Total HBOT Provider Count
The Undersea and Hyperbaric Medical Society reported “well over 1,000 hyperbaric programs” operating in the United States as of Q1 2025. That is the most reliable authoritative figure available. Programs range from academic medical centers running multiplace chambers to freestanding clinics with single monoplace units, and no single registry captures them all.
Facilities by Type
| Facility Type | Count | Trend |
|---|---|---|
| Hospital-based wound care/HBOT centers | 800-1,000 | Stable (2-3% growth) |
| Freestanding HBOT clinics | 350-500 | Fast growth (15-20%/yr) |
| Integrative/functional medicine (HBOT as add-on) | 150-200 | Growing (10-15%/yr) |
| Military/VA facilities | 40-50 | Stable |
| Emergency/dive medicine | 40-50 | Stable/slight decline |
Historical Growth: 1977 to 2025
A 1981 article in JAMA documented approximately 93 hyperbaric chambers in the US, up from just 27 in 1977, representing a nearly 4-fold increase in four years.6 From 27 chambers in 1977 to over 1,000 programs today represents roughly a 40-fold expansion over five decades.
“There are well over one thousand hyperbaric programs in the United States as of 2025, each typically operating multiple chambers. The number has grown from just 27 chambers in 1977 to over 1,000 programs today.”
UHMS 2025 Q1 Report; JAMA 1981
State-by-State Distribution
Top States by HBOT Facility Count
| Rank | State | Est. Facilities | Facilities per 1M Pop. |
|---|---|---|---|
| 1 | Florida | 140-170 | 6.3 |
| 2 | Texas | 130-160 | 4.3 |
| 3 | California | 120-150 | 3.1 |
| 4 | New York | 70-90 | 3.6 |
| 5 | Arizona | 50-65 | 6.8 |
| 6 | Pennsylvania | 50-60 | 3.8 |
| 7 | Ohio | 45-55 | 3.8 |
| 8 | Colorado | 35-45 | 5.9 |
Growth Trends
Freestanding Clinics: Fastest-Growing Segment
Freestanding HBOT clinics have seen dramatic growth driven by lower barriers to entry, growing demand for off-label HBOT for conditions like long COVID and TBI, and cash-pay business models. A single monoplace hard chamber can be purchased for $100,000-$200,000, making independent clinic ownership feasible.
Hospital Programs: Stable, Consolidating
Hospital-based HBOT programs are growing slowly but consolidating under large wound care management companies like Healogics and RestorixHealth, which operate chains of 200-400+ locations each.
Access Gaps
- Rural access: Approximately 30% of the US population lives more than 60 miles from the nearest HBOT provider. In Montana, Wyoming, and the Dakotas, patients may need to travel 200+ miles for emergency HBOT access
- Multiplace chambers: Only approximately 100-150 multiplace chambers exist in the US, limiting access for patients who need higher-pressure treatment or have claustrophobia concerns
Global Context
As of 2020, China had 1,924 institutions offering HBOT with 2,699 chambers and 11,266 practitioners, according to a nationwide survey published in Undersea & Hyperbaric Medicine.7 Israel has the highest per-capita HBOT utilization globally, driven by national insurance coverage for select off-label indications and the Sagol Center’s large-scale programs.
- UHMS 2025 Q1 Report. uhms.org/component/tags/tag/2025-1st-quarter.html
- Precedence Research. Hyperbaric Oxygen Therapy Market Size 2025-2034. precedenceresearch.com
- CMS. Medicare Provider Enrollment Data. cms.gov
- UHMS. Accredited Clinical Hyperbaric Facilities. uhms.org
- Divers Alert Network (DAN). Emergency Recompression Chamber Network. diversalertnetwork.org
- Gunby P. (1981). HBO: new chambers, some growing pains. JAMA. DOI: 10.1001/jama.1981.03320110005003
- Zhang Y, Yang J, Li JS. (2022). Clinical application of HBO2 therapy in China: A 2020 baseline survey. Undersea & Hyperbaric Medicine. DOI: 10.22462/03.04.2022.3
- Fife C, Eckert K. (2018). The Hyperbaric Oxygen Therapy Registry. Undersea & Hyperbaric Medicine. DOI: 10.22462/01.02.2018.1
- National Board of Diving & Hyperbaric Medical Technology (NBDHMT). Certified Facilities. nbdhmt.org
HBOT Clinic Growth by Decade
The US hyperbaric therapy industry has grown in distinct phases, each driven by different catalysts:
- 1970s-1980s: Military and diving medicine dominated. From 27 chambers in 1977 to 93 in 1981, growth was driven by Navy decompression research and the formation of the UHMS in 1967. Nearly all facilities were hospital or military based.
