A short conversation with the clinic, asking the right questions, can prevent most of the safety and value problems patients run into with HBOT. See the multiple sclerosis evidence atlas for the full investigational evidence breakdown.
This checklist walks through what to ask before any first session. Use it whether you are pursuing FDA-approved indications at a wound care center or mild HBOT at a wellness clinic.
The right clinic answers these questions without hesitation. Defensive responses are a signal.
Question 1: Is the clinic UHMS-accredited?
UHMS accreditation (2024) is the strongest single quality signal in US HBOT. 180 of the 1,588 US HBOT centers in our directory carry it. 57 are at the "with distinction" tier.
Cross-check the clinic's claim in the UHMS facility directory (2024). Accreditation status changes; the directory is the source of truth.
If the clinic claims accreditation but does not appear in the directory, ask for documentation. If it is not UHMS-accredited at all, that is workable for wellness clinics but signals lower quality infrastructure for medical indications.
Question 2: What is the chamber's FDA 510(k) number?
Every legal US HBOT chamber has a FDA 510(k) clearance number (2024) under product code CBF.
A legitimate clinic will provide the number on request. Cross-check it yourself in the FDA database. Common chambers you might see:
- Sechrist Industries 3300 — K052713
- Perry Baromedical Sigma 3400 — K990927
- Summit to Sea Dive — K072757
- OxyHealth Vitaeris 320 and similar soft chambers
If the clinic cannot or will not provide the number, the chamber may be a gray-market import or modified unit. That voids the clearance and creates real legal risk if injury occurs.
Question 3: What are the FDA-approved indications you treat?
The clinic should be able to name the 14 FDA-approved HBOT indications listed by Medicare (2024) and the ones they specifically treat.
For wound care centers, expect mention of diabetic foot ulcers, radiation tissue damage, refractory osteomyelitis, decompression sickness, and other established indications. See the osteomyelitis evidence atlas for the full study-by-study evidence breakdown.
For wellness clinics, the cleared indication is acute mountain sickness only. Everything else is off-label. A clinic that mixes off-label use with cure-language marketing is in FDA promotional-violation territory (2021).
Question 4: Who is the medical director?
For FDA-approved indications and any insurance billing, a medical director is required. The director should be a physician with hyperbaric training — typically board-certified in undersea and hyperbaric medicine, or carrying American Board of Medical Specialties (2024) sub-certification.
Ask for the director's name and credentials. Verify the board status independently if needed.
For wellness clinics offering only 1.3 ATA, requirements vary by state. Some states require physician supervision; others do not. A wellness clinic without any medical director is workable in some states but carries lower oversight.
Question 5: What is the chamber pressure and protocol?
The clinic should be able to state:
- The pressure they run (1.3 ATA for mild HBOT, 2.0 to 3.0 ATA for hospital-grade)
- The session duration (60 to 120 minutes is typical)
- The total course length (usually 20 to 40 sessions for indications, fewer for acute)
- The oxygen delivery (100% via mask for medical, supplemental via concentrator for mild)
A clinic that claims 2.0 ATA delivery from a soft-shell chamber is misrepresenting the equipment. Soft chambers cannot reach 2.0 ATA. See our mild HBOT vs medical HBOT guide for the pressure category differences.
Question 6: What is the per-session cash price?
Pricing should be clear and in writing before any commitment. Expected ranges:
- Mild HBOT (1.3 ATA) at wellness clinics: $150 to $300 per session
- Hospital-grade HBOT (2.0 to 3.0 ATA) at UHMS-accredited facilities: $400 to $700 cash or insurance
- Off-label hard-chamber: $300 to $600 per session
A clinic charging $500 per session for soft-shell mild HBOT is overpriced for what the equipment delivers. See why clinics charge $200 for 1.3 ATA vs $450 for 2.4 ATA for the cost breakdown.
Question 7: Does insurance cover sessions?
