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M33Remark Code (RARC)Deactivated

Effective 01/01/1997 · Stopped 08/01/2004

M33 Remark Code (Deactivated)

M33 is a retired remittance advice remark code. Payers stopped using it on 08/01/2004.

Seeing M33 on a Remittance?

M33 was retired effective 08/01/2004 and should not appear on new remittances.
Official retirement note: Consider using M68
If M33 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.