- 1990s-2000s: Medicare began covering HBOT for wound care in the late 1990s, triggering hospital wound care center expansion. Healogics (then Curative Health Services) and RestorixHealth built management chains of 200 to 400+ locations. By the mid-2000s, hospital-based programs numbered in the hundreds.
- 2010s: Freestanding clinics emerged as monoplace chamber costs dropped below $150,000. The off-label market for TBI, autism research, and sports recovery drove independent clinic openings at 15 to 20% annual growth rates.
- 2020s: Long COVID created a surge in patient demand starting in 2022. The Tel Aviv RCT demonstrating cognitive improvement in long COVID patients accelerated freestanding clinic openings. Integrative medicine practices adding HBOT as a service line grew 10 to 15% annually.
Hospital vs. Freestanding: A Shifting Market
The balance between hospital and freestanding HBOT has shifted notably over the past decade. In 2015, hospital wound care centers represented an estimated 75 to 80% of all HBOT providers. By 2025, that share has dropped to roughly 55 to 65%, with freestanding and integrative clinics capturing the growth.
Several factors drive this shift. Hospital wound care consolidation under management companies (Healogics manages 600+ wound care centers, though not all offer HBOT) has kept hospital counts stable but not growing. Meanwhile, the cash-pay off-label market faces no insurance authorization barriers, creating a more attractive business model for independent operators. A single monoplace hard shell chamber can be purchased for $100,000 to $200,000, with annual operating costs of $50,000 to $100,000, making independent clinic ownership feasible in markets with sufficient demand.
For patients, this market shift has practical implications. Hospital programs offer insurance coverage and treating physician oversight but limited scheduling flexibility and longer wait times. Freestanding clinics offer immediate availability and flexible scheduling but require cash payment, typically $200 to $400 per session. See our HBOT cost guide for full pricing details.
What Clinic Density Means for Patient Access
Despite 1,000+ programs nationwide, access remains uneven. The top 8 states by facility count (Florida, Texas, California, New York, Arizona, Pennsylvania, Ohio, Colorado) contain roughly 60% of all HBOT providers but only 50% of the US population.
Patients in rural areas face the sharpest access gaps. An estimated 30% of the US population lives more than 60 miles from the nearest HBOT facility. In states like Montana, Wyoming, and the Dakotas, the nearest provider may be 200+ miles away. For conditions requiring 30 to 40 daily treatments, this distance effectively rules out outpatient HBOT without relocation.
Emergency HBOT access is even more constrained. Only 40 to 50 facilities nationwide maintain 24/7 emergency recompression capability, concentrated in coastal areas with diving communities and at major trauma centers.
Medical Disclaimer
The content on BaricBoost.com is for informational purposes only and is not intended as a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition. Never disregard professional medical advice or delay in seeking it because of something you have read on this website.
Author
Seph Fontane Pennock is the founder of BaricBoost.com and Regenerated.com, a clinic directory for regenerative medicine serving 10,000+ providers across the United States. He previously built and sold PositivePsychology.com, which grew to 19 million users and became the largest evidence-based positive psychology resource on the web. Seph brings direct experience as an HBOT patient, having completed protocols at clinics across three continents while navigating mold illness, systemic inflammation, and autoimmune conditions. His treatment journey includes hyperbaric oxygen therapy, peptide protocols, NAD+ therapy, and consultations with specialists from Dubai to Cape Town to Mexico. This combination of entrepreneurial track record and lived patient experience shapes everything published on BaricBoost.com. Every article is grounded in peer-reviewed research, informed by real clinical encounters, and written for patients making high-stakes treatment decisions. Seph's focus is on bringing transparency, scientific rigor, and practical guidance to the hyperbaric oxygen therapy space.
