W5 Denial Code (Deactivated) – Use P16

W5 is a retired claim adjustment reason code. Payers stopped using it on 07/01/2014. Current remittances use P16 instead.

Seeing W5 on a Remittance?

W5 was retired effective 07/01/2014 and should not appear on new remittances.
Payers now report this situation with P16 — check that page for current guidance.
Official retirement note: Use code P16
If W5 appears on an old ERA you are reworking, interpret it per the remittance date, then follow the current code's guidance for any corrected claim.