M80 remark code

Remittance advice remark code M80. Remark codes add detail to the reason code on the same claim line.

Not payable alongside an earlier service

Unofficial reference. This is our own plain-English explanation, not the official code text. Payer rules differ. Verify with the payer and the official X12 code list. AlphaPrefix is not affiliated with X12, CMS or any payer. Data last updated Nov 11, 2026.

What M80 means

Because another service for this patient was already processed for that session or date, the payer will not cover this one with it.

The payer already processed another service for the same patient on the same date or encounter and treats this one as not separately covered when done alongside it. It is a pairing rule, not a statement that the service itself is never covered.

It often comes with reason code 97 or 234. Look at which earlier claim it is being compared with.

Common causes

• Two services were billed for the same session when the payer's edit allows only one.
• The services were separate encounters but the claim did not show that, such as with a modifier.
• Another provider billed the paired service first for the same date.

What to do next

1. Find the earlier claim or line the payer matched this service against.
2. If the services were separate sessions, correct the claim with the supporting modifier and documentation.
3. If the edit is correct, post the line as not separately payable.

Related codes

• 97 (reason code) Service included in another payment
• M15 (remark code) Bundled into another service on the claim
• M86 (remark code) Similar service already paid recently