D12 Denial Code (Deactivated) – Use 17

D12 is a retired claim adjustment reason code. Payers stopped using it on 10/16/2003. Current remittances use 17 instead.

Seeing D12 on a Remittance?

D12 was retired effective 10/16/2003 and should not appear on new remittances.
Payers now report this situation with 17 — check that page for current guidance.
Official retirement note: Use code 17.
If D12 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.