How to Choose a Hyperbaric Oxygen Therapy Clinic: 7 Questions to Ask

You found three hyperbaric oxygen therapy clinics within driving distance. One charges $75 per session in a spa setting. Another charges $350 at a hospital-affiliated wound center. The third advertises "mild hyperbaric therapy" with no doctor required. Which one is actually safe and effective?

The difference between a well-run hyperbaric oxygen therapy clinic and a questionable one can mean real healing versus wasted money, or worse, a safety risk. The FDA issued a safety communication in August 2025 after reports of fires, injuries, and fatalities linked to improper hyperbaric device use.

Meanwhile, the Undersea and Hyperbaric Medical Society (UHMS) has only accredited about 267 facilities out of the more than 2,400 clinics operating nationwide.

Those numbers should tell you something: not all clinics meet the same standards. This guide gives you seven specific questions to ask before booking your first session, so you can find a clinic that puts your safety first.

Why choosing the right hyperbaric oxygen therapy clinic matters

Hyperbaric oxygen therapy delivers pure oxygen at increased pressure inside a sealed chamber. When done correctly under medical supervision, it can accelerate wound healing, reduce infection risk, and support recovery from conditions like radiation injury and carbon monoxide poisoning.

But the quality of care varies enormously from one facility to the next. Some clinics operate under strict medical protocols with board-certified physicians on-site. Others function more like wellness spas, offering low-pressure sessions without meaningful medical oversight.

The stakes are real. Hyperbaric chambers involve pressurized pure oxygen, which creates a heightened fire risk. The FDA has documented cases where improvised setups and noncompliant equipment led to serious harm. Choosing the right clinic is not just about getting better results; it is about staying safe during treatment.

Consider Linda, a 58-year-old with a non-healing diabetic foot ulcer. Her podiatrist recommended hyperbaric oxygen therapy, but she found prices ranging from $100 to $400 in her area. She almost booked the cheapest option until she learned it used a soft-shell chamber at only 1.3 ATA, well below the 2.0 ATA minimum her condition required. Instead, she chose a UHMS-accredited wound care center with hard-shell chambers, and her wound closed within 30 sessions.

Question 1: Is the clinic UHMS-accredited?

This is the single most important question you can ask. UHMS accreditation is the gold standard in hyperbaric medicine, and it is the only hyperbaric-specific accreditation recognized by The Joint Commission.

To earn UHMS accreditation, a facility must pass a rigorous evaluation of its equipment, staff qualifications, safety protocols, and patient care standards. The process examines fire prevention, patient monitoring, emergency preparedness, maintenance schedules, and standardized operating procedures.

Here is what makes accreditation meaningful:

• The FDA specifically recommends that patients seek treatment at UHMS-accredited facilities
• The Joint Commission recognizes UHMS as a complementary accrediting organization
• Only about 267 facilities have earned this designation out of thousands operating nationwide

How to check accreditation status

Visit the UHMS accredited facilities directory and search by state. If a clinic claims to be accredited, verify it on the UHMS website before booking. You can also browse hyperbaric oxygen therapy clinics on FindHBOT and filter by location.

Not every good clinic has UHMS accreditation; the process is voluntary and can be expensive for smaller facilities. But accreditation eliminates much of the guesswork about safety and quality.

Question 2: What type of chamber does the clinic use?

The type of hyperbaric chamber a clinic uses directly affects the treatments it can safely deliver. There are four main types of hyperbaric chambers, and the differences matter.

Chamber Type	Max Pressure	Oxygen Delivery	Best For
Hard-shell monoplace	3.0 ATA	100% O2	Single-patient medical treatment
Hard-shell multiplace	6.0 ATA	100% O2 via hood/mask	Multiple patients, complex cases
Soft-shell (mild)	1.3 ATA	~24% O2 (ambient)	Altitude sickness only (FDA-cleared)
Veterinary	Varies	Varies	Animal treatment

The critical distinction: Hard-shell chambers pressurize to 2.0-3.0 ATA with 100% medical-grade oxygen. At 2.0 ATA, your blood oxygen levels reach roughly 1,824 mmHg. Soft-shell chambers max out at 1.3 ATA with ambient air, producing only about 230 mmHg of arterial oxygen.

Soft-shell chambers are only FDA-cleared for treating acute mountain sickness. They are not approved for wound healing, TBI, Long COVID, or any other medical condition. Hard-shell chambers must meet ASME PVHO-1 (Pressure Vessels for Human Occupancy) and NFPA 99 (Health Care Facilities Code) safety standards.

Ask specifically: "What is the maximum pressure your chambers can achieve, and do they meet ASME PVHO-1 and NFPA 99 standards?"

Question 3: Is a physician present during treatments?

Hyperbaric oxygen therapy is a medical procedure. It requires a physician's prescription, a thorough medical evaluation, and ongoing medical supervision. Yet some facilities, particularly wellness spas and biohacking centers, operate without a doctor on-site.

