Which denial codes appear with N517?

N517 commonly rides with CO 16, CO 252. The adjustment code says the claim was reduced; the remark code says why.

Remark code

N517 denial code

The payer is asking for a new claim that includes the information it requested.

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

Find what was requested. The codes printed beside this one usually name it. Add it and submit a new claim. Do not appeal: the payer has asked for a resubmission, so an appeal only adds a wait while the filing clock keeps running.

Codes it appears with

N517 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 252	The payer wants supporting documentation attached.

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