RARC M80: Not Covered With a Previously Processed Service, Same Session or Date
RARC M80 means the service is not covered because it was performed during the same session or date as a service the payer already processed for the patient. It rides with CO-97 or CO-B15, and the outcome often depends on which of your claims reached the payer first.
- Type
- Informational (supplemental)
- Usually paired with
- CO-97, CO-B15
- Fixable?
- Sometimes — with a distinct-service modifier or reprocessing
- Typical fix
- Identify the earlier claim; add 59/25/X modifier if truly separate
What does remark code M80 mean?
Official X12 text: "Not covered when performed during the same session/date as a previously processed service for the patient." The payer already paid something for this patient on this date that, in its edit logic, conflicts with the line you billed. Your claim lost a race you may not have known you were in.
ERA mini-example: dermatology bills 17110 (wart destruction) at $160.00; it denies CO-97 with M80 because a 99213 from the same visit, sent on a separate claim, processed two days earlier and the payer bundled the procedure against it. Billed together with modifier 25 on the E/M, both would have paid.
Which denial code does M80 come with?
Usually CO-97 (included in payment for another service) and sometimes CO-B15 (qualifying service missing). The CARC frames it as bundling; M80 tells you the trigger was a same-session or same-date claim already on file. Decode the pair with the denial code lookup.
How do you fix an M80 denial?
- Identify the conflicting claim: call the payer or check the portal for what processed on that date, by whom.
- If it is your own split billing, decide which claim should carry the modifier — 25 on the E/M, or 59/X on the distinct procedure — and submit a corrected claim.
- If another provider's claim conflicts (common with global surgical packages and same-day facility services), evaluate whether your service was separately payable at all before appealing.
- Attach documentation showing separate sessions or sites when you resubmit.
How do you prevent M80?
Bill everything from one encounter on one claim, with modifiers applied at charge entry rather than at rework. Hold same-day charges until all departments have posted — a lab charge that goes out Tuesday can bundle Thursday's office claim. And when a patient reports a same-day service elsewhere (urgent care, specialist), note it: for services with same-date exclusions, being second in line is sometimes the whole story.
Frequently asked questions
A claim the payer adjudicated before yours arrived — from your own practice on a second claim for the same date, or from a completely different provider. Ask the payer rep for the CPT, provider, and processing date of the conflicting claim; you cannot evaluate the denial without knowing what beat you in.
If the services were genuinely distinct, yes. A same-day E/M denied against a procedure may warrant modifier 25 on the visit; two procedures in different sessions or sites may support 59 or an X modifier. Resubmit corrected with documentation. If the services truly overlap, the denial is correct and the balance is a write-off, not patient responsibility.
First-in wins. Payer systems process claims in arrival order, so when two claims for the same date conflict, whichever posted first pays and the later one draws M80 — regardless of dollar value. If the wrong one paid, you may need to request an adjustment of the paid claim before the denied one can reprocess.
Sources & further reading
Reviewed by the ImmediCare Solutions RCM team
Certified billers and coders handling claims across 50+ specialties nationwide. This entry is reviewed against current payer policy and CMS rules. Last review: Jul 5, 2026.
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