list services from different dates, one date per line. Some payers, or specific programs within a payer, don’t allow that. They require every claim to cover a single date of service so each encounter is adjudicated on its own. When a claim arrives with two or more different dates, the payer returns N800, usually with CARC 16.

The app guidance for this code is short and accurate: split the claim so there is one claim per date of service.

Common causes

  • Batch billing. A week or month of visits for the same patient is billed on one claim for convenience.
  • Recurring services. Therapy, home-based, or behavioral health services with several sessions entered together.
  • System settings. The practice management system groups all open charges for a patient onto one claim regardless of payer rules.
  • Different rules between programs. A payer’s commercial line allows multiple dates, but its Medicaid managed care or special program does not.

How to fix it

  1. List the dates on the denied claim and the services under each.
  2. Create one claim per date. Each claim should carry only the lines for that date in box 24A, with its own charges and units.
  3. Check whether the original needs voiding. If the multi-date claim was adjudicated, ask the payer whether to void it before sending the split claims, to avoid duplicate denials.
  4. Submit each claim as an original and watch for all of them on the next remittance.
  5. Mind the filing limit. Split claims are usually judged against timely filing on their own, so don’t let them sit. See timely filing denials.

How to prevent it

  • Add a payer-level rule in your billing system that creates one claim per date of service for the payers and programs that require it.
  • Flag the payers that use N800 in your payer rules list so new staff know about them.
  • Use Claims Validator to catch multi-date claims going to single-date payers before submission.

Codes that may appear with N800

  • CO-16 (Claim/service lacks information or has submission/billing error(s).): A submission or billing error; N800 says the error is multiple dates on one claim.
  • CO-267 (Claim/service spans multiple months.): The claim spans multiple months, a related date-structure problem.
  • N812 (The start service date through end service date cannot span greater than 18 months.): A claim's service dates span too long a period, rather than too many individual dates.
  • N62 (Dates of service span multiple rate periods.): Dates of service cross rate periods and must be split for that reason.
  • CO-268 (The Claim spans two calendar years.): The claim spans two calendar years and must be split by year.

N800 FAQ

Doesn't the CMS-1500 allow six lines with different dates?

The form does, and many payers accept it. N800 means this payer, or this program within the payer, has a stricter rule for the service type billed.

Should I void the original claim before splitting it?

If the claim was rejected, just send the split claims as new originals. If it was adjudicated and is on the payer's system, ask whether it wants the original voided first so the new claims aren't flagged as duplicates.

Will splitting claims affect payment for services billed together?

It can, if a service on one date depends on a related service on another. Keep documentation handy and mention the relationship in box 19 if the payer allows.