HCPCS modifier codes starting with M

10 codes. Every code ever valid for billing is listed, including those now retired.

Code	Description	Status
M2	Medicare secondary payer (msp)	Valid
MA	Ordering professional is not required to consult a clinical decision support mechanism due to service being rendered to a patient with a suspected or confirmed emergency medical condition through FY2026	Terminated
MB	Ordering professional is not required to consult a clinical decision support mechanism due to the significant hardship exception of insufficient internet access through FY2026	Terminated
MC	Ordering professional is not required to consult a clinical decision support mechanism due to the significant hardship exception of electronic health record or clinical decision support mechanism vendor issues through FY2026	Terminated
MD	Ordering professional is not required to consult a clinical decision support mechanism due to the significant hardship exception of extreme and uncontrollable circumstances through FY2026	Terminated
ME	The order for this service adheres to appropriate use criteria in the clinical decision support mechanism consulted by the ordering professional through FY2026	Terminated
MF	The order for this service does not adhere to the appropriate use criteria in the clinical decision support mechanism consulted by the ordering professional through FY2026	Terminated
MG	The order for this service does not have applicable appropriate use criteria in the qualified clinical decision support mechanism consulted by the ordering professional through FY2026	Terminated
MH	Unknown if ordering professional consulted a clinical decision support mechanism for this service, related information was not provided to the furnishing professional or provider through FY2026	Terminated
MS	Six month maintenance and servicing fee for reasonable and necessary parts and labor which are not covered under any manufacturer or supplier warranty	Valid