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M101Remark Code (RARC)Deactivated

Effective 01/01/1997 · Stopped 01/31/2004

M101 Remark Code (Deactivated)

M101 is a retired remittance advice remark code. Payers stopped using it on 01/31/2004.

Seeing M101 on a Remittance?

M101 was retired effective 01/31/2004 and should not appear on new remittances.
Official retirement note: Consider using M78
If M101 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.