N1 HCPCS Level II modifier: Group 1 oxygen coverage criteria met
N1 is a HCPCS Level II modifier: “Group 1 oxygen coverage criteria met.” It adds this detail to the code it is reported with.
Official description
N1Group 1 oxygen coverage criteria met
Short description: Group 1 oxygen cov crit met
HCPCS · United States
Medicare details
The indicators CMS publishes with N1 in its October 2026 file. They describe Medicare’s handling, not another payer’s.
- Medicare coverage
- Carrier judgment
- Added
- Jan 1, 2023
Where N1 sits
- 1GroupHCPCS modifiers
- 2Modifier N1Group 1 oxygen coverage criteria met
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 N1 mean?
N1 is the HCPCS code for “Group 1 oxygen coverage criteria met” in CMS’s HCPCS Level II October 2026 release.
Where is N1 in the HCPCS Level II list?
N1 is listed under Modifiers.
Does Medicare cover N1?
CMS lists N1’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 N1
All modifiersMDOrdering 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 professionalMGThe order for this service does not have applicable appropriate use criteria in the qualified clinical decision support mechanism consulted by the ordering professionalMHUnknown if ordering professional consulted a clinical decision support mechanism for this service, related information was not provided to the furnishing professional or providerMSSix month maintenance and servicing fee for reasonable and necessary parts and labor which are not covered under any manufacturer or supplier warrantyN2Group 2 oxygen coverage criteria metN3Group 3 oxygen coverage criteria metNBNebulizer system, any type, fda-cleared for use with specific drugNRNew when rented (use the 'nr' modifier when dme which was new at the time of rental is subsequently purchased)NUNew equipmentP1A normal healthy patient