Key Takeaways
- Hyperbaric chambers are FDA-cleared Class II medical devices (Product Code CBF, 510(k) pathway). Hyperbaric therapy requires a physician prescription for procurement and use — whether the facility markets its services as “medical” or “wellness.”
- California’s Corporate Practice of Medicine doctrine applies to any facility that treats patients, and hyperbaric therapy is treatment. Non-licensee ownership of the clinical entity is not lawful.
- The two dominant hyperbaric business models — medical HBOT (FDA-cleared indications, physician-supervised, sometimes payor-billed) and “wellness HBOT” (off-label indications, cash-pay, often marketed without physician involvement) — face different clinical and marketing risks but the same CPOM analysis.
- Non-licensee buyers acquire hyperbaric businesses through the friendly-PC + MSO structure. The clinical entity is a physician-owned professional corporation; the buyer’s MSO handles the non-clinical operations.
- The seller of a “wellness” hyperbaric business is often operating without a compliant clinical structure at all. Diligence needs to catch this before the LOI is signed, because taking over a non-compliant operation extends the seller’s exposure to the buyer.
If you are not a licensed physician and you are looking to buy a hyperbaric chamber business in California, you are looking at a category with unusually confusing surface signals. The seller may market the facility as “wellness,” “recovery,” or “anti-aging.” The revenue may run cash-pay through memberships or packages. The chamber may look, to a non-licensee buyer, more like a spa amenity than a medical device. None of that changes what the business actually is under California law. Hyperbaric oxygen therapy chambers are FDA-cleared Class II medical devices, and hyperbaric therapy requires a physician prescription for procurement and use. The business treats patients. That means the Corporate Practice of Medicine doctrine applies, whether the marketing says “medical” or “wellness.”
This post is the diligence and structural guide for a non-licensee buyer evaluating a California hyperbaric target. It is a companion to the pillar post on non-licensee acquisitions of California treatment businesses generally and pairs with the remediation post for owners who already bought one non-compliantly.
The Threshold Question: Is Hyperbaric Therapy the Practice of Medicine?
Yes. It is not close.
Hyperbaric oxygen therapy delivered in a Class II medical device chamber, at pressures above atmospheric, breathing 100% oxygen (or supplemental oxygen), for the purpose of treating a condition or improving a physiological state, is the practice of medicine. The FDA classifies HBOT chambers as Class II medical devices and clears them through the 510(k) pathway (Product Code CBF). Medical-grade oxygen is a prescription drug. The Undersea and Hyperbaric Medical Society (UHMS) — the field’s dominant professional body, recommends that hyperbaric oxygen therapy be prescribed by a physician and administered under physician supervision or under supervision by an appropriately trained non-physician provider where local regulations permit.
The FDA has been publicly clear on the point since at least a 2013 consumer safety notice: HBOT is not proven for many of the off-label indications it is marketed for (cancer, Lyme disease, autism, Alzheimer’s, traumatic brain injury, post-COVID recovery, chronic fatigue), and consumers should discuss HBOT with their healthcare provider before using it. In 2024 the FDA issued a Letter to Healthcare Providers on HBOT device safe use following reports of chamber fires resulting in serious injuries and deaths.
None of this makes off-label HBOT unlawful — physicians can prescribe off-label. What it means for a non-licensee buyer is that the target business is medical, regardless of how the seller markets it, and the target’s compliance structure has to match.
Common seller framings that do not change the analysis:
- “This is wellness, not medicine.” The FDA classification is medical. The oxygen is a prescription drug. Compliance turns on what the business actually does, not on marketing labels.
- “It’s a soft chamber at 1.3 ATA, so it’s not medical.” Soft-shell chambers cleared for acute mountain sickness are a specific category; marketing and operating them for other indications is off-label, and off-label use does not remove the practice from the CPOM analysis. UHMS and AMA have opposed unsupervised use of low-pressure fabric chambers for indications beyond acute mountain sickness.
- “It’s all cash-pay so CPOM doesn’t apply.” CPOM is a licensing doctrine, not a payor doctrine. Payor mix does not affect the analysis.
- “The chamber runs like a tanning bed — we don’t need a physician.” Tanning beds are not Class II medical devices; hyperbaric chambers are. The comparison does not work.
