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A4Denial Code (CARC)Deactivated

Effective 01/01/1995 · Updated 09/30/2007 · Stopped 04/01/2008

A4 Denial Code (Deactivated)

A4 is a retired claim adjustment reason code. Payers stopped using it on 04/01/2008.

Seeing A4 on a Remittance?

A4 was retired effective 04/01/2008 and should not appear on new remittances.
If A4 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.