Which denial codes appear with N822?

N822 commonly rides with CO 16, CO 4, CO 236. The adjustment code says the claim was reduced; the remark code says why.

Remark code

N822 denial code

A modifier the payer needed was missing from the procedure.

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

Work out which modifier is missing before resubmitting. It is usually a laterality modifier, or one that separates two services billed the same day. Correct and resubmit; there is no decision here to appeal.

Codes it appears with

N822 commonly rides alongside these. Our reading, not a published mapping: X12 publishes no adjustment-to-remark table.

Code	What that one means
CO 16	Something the payer needed was missing or wrong on the claim.
CO 4	The procedure code and the modifier do not agree.
CO 236	This procedure and another one billed the same day cannot be billed together under NCCI.

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