The UHMS published Ten Guidelines for Patients and Referring Physicians in April 2025, specifically addressing concerns about facilities that provide hyperbaric therapy without physician oversight, formal medical training, or adherence to national safety standards.

What proper physician involvement looks like:

• A prescribing physician reviews your medical history, medications, and imaging
• A physical examination and chest X-ray are completed before your first session
• A physician is available (ideally on-site) during every treatment session
• Treatment protocols are adjusted based on your response and medical needs

Consider Mark, a 42-year-old former college athlete who wanted hyperbaric oxygen therapy for an old knee injury. He visited a wellness center offering "oxygen sessions" at $75 each. No doctor evaluated him. No one asked about his medical history or medications. He later learned he had a small, undiagnosed pneumothorax that could have become life-threatening under pressure. A medical-grade clinic would have caught this with a pre-treatment chest X-ray.

Ask specifically: "Is a physician on-site during my treatments? Who prescribed the treatment protocol, and what medical evaluation will I receive before starting?"

Question 4: What safety protocols does the clinic follow?

A safe hyperbaric facility should be able to clearly explain its safety procedures. If the staff cannot answer these questions or seems unsure, that is a red flag.

Pre-treatment safety

Before your first session, a reputable clinic will:

• Conduct a complete medical history review
• Perform a physical examination
• Order a chest X-ray to rule out pneumothorax and lung disease
• Review all current medications for contraindications
• Screen for conditions like untreated pneumothorax, certain seizure disorders, and claustrophobia

During-treatment safety

The UHMS recommends that clinics perform a procedural "time-out" before each treatment to confirm patient identity, treatment plan, and safety readiness. Additional safety measures include:

• Continuous patient monitoring throughout the session
• A minimum of one Certified Hyperbaric Registered Nurse (CHRN) or Certified Hyperbaric Technologist (CHT) present during chamber operations
• Emergency response protocols with regular simulated drills
• Fire prevention procedures, including restrictions on personal items brought into the chamber

Equipment maintenance

Chambers should undergo regular inspection and maintenance by certified specialists. Ask when the chamber was last inspected and whether maintenance records are available.

Ask specifically: "What pre-treatment screening do you perform? What happens if there is an emergency during my session?"

Question 5: Does the clinic treat your specific condition?

Not all hyperbaric oxygen therapy clinics treat every condition. Some specialize in wound care. Others focus on sports recovery or neurological conditions. Matching your needs to a clinic's expertise matters.

FDA-approved conditions

The FDA has cleared hyperbaric oxygen therapy for 14 specific conditions, including:

• Diabetic wound healing (non-healing ulcers)
• Radiation injury (soft tissue and bone necrosis)
• Carbon monoxide poisoning
• Decompression sickness
• Sudden sensorineural hearing loss
• Crush injuries and compromised skin grafts

For these conditions, insurance is more likely to cover treatment, and the clinical evidence is strongest.

Off-label uses with growing evidence

Conditions like Long COVID, TBI and concussion, and sports recovery are being actively studied but are not yet FDA-approved indications. Treatment for these conditions is typically out of pocket. Look for clinics that cite specific research supporting their protocols rather than making broad wellness claims.

Ask specifically: "Do you have experience treating my condition? What protocol do you follow, and what evidence supports it?"

Question 6: What are the staff qualifications?

The people operating the hyperbaric chamber and monitoring your treatment should have specific training and certifications. This is not a job for general wellness staff.

Key certifications to ask about:

• CHRN (Certified Hyperbaric Registered Nurse): A registered nurse with specialized hyperbaric training
• CHT (Certified Hyperbaric Technologist): A technician trained specifically in hyperbaric chamber operations
• Board-certified physician in undersea and hyperbaric medicine or a related specialty (wound care, emergency medicine, pulmonology)

The UHMS accreditation standards require that at least one CHRN or CHT be present during all chamber operations. This ensures someone with specific hyperbaric training is monitoring your safety at all times.

Beyond certifications, experience matters. A clinic that has treated hundreds of patients with your condition will likely deliver better outcomes than one that just added hyperbaric therapy as a side offering.

Ask specifically: "What certifications do your hyperbaric staff hold? How many patients with my condition have you treated?"

Question 7: What does treatment cost, and does the clinic accept insurance?

Hyperbaric oxygen therapy typically costs between $200 and $400 per session at independent clinics, with a full treatment course of 20 to 40 sessions. That adds up quickly, so understanding the cost structure before you commit is essential.

For a detailed breakdown by clinic type, insurance, and condition, read our complete HBOT cost guide.

Insurance coverage

Insurance, including Medicare, generally covers hyperbaric oxygen therapy for FDA-approved conditions only. Coverage details vary by plan, but Medicare typically reduces the per-session cost to $50-$100 in copays. For a full breakdown of what is covered, see our guide on whether insurance covers hyperbaric oxygen therapy.

