Operating a hyperbaric chamber legally is less about a single license and more about a stack of credentials, facility approvals, and safety-code compliance that have to line up. To operate a hyperbaric chamber in a clinical setting, you need a licensed physician directing the program, certified staff running the equipment, a state-licensed facility that meets NFPA 99 and ASME PVHO-1 safety standards, and, in most cases, UHMS accreditation to satisfy insurers. Even a soft-sided chamber for personal use requires a physician’s prescription, because the FDA regulates every hyperbaric chamber as a Class II prescription medical device.1eCFR. 21 CFR 868.5470 – Hyperbaric Chamber2eCFR. 21 CFR 801.109 – Prescription Devices
What that stack looks like for you depends on whether you’re the physician overseeing treatment, a technician at the controls, a facility owner, or someone buying a chamber for home use.
Physician Credentials to Supervise Hyperbaric Treatment
A licensed physician has to direct any clinical hyperbaric oxygen therapy program. The strongest credential is board certification in Undersea and Hyperbaric Medicine through the American Board of Medical Specialties or the American Osteopathic Association. Physicians who aren’t board-certified can qualify by completing a UHMS-designated 40-hour introductory course in hyperbaric medicine.3Undersea & Hyperbaric Medical Society. Approved UHMS Introductory Courses
The UHMS Program for Advanced Training in Hyperbaric Medicine (PATH) offers deeper education for physicians, nurse practitioners, and physician assistants, though UHMS is clear that PATH “does not replace fellowship training or board certification.”4Undersea & Hyperbaric Medical Society. UHMS Program for Advanced Training in Hyperbaric Medicine For anyone seeking UHMS accreditation “with distinction,” the medical director must be board-certified in UHM.5Undersea & Hyperbaric Medical Society. Clinical Hyperbaric Facility Accreditation Manual, Fourth Edition
Certifications for Staff Running the Chamber
The people at the controls during treatment are typically certified hyperbaric technologists or nurses. The National Board of Diving and Hyperbaric Medical Technology (NBDHMT) administers both credentials.
A Certified Hyperbaric Technologist (CHT) has completed a formal training course in hyperbaric technology, finished a supervised preceptorship, and passed the CHT examination.6National Board of Diving & Hyperbaric Medical Technology. Certified Hyperbaric Technologist Training and Certification A Certified Hyperbaric Registered Nurse (CHRN) needs a current unrestricted RN license, at least two years of clinical experience (or one year of critical care experience), one year of active hyperbaric medicine experience, a 40-hour approved training course, and 480 hours of direct hyperbaric patient care under a CHRN preceptor.7National Board of Diving & Hyperbaric Medical Technology. Certified Hyperbaric Registered Nurse Resource Manual
State law doesn’t always mandate these certifications, but they’re effectively required in practice. UHMS accreditation standards call for “at least one CHRN or CHT is on duty in the clinical area at all times when a patient is receiving hyperbaric treatment.”5Undersea & Hyperbaric Medical Society. Clinical Hyperbaric Facility Accreditation Manual, Fourth Edition Hospitals and wound care centers rarely let anyone operate the chamber without one of these credentials.
Facility Licensing and UHMS Accreditation
Qualified staff isn’t enough on its own. State health departments require outpatient medical facilities to hold operating licenses, and a hyperbaric center has to meet whatever standards apply to its category, whether that’s a hospital outpatient department, ambulatory surgical center, or freestanding clinic. Requirements and fees vary by state.
Voluntary UHMS accreditation carries real practical weight on top of state licensing. To qualify for an accreditation survey, a facility must have been providing hyperbaric treatments for at least one year, operate under the direction of a physician, and be “in conformance with applicable federal, state and local laws and regulations.”5Undersea & Hyperbaric Medical Society. Clinical Hyperbaric Facility Accreditation Manual, Fourth Edition The survey covers equipment, staff qualifications, safety protocols, quality improvement programs, and emergency procedures.
The FDA itself has pointed patients and facilities toward UHMS-accredited centers for treatment of specific conditions, and many insurers look for that accreditation when deciding coverage.8Undersea & Hyperbaric Medical Society. FDA Recommends UHMS-Accredited Hyperbaric Facilities for Treatment of Specific Illnesses That makes accreditation optional on paper and something close to essential in practice.
Safety Codes Your Facility Has to Meet
Fire is the dominant risk in hyperbaric medicine, and the FDA has issued safety communications to providers specifically about fire risk during HBOT.9U.S. Food and Drug Administration. Follow Instructions for Safe Use of Hyperbaric Oxygen Therapy Devices – Letter to Health Care Providers Two standards shape what any operating chamber has to comply with.
