Which denial codes appear with M80?

M80 commonly rides with CO 97, OA 18. The adjustment code says the claim was reduced; the remark code says why.

Remark code

M80 denial code

Another service billed for the same patient on the same day already absorbed this one.

Usually an appeal

A remark code is not the denial. The adjustment code says the claim was reduced. This one says why. You need both to know what to send back.

What to do

Decide first whether the two really were separate work. If they were, the modifier plus a note that documents the separate service is what wins it. If they were not, this is a correct denial and appealing it costs time you could spend on a winnable one.

Codes it appears with

M80 commonly rides alongside these. Our reading, not a published mapping: X12 publishes no adjustment-to-remark table.

Code	What that one means
CO 97	The payer says this is already paid inside another service.
OA 18	The payer treated this as an exact duplicate.

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