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M80 Remark Code: Not Covered With Earlier Same-Day Service

M80 means the service is not covered because it was performed during the same session or on the same date as another service the payer already processed for this patient. It usually reflects bundling or mutually exclusive procedure rules.

Code: M80 (RARC M80)
Status: Active In use since January 1, 1997; last modified October 31, 2002.
Code set: Remittance Advice Remark Codes (RARC)
Group codes: CO (Contractual Obligation): The denied service is a provider write-off under the payer's same-day rules unless it is proven distinct.
Official description: Not covered when performed during the same session/date as a previously processed service for the patient.
X12 Remittance Advice Remark Codes, retrieved September 25, 2026
Last verified: September 24, 2026 against the official X12 list.

What M80 means

M80 is driven by claim history. The payer already processed a service for this patient on the same date or in the same session, and under its rules the service on your current claim cannot also be covered. The earlier service may have been on another claim from your practice, on a claim from another provider, or on an earlier line the payer adjudicated first.

This is what makes M80 different from ordinary same-claim bundling: the conflict is with something already in the payer’s records.

Common causes

Two related services from the same encounter split across separate claims, so the second is denied as part of the first.
A procedure that is a component of, or mutually exclusive with, the already processed service.
An evaluation service on the same day as a procedure, without the modifier that shows it was significant and separately identifiable.
Different providers in the same group each billing parts of one session.

How to fix it

Find the earlier claim for the same patient and date and identify which service was processed.
Check the pairing against NCCI edits or the payer’s policy to see whether the two are allowed together.
If the services were distinct (separate session, anatomic site, or encounter), confirm the notes support it, add the right modifier, and send a corrected claim with frequency code 7.
If you split one encounter across claims by mistake, consider replacing the original claim so both services are reported together with the correct modifiers.
If the edit is valid, write off the denied amount.

How to prevent it

Bill all services from one encounter on a single claim.
Coordinate billing across providers in the same group seeing the patient on one day.
Review modifier guidance in the NCCI bundling guide.

Codes that may appear with M80

CO-97 (The benefit for this service is included in the payment/allowance for another service/procedure that has already been adjudicated.): Payment for this service is considered included in the service already adjudicated.
CO-234 (This procedure is not paid separately.): The procedure is not paid separately when billed with the earlier service.
CO-236 (This procedure or procedure/modifier combination is not compatible with another procedure or procedure/modifier combination provided on the same day…): The two procedures, or their modifiers, are not compatible on the same day under NCCI or payer rules.

N20 (Service not payable with other service rendered on the same date.): Similar same-day restriction, but not tied to the order in which claims were processed.
M15 (Separately billed services/tests have been bundled as they are considered components of the same procedure.): Separately billed services bundled as components of one procedure on the same claim.
M86 (Service denied because payment already made for same/similar procedure within set time frame.): A same or similar service already paid within a time frame, which is a frequency limit rather than a same-session edit.

M80 FAQ

Why does it matter that the other service was 'previously processed'?

The payer compares your claim to its history. If the other service came on a separate claim that was processed first, the later one is the line that gets denied.

Can a modifier fix M80?

Only if the services were truly distinct, such as a separate session, site, or encounter, and the documentation shows it. Then a modifier like 59 or an X modifier may apply.

What if a different provider billed the first service?

Same-day rules can still apply across providers in the same group or specialty. Check the payer's policy before assuming it is an error.

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