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N20 Remark Code: Not Payable With Same-Day Service

N20 means the service is not payable when billed with another service rendered on the same date. The payer's edits treat the two services as a combination it will not pay separately, so one line is denied or reduced.

Code: N20 (RARC N20)
Status: Active In use since January 1, 2000.
Code set: Remittance Advice Remark Codes (RARC)
Group codes: CO (Contractual Obligation): The denied service is a provider write-off under the payer's editing rules and is generally not billable to the patient.
PR (Patient Responsibility): Occasionally a payer assigns the non-payable service to the patient. Confirm the plan terms and your contract before billing.
Official description: Service not payable with other service rendered on the same date.
X12 Remittance Advice Remark Codes, retrieved September 25, 2026
Last verified: September 24, 2026 against the official X12 list.

What N20 means

Payers maintain lists of services that should not both be paid when they happen on one date. Sometimes the reason is overlap (one service already includes the work of the other), sometimes the two are mutually exclusive (it would be clinically unlikely to perform both), and sometimes the payer’s policy simply limits same-day combinations. N20 is the general message for all of these: the line cannot be paid together with another service from the same day.

Look at the CARC to understand which type of conflict applies. CARC 97 and CARC 234 point to inclusion in another service, while CARC 231 indicates mutually exclusive procedures.

Common causes

A procedure pair hit an NCCI or payer edit and no qualifying modifier was reported.
An evaluation and management service was billed with a procedure without modifier 25, or with a modifier the notes did not support.
A service within a surgical global period was billed without the correct global modifier.
Two claims for the same date, perhaps from different locations in your group, were adjudicated together.

What to do

Identify the conflicting service. The remittance or payer portal may show which prior line triggered the edit.
Check the edit rule. Determine whether a modifier is allowed to bypass it, and under what circumstances.
Review documentation. If the services were distinct (separate session, site, or a significant separate evaluation), add the correct modifier and send a corrected claim with resubmission code 7.
Appeal if you believe the edit does not apply and a modifier fix is not available.
Write off the line if the payer’s rule applies and the services were not distinct.

How to prevent it

Build pre-bill edit checks for common same-day pairs in your specialty, and require notes to support any bypass modifier before release. For a detailed look at procedure-pair edits, read our NCCI and bundling guide.

Codes that may appear with N20

CO-97 (The benefit for this service is included in the payment/allowance for another service/procedure that has already been adjudicated.): The payment for this service is considered included in another service on that date.
CO-231 (Mutually exclusive procedures cannot be done in the same day/setting.): Mutually exclusive procedures cannot be done in the same day or setting.
CO-234 (This procedure is not paid separately.): The procedure is not paid separately.
CO-236 (This procedure or procedure/modifier combination is not compatible with another procedure or procedure/modifier combination provided on the same day…): The procedure or procedure-modifier combination conflicts with another service on the same day.

N19 (Procedure code incidental to primary procedure.): The procedure is incidental to a primary procedure, a narrower bundling explanation.
M15 (Separately billed services/tests have been bundled as they are considered components of the same procedure.): Separately billed services were combined as components of one procedure.
N390 (This service/report cannot be billed separately.): The service or report cannot be billed on its own.

N20 FAQ

Does N20 always involve the same provider?

Most same-day edits apply to one provider or group, but some payers apply them across providers in the same specialty or tax ID. Check the payer's policy for how it groups providers.

What about an office visit on the same day as a procedure?

A significant, separately identifiable evaluation on the same day as a minor procedure may be payable with modifier 25 when documentation supports it. Without that support, the visit is often denied as part of the procedure.

Can I split the services onto different claims to avoid N20?

No. Edits look at all claims for the same date, and splitting to avoid an edit is not appropriate. It can also trigger duplicate or overlap denials.

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