M2 HCPCS Level II modifier: Medicare secondary payer (msp)
M2 is a HCPCS Level II modifier: “Medicare secondary payer (msp).” It adds this detail to the code it is reported with.
Official description
M2Medicare secondary payer (msp)
Short description: Medicare secondary payer
HCPCS · United States
Medicare details
The indicators CMS publishes with M2 in its October 2026 file. They describe Medicare’s handling, not another payer’s.
- Medicare coverage
- Carrier judgment
- Added
- Jan 1, 2007
Where M2 sits
- 1GroupHCPCS modifiers
- 2Modifier M2Medicare secondary payer (msp)
Source and release
- Data release
- HCPCS Level II · October 2026
- Effective date
- Oct 1, 2026
- Publisher
- CMS
This page is built from the HCPCS Level II catalog that Vero Codes reads when it suggests codes: Centers for Medicare & Medicaid Services’s October 2026 release, imported from the publisher’s file and checked against it. The description, notes and structured data come from the same record.
Frequently asked questions
What does HCPCS code M2 mean?
M2 is the HCPCS code for “Medicare secondary payer (msp)” in CMS’s HCPCS Level II October 2026 release.
Where is M2 in the HCPCS Level II list?
M2 is listed under Modifiers.
Does Medicare cover M2?
CMS lists M2’s Medicare coverage as “Carrier judgment”. Coverage and payment still depend on the patient, the setting, the documentation and the payer.
Which HCPCS Level II release does this page use?
It uses CMS’s October 2026 release, in effect from Oct 1, 2026 to Dec 31, 2026. It is a reference: confirm the code against the current list and the payer’s rules before you submit it.
Codes beside M2
All modifiersLLLease/rental (use the 'll' modifier when dme equipment rental is to be applied against the purchase price)LMLeft main coronary arteryLRLaboratory round tripLSFda-monitored intraocular lens implantLTLeft side (used to identify procedures performed on the left side of the body)LUFractionated paymentMAOrdering 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…MBOrdering professional is not required to consult a clinical decision support mechanism due to the significant hardship exception of insufficient internet accessMCOrdering professional is not required to consult a clinical decision support mechanism due to the significant hardship exception of electronic health record or clinical decision…MDOrdering professional is not required to consult a clinical decision support mechanism due to the significant hardship exception of extreme and uncontrollable circumstancesMEThe order for this service adheres to appropriate use criteria in the clinical decision support mechanism consulted by the ordering professionalMFThe order for this service does not adhere to the appropriate use criteria in the clinical decision support mechanism consulted by the ordering professional