Questions about cost

• What is the per-session rate?
• Do you accept my insurance plan?
• Is a free consultation or initial evaluation offered?
• Are package rates available for a full treatment course?
• What additional costs should I expect (medical evaluation, imaging, follow-up)?

Ask specifically: "What is the total estimated cost for my treatment plan, including evaluation fees? Do you work with my insurance provider?"

Red flags: when to walk away from a clinic

Not every facility advertising hyperbaric oxygen therapy meets basic safety standards. Watch for these warning signs:

• No physician involvement. If no doctor evaluates you, prescribes your protocol, or is available during treatment, find a different clinic.
• "Cure" claims. Any clinic claiming hyperbaric oxygen therapy cures cancer, Alzheimer's, autism, or Lyme disease is making claims the FDA has specifically warned against.
• Soft-shell chambers for medical conditions. If a facility only offers low-pressure soft-shell chambers but claims to treat wound healing, neurological conditions, or other medical diagnoses, their equipment does not match their claims.
• Resistance to sharing credentials. A reputable clinic will gladly share staff certifications, accreditation status, and chamber specifications.
• No pre-treatment evaluation. Skipping the medical history, physical exam, and chest X-ray means the clinic is cutting corners that exist to protect you.
• Unusually low prices. If the price seems too good to be true, ask why. It may indicate lower-grade equipment, unlicensed staff, or missing safety protocols.

Your clinic comparison checklist

Use this quick reference when evaluating clinics:

Question	Ideal Answer	Red Flag
UHMS accredited?	Yes, verified on uhms.org	No accreditation, cannot verify
Chamber type?	Hard-shell, ASME/NFPA certified	Soft-shell only for medical conditions
Physician on-site?	Yes, prescribing and supervising	No doctor involved
Safety protocols?	Pre-screening, time-outs, drills	No clear safety procedures
Treats your condition?	Experienced, cites evidence	Vague wellness claims
Staff certified?	CHRN/CHT on-site during treatment	No hyperbaric certifications
Cost transparent?	Clear pricing, insurance details	Hidden fees, no estimates

Frequently asked questions

Is UHMS accreditation required by law?

No. UHMS accreditation is voluntary. However, it is the only hyperbaric-specific accreditation recognized by The Joint Commission, and the FDA recommends patients choose UHMS-accredited facilities. Many insurance companies also require or prefer UHMS accreditation for reimbursement.

Can I use a soft-shell chamber for medical treatment?

Soft-shell (mild) hyperbaric chambers are only FDA-cleared for acute mountain sickness. They operate at 1.3 ATA with ambient air, which delivers significantly less oxygen than the 2.0+ ATA with 100% O2 used in medical-grade hard-shell chambers. For any medical condition, a hard-shell chamber is the appropriate choice.

How many hyperbaric oxygen therapy clinics are in the US?

There are more than 2,400 clinics offering some form of hyperbaric oxygen therapy across the United States. You can browse all clinics on FindHBOT, filtered by state, city, and condition treated.

Should I get a physician referral before visiting a clinic?

Yes. A referral from your primary care doctor or specialist helps ensure that hyperbaric oxygen therapy is appropriate for your condition. It also streamlines the insurance approval process for FDA-approved indications.

How do I verify a clinic's safety record?

Ask the clinic directly about any incidents and how they were handled. Check for UHMS accreditation status, state health department records, and online reviews from other patients. A transparent clinic will answer safety questions without hesitation.

Finding a clinic you can trust

Choosing a hyperbaric oxygen therapy clinic comes down to seven questions: accreditation, chamber type, physician presence, safety protocols, condition expertise, staff qualifications, and cost transparency. A clinic that answers all seven confidently is one worth trusting with your care.

The UHMS, FDA, and Joint Commission all point in the same direction: look for medical-grade facilities with qualified staff, proper equipment, and transparent practices. Do not settle for a clinic that cannot clearly explain how it keeps you safe.

Ready to compare your options? Browse hyperbaric oxygen therapy clinics near you on FindHBOT, with details on chamber types, specializations, and contact information for more than 2,400 verified clinics across all 50 states.

Sources

1. UHMS Hyperbaric Facility Accreditation Program. Undersea & Hyperbaric Medical Society. uhms.org/accreditation
2. Ten Guidelines for Patients and Referring Physicians in Selecting Safe Hyperbaric Oxygen Treatments. UHMS, April 2025. uhms.org (PDF)
3. Follow Instructions for Safe Use of Hyperbaric Oxygen Therapy Devices. FDA Letter to Health Care Providers, August 2025. fda.gov
4. FDA Recommends UHMS-Accredited Hyperbaric Facilities for Treatment. UHMS. uhms.org
5. Hyperbaric Patient Selection. StatPearls, NCBI Bookshelf. ncbi.nlm.nih.gov

This article is for informational purposes only and does not constitute medical advice. Always consult a qualified healthcare provider before starting any treatment, including hyperbaric oxygen therapy.