Medicare and most private insurers cover HBOT for the 14 FDA-approved indications. Coverage requires:
- A qualifying indication documented by a physician
- Treatment at a UHMS-accredited or equivalent facility
- 2.0 to 3.0 ATA pressure in a hard-shell chamber
- Proper medical billing codes
Wellness clinic 1.3 ATA sessions are not covered. Off-label hard-chamber HBOT is sometimes covered for select conditions but requires specific documentation.
The clinic should be able to verify your benefits before treatment starts. Get the verification in writing.
Question 8: What is the operator's certification?
HBOT operators should hold Certified Hyperbaric Technologist (CHT) certification (2024) for hospital-grade chambers. CHT covers chamber operation, fire safety, oxygen handling, and emergency response.
Wellness clinics with soft-shell chambers have lower requirements. The operator should at minimum have completed manufacturer safety training.
Operators without any documented training are a red flag. Ask for documentation if it is not offered.
Question 9: What is the safety briefing?
Every legitimate clinic provides a pre-session safety briefing. The briefing should cover:
- Oxygen toxicity symptoms — twitching, anxiety, visual changes
- Ear barotrauma — pressure equalization techniques
- Fire safety — no electronics, synthetics, hand warmers, or vapes
- Emergency response — what happens if symptoms appear
- Consent — review of the indication and known complications
A clinic that skips the safety briefing or treats safety questions dismissively has a culture problem. See our HBOT consent forms red flags guide for what a legitimate consent form should include.
Question 10: What complications have you seen?
A direct question and a direct answer is the test. Every active HBOT program sees complications.
The Camporesi 2014 review (2014) tracked ear barotrauma at 2 to 10% across HBOT settings. Oxygen toxicity events occur in roughly 1 to 2% of sessions.
A clinic that has never seen any complication is either too new to know, or hiding the truth. Either way, ask follow-up questions.
A clinic that describes its complication response procedures clearly and confidently is the one to choose. The honest answer is "we see X event Y times per year and our response is Z."
What to do with the answers
A clinic that answers all 10 questions clearly is a strong candidate. A clinic that hedges on more than one or two is one to pass on.
The questions are not gotcha tests. They are the standard checks any reasonable HBOT facility should welcome. Defensive responses are themselves the signal.
See our HBOT clinic red flags guide for the warning signs that should lead you to walk.
Related reading
- HBOT clinic red flags: signs of unsafe practice
- HBOT consent forms: red flags to watch for
- How to verify a clinic's chamber is medical grade
- UHMS-accredited HBOT facilities: what certification means
Frequently asked questions
How do I verify UHMS accreditation status?
Check the UHMS facility directory directly. The directory lists all currently accredited facilities by state and includes the accreditation tier (standard or with distinction). Accreditation status can change; rely on the directory rather than a clinic's marketing materials.
Is a clinic without a medical director automatically unsafe?
Not automatically — state laws vary. For FDA-approved indications and any insurance billing, a medical director is required. For wellness clinic 1.3 ATA sessions in states with permissive rules, the absence of a director is legal but represents lower oversight. The risk profile depends on the operator's training and the safety culture.
What if the clinic says they can treat conditions the FDA does not approve?
Off-label medical use is legal in the US when prescribed by a physician based on clinical judgment. The problem is when off-label HBOT is marketed with disease-modification claims or sold as packages without medical evaluation. The line is between honest off-label use and promotional violation.
Should I get a second opinion before starting HBOT?
For elective off-label uses, yes. A second opinion from a physician outside the clinic helps confirm the indication is reasonable and the protocol is appropriate. For acute indications like CO poisoning or decompression sickness, no — the time-to-treatment matters more than a second opinion.
What is the most important question of the ten?
The medical director question. Without a hyperbaric-trained physician overseeing the program, all the other safety, pricing, and protocol questions become harder to answer confidently. A clinic with a strong medical director typically has strong answers to the other nine questions as well.
Medical disclaimer
This article is for informational purposes only and does not constitute medical advice. HBOT carries real risks including oxygen toxicity, ear barotrauma, and fire. Always verify clinic credentials, chamber clearance, and medical supervision before treatment. Consult your doctor before pursuing HBOT for any condition.
-- The HBOT Finder Team