Written and maintained by CASRAI Editorial Board
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Short answer: there is no single national “medical gas license.” Companies that make, fill, package, label or distribute medical gases work under two layers: federal registration with the FDA as a medical gas manufacturer, and a state permit, usually issued by the board of pharmacy. State rules such as Arizona’s R4-23-692 and Montana’s ARM 24.174.1204 write the FDA registration into the state application as a prerequisite. Check the rule of each state where you operate.
This page is general regulatory information, not legal advice.
Definition and scope: what people mean by a medical gas license
Searches for a “medical gas license” mix up three different things. Only the first is a distributor licence.
- State distributor permit. Permission from a state board to distribute, and in some states to make, transfill, package or label, compressed medical gas. This is the subject of this page.
- FDA registration and certification. Federal obligations for manufacturers of medical gases. In 2024 FDA finalised a rule that, in its words, establishes medical gas current good manufacturing practice (CGMP) requirements within 21 CFR part 213 and “codifies and clarifies the process for obtaining a certification to market designated medical gases” (89 FR 51738, published 18 June 2024, docket FDA-2021-N-1333).
- Piping installer or verifier certification. A separate credential tied to the installation and testing of in-building medical gas systems under NFPA 99. It has nothing to do with distributing cylinders or bulk gas. See medical gas piping and the NFPA 99 health care facilities code.
How the two layers work in practice
The Arizona and Montana rules, as checked on 2026-10-31, show the same structure: a federal step first, then a state permit.
- Arizona R4-23-692(A)(1) prohibits making, processing, transfilling, packaging or labeling compressed medical gas in the state “without a current Board-issued resident or nonresident compressed medical gas distributor permit.” The rule reaches out-of-state operators who ship into Arizona.
- R4-23-692(A)(2) requires an applicant to “register with the FDA as a medical gas manufacturer” and comply with federal drug listing requirements before operating.
- Montana ARM 24.174.1204 requires a medical gas distributor to register annually with the board as a wholesale drug distributor with a medical gas endorsement, and to “provide proof of registration with the Food and Drug Administration (FDA) as a medical gas manufacturer.”
In both states the application is made on a form furnished or prescribed by the board, with a fee. Fee amounts and processing times are set by each board and are not covered here.
Medical gas distributor license and medical oxygen distributor license compared across two states
The table compares only what the two rule texts say. The permit names refer to medical gas in general; neither rule creates a separate oxygen-only category, so a “medical oxygen distributor license” is, on these texts, a medical gas permit that covers oxygen.
| Item | Arizona R4-23-692 | Montana ARM 24.174.1204 |
|---|---|---|
| Permit name | Resident or nonresident compressed medical gas distributor permit | Registration as a wholesale drug distributor with a medical gas endorsement |
| FDA step required first | Register with FDA as a medical gas manufacturer; comply with drug listing | Proof of FDA registration as a medical gas manufacturer; comply with FDA requirements |
| Application | Completed form furnished by the Board, plus fee | Form prescribed by the board, plus registration fee |
| Out-of-state operators | Nonresident permit; a copy of the equivalent license or permit from the home jurisdiction | No separate provision stated |
| Inspection and records | Facility available to the Board; a nonresident permittee provides its most recent home-state inspection report within 10 days of a Board request | Records kept at least two years after distribution and readily available to the board, its inspector or the FDA |
| Display | No display provision stated | Endorsement posted in a conspicuous place at the place of business |
Where it matters for labs, clinics and supply decisions
The rules are written around who makes, fills, packages, labels or distributes the gas, so the permit sits with the supplier. Arizona’s rule applies to operators shipping into the state, so a supplier located elsewhere still needs the Arizona permit. Montana requires the endorsement to be displayed at the wholesaler’s premises and records to be open to the board, its inspector or the FDA. For a lab or clinic, that makes a supplier’s state permit and FDA registration documents that can be requested from the supplier. The two rules do not tell buyers what to ask for, so this page does not prescribe a checklist.
FDA’s 2024 rule also changed some labeling: it includes limited part 201 changes such as “no smoking” and “no vaping” statements and a graphic warning symbol on oxygen containers. For how cylinders are marked, see oxygen cylinder label. For cylinder dimensions and connections, see compressed gas cylinder sizes and CGA fittings.
Common misunderstandings
“One license covers every state.”
Both rules are state rules. Arizona asks nonresident applicants for a copy of the equivalent permit from their home jurisdiction; it does not treat that permit as a substitute for an Arizona one.
“The FDA registration is the license.”
In Arizona and Montana the FDA registration is a prerequisite to the state permit, not a replacement for it.
“Medical gas CGMP is in 21 CFR part 211.”
FDA’s 2024 final rule places medical gas CGMP requirements in 21 CFR part 213.
“Piping certification is the same as a distributor license.”
It is not. NFPA 99 governs in-facility systems; the permits above govern companies that make and distribute the gas.
FAQ
Do I need a license to distribute medical oxygen?
In states with rules like Arizona’s and Montana’s, yes: a medical gas permit or endorsement from the state board, after federal FDA registration as a medical gas manufacturer. Confirm the rule in each state where you ship from or to.
Who issues a medical gas distributor license?
In Arizona and Montana, the state board, which accepts the application on its own form. Arizona’s rule names the Board as issuer; Montana’s names the board for registration.
Does an out-of-state supplier need a license?
Arizona’s rule covers nonresident operators and asks for a copy of the equivalent license or permit from the home jurisdiction.
How long are distribution records kept?
Montana requires at least two years after distribution. Other states set their own periods.
Sources
- Arizona Administrative Code R4-23-692, Compressed Medical Gas Distributor, via Cornell LII, checked 2026-10-31.
- Montana ARM 24.174.1204, Medical gas distributor, via Cornell LII, checked 2026-10-31.
- FDA, Current Good Manufacturing Practice, Certification, Postmarketing Safety Reporting, and Labeling Requirements for Certain Medical Gases (89 FR 51738, 18 June 2024), checked 2026-10-31.