NFPA 99, Chapter 14, covers hyperbaric facilities in detail. It sorts chambers into Class A (multiplace), Class B (single occupant), and Class C (animal only). Core requirements include:
- Two-hour fire-resistant-rated construction protecting any Class A chamber inside a building (Class B and C are exempt).
- A hydraulically calculated automatic wet pipe sprinkler system or water mist fire protection system in the room housing any class of chamber.
- Exclusive use of the room housing a Class A or B chamber during hyperbaric procedures.
- Category 1 medical gas system reliability where interruption could cause major injury or death.10NFPA. NFPA 99, Chapter 14 – Hyperbaric Facilities
The ASME PVHO-1 standard governs design, fabrication, and testing of pressure vessels for human occupancy, applying to any chamber with a pressure differential exceeding 2 PSI.11ASME. PVHO-1 – Safety Standard for Pressure Vessels for Human Occupancy Roughly eleven states have enacted statutes mandating PVHO-1 compliance for clinical hyperbaric chambers. In states without an explicit mandate, hospitals and insurers still treat PVHO-1 compliance as a baseline expectation.
Extra Requirements If You Bill Medicare
Billing Medicare adds another layer on top of licensing. Medicare covers hyperbaric oxygen therapy only for the conditions listed in National Coverage Determination 20.29, which include acute carbon monoxide or cyanide poisoning, decompression illness, gas embolism, gas gangrene, crush injuries, acute traumatic peripheral ischemia, progressive necrotizing infections, compromised skin grafts, acute peripheral arterial insufficiency, chronic refractory osteomyelitis, osteoradionecrosis, soft tissue radionecrosis, and Wagner grade III or higher diabetic lower-extremity wounds after at least 30 consecutive days of standard wound therapy have shown no measurable healing.12Centers for Medicare & Medicaid Services. National Coverage Determination – Hyperbaric Oxygen Therapy For diabetic wounds, treatment must be re-evaluated every 30 days, and coverage stops if a 30-day period passes without measurable improvement.
Physician supervision requirements depend on where the treatment happens. In hospital outpatient departments, CMS moved the required supervision level from direct to general under the CY 2020 Hospital Outpatient Prospective Payment System Final Rule, meaning the physician maintains overall direction and control without needing to be physically present during treatment. In a physician’s office, direct supervision still applies: the physician has to be present in the office suite and immediately available, though not in the treatment room itself.
Home and Wellness Use
Buying a hyperbaric chamber for personal use is legal, but still requires a prescription. Even mild chambers operating at 1.3 ATA that use compressed ambient air rather than pure oxygen fall under the Class II designation, and 21 CFR 801.109 makes no exception for home or wellness use.2eCFR. 21 CFR 801.109 – Prescription Devices A physician, dentist, or other licensed practitioner has to write the prescription before a manufacturer or distributor can legally sell you the device.
Safety at home is your responsibility once the chamber is delivered. Static electricity in an oxygen-enriched environment can start a fire, so cotton clothing and no electronics or flammable products inside the chamber are the baseline. Assembly, grounding, and ventilation instructions from the manufacturer aren’t optional. And nobody is monitoring you for barotrauma or checking contraindications like ear infections, certain lung conditions, or claustrophobia the way clinical staff would.
Wellness centers and sports recovery businesses offering hyperbaric sessions occupy a gray area. The device still needs a prescription, and advertising it for any condition the FDA hasn’t cleared is a regulatory violation. Some operators work with a physician who writes standing orders or prescriptions for clients, which technically satisfies the federal requirement. Others operate without that arrangement and are taking a legal risk, even where enforcement has been inconsistent.
Where Operators Actually Get in Trouble
The FDA has stated it “is aware there are some hyperbaric oxygen treatment centers promoting hyperbaric oxygen chambers for uses that have not been cleared or approved by the FDA, such as treatment of cancer, Lyme disease, autism, or Alzheimer’s disease.”8Undersea & Hyperbaric Medical Society. FDA Recommends UHMS-Accredited Hyperbaric Facilities for Treatment of Specific Illnesses The FTC separately requires companies to support health-related advertising claims with solid proof and uses warning letters to enforce compliance against unsubstantiated claims.13Federal Trade Commission. Health Claims
If you’re building a hyperbaric practice, the safer path is limiting your marketing to the conditions in the CMS National Coverage Determination plus any additional conditions with strong clinical evidence. Claiming HBOT treats conditions the FDA hasn’t recognized draws attention from both the FDA and the FTC and can trigger state consumer protection actions. Facilities that get into serious trouble almost always did so by marketing benefits they couldn’t substantiate, not by missing a form on the licensing side.