HCPCS Level II modifier
Modifier MG
Modifier MG is a HCPCS Level II modifier. CMS describes it as: The order for this service does not have applicable appropriate use criteria in the qualified clinical decision support mechanism consulted by the ordering professional.
Source: CMS HCPCS Level II, October 2026 file dated September 23, 2026. Publisher page
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- Modifier
- MG
- Type
- HCPCS Level II modifier, maintained by CMS
- CMS description
- The order for this service does not have applicable appropriate use criteria in the qualified clinical decision support mechanism consulted by the ordering professional
- Claim form
- CMS-1500 item 24D, up to four modifiers per line. 837P SV101-3 to SV101-6.
- Guidance
- CMS HCPCS quarterly update
Related modifiers
- MHUnknown if ordering professional consulted a clinical decision support mechanism for this service, related information was not provided to the furnishing professional or provider
- MFThe order for this service does not adhere to the appropriate use criteria in the clinical decision support mechanism consulted by the ordering professional
- MSSix month maintenance and servicing fee for reasonable and necessary parts and labor which are not covered under any manufacturer or supplier warranty
- METhe order for this service adheres to appropriate use criteria in the clinical decision support mechanism consulted by the ordering professional
- N1Group 1 oxygen coverage criteria met
- MDOrdering professional is not required to consult a clinical decision support mechanism due to the significant hardship exception of extreme and uncontrollable circumstances
- N2Group 2 oxygen coverage criteria met
- MCOrdering 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
Related pages
Questions
What does modifier MG mean?
Modifier MG is a HCPCS Level II modifier. CMS describes it as: The order for this service does not have applicable appropriate use criteria in the qualified clinical decision support mechanism consulted by the ordering professional.
Is modifier MG a CPT or a HCPCS modifier?
MG is a HCPCS Level II modifier from the CMS quarterly HCPCS file. Two-digit numeric modifiers, such as 25 or 59, are CPT modifiers.
Where does modifier MG go on a claim?
On the CMS-1500 it goes in item 24D next to the procedure code. Each line holds up to four modifiers. On an 837P it goes in SV101-3 to SV101-6.
What denial comes back when a modifier is wrong?
A missing or mismatched modifier often comes back as CARC 4. A modifier that was not valid on the date of service comes back as CARC 182. A bundling edit the modifier should have bypassed comes back as CARC 97 or 236.