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D21Denial Code (CARC)Deactivated

Effective 01/01/1995 · Stopped 06/30/2007

D21 Denial Code (Deactivated)

D21 is a retired claim adjustment reason code. Payers stopped using it on 06/30/2007.

Seeing D21 on a Remittance?

D21 was retired effective 06/30/2007 and should not appear on new remittances.
If D21 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.