Which denial codes appear with MA04?

MA04 commonly rides with OA 22, OA 23. The adjustment code says the claim was reduced; the remark code says why.

Remark code

MA04 denial code

This was billed as a secondary claim and the payer has no record of what the primary did with it.

A correction, not 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

Attach the primary payer's remittance and resubmit. Do not appeal this one: nothing was decided, so there is no decision to argue with. Appealing spends the window on a claim that only needed a document.

Codes it appears with

MA04 commonly rides alongside these. Our reading, not a published mapping: X12 publishes no adjustment-to-remark table.

Code	What that one means
OA 22	Another plan should pay first.
OA 23	A prior payer already adjusted this, and that adjustment carries over.

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