The Two Hyperbaric Business Models a Buyer Sees
Model 1: Medical HBOT. Physician-supervised, treats primarily FDA-cleared indications (diabetic foot ulcers, radiation injury, chronic osteomyelitis, decompression sickness, carbon monoxide poisoning, and other indications on the FDA-cleared list), and typically bills payors under CPT code 99183. Often affiliated with a wound-care program, an academic medical center, or a hospital outpatient department. These businesses are usually already structured as physician-owned or hospital-affiliated. A non-licensee buyer sees these targets less often, and when they do, the diligence usually focuses on payor participation and CHOW mechanics rather than structural CPOM issues.
Model 2: Wellness HBOT. Positioned as “recovery,” “anti-aging,” “cognitive optimization,” or “cellular repair.” Treats off-label — post-concussion, chronic pain, athletic recovery, cognitive enhancement, longevity. Almost always cash-pay, often on membership or package pricing. Marketing typically does not emphasize the medical nature of the therapy. Structural compliance is often the material issue. These businesses are the ones a non-licensee buyer most often encounters through business brokers, wellness-industry marketplaces, and cross-industry search.
The buyer’s diligence approach differs between the two models. For Model 1, the primary diligence questions are around payor enrollment, physician credentialing, wound-care program integration, and hospital-affiliation contracts. For Model 2, the primary diligence questions are around CPOM structure, medical director arrangement, good-faith exam workflow, marketing representations, and historical exposure for having operated non-compliantly. Model 2 is where most non-licensee buyer opportunities exist and where most defects show up.
Diligence for a Non-Licensee Buyer: Hyperbaric-Specific
The general treatment-business diligence framework — CPOM structure, medical director role, good-faith exam workflow, standardized procedures, fee-splitting analysis, direct patient billing, marketing representations, historical regulatory issues, franchise-system MSA review, all apply. Six hyperbaric-specific issues warrant additional attention.
- Chamber classification and 510(k) status. The target’s chambers should be FDA-cleared Class II devices with 510(k) documentation on file. Confirm the manufacturer, model, and 510(k) number. Confirm the chamber has been serviced and inspected on the manufacturer’s recommended schedule. Non-cleared chambers, chambers of unknown provenance, and chambers modified from their cleared configuration are red flags — clinical, insurance, and (for medical HBOT targets) payor.
- Oxygen source and prescription documentation. Medical-grade oxygen is a prescription drug. Confirm the target’s oxygen supply chain, prescription documentation (per patient, per session, per treatment plan), and any DEA or state-level compliance around the oxygen source and delivery. A hyperbaric facility without documented prescription protocols is a defect.
- Physician involvement in prescribing and supervision. Every patient session should be preceded by a physician (or, within scope, an NP or PA) prescription for HBOT. Confirm who prescribes, on what basis, and with what documentation. Confirm who supervises during sessions and how — physically present, immediately available, remotely monitoring, or unavailable. Physical or immediate-availability supervision is what UHMS and the field expect. “The physician signed a blanket protocol six months ago” is not prescription; it is a documentation defect.
- Off-label marketing and consumer-representation exposure. Marketing that promises specific outcomes for off-label conditions (concussion recovery, TBI resolution, cognitive enhancement, cancer support, long COVID resolution, autism improvement) is high-exposure. It runs into (a) the FDA’s stated positions on unproven claims, (b) California false-advertising exposure under B&P § 17500 and the Unfair Competition Law (B&P § 17200), and (c) consumer-protection claims. This is a distinct exposure category from CPOM but frequently overlaps in the same targets.
- Sports and athletic-recovery relationships. Many wellness HBOT facilities partner with sports teams, athletes, or influencers. Confirm the terms of those relationships — endorsement, revenue-sharing, referral compensation — and confirm they do not trip B&P § 650’s fee-splitting prohibitions. Testimonial and endorsement content also needs to comply with the FTC’s endorsement guides and California’s disclosure requirements.
- Fire and safety compliance. The FDA’s 2024 letter to healthcare providers on HBOT device safe use reflects a real, documented risk category. Confirm the target has a safety program, incident logs, staff training records, and appropriate insurance coverage for chamber operations. A hyperbaric facility without a documented safety program has an underappreciated exposure the buyer will inherit.
Structuring the Compliant Acquisition
The general non-licensee acquisition sequence — physician-partner identification pre-LOI, asset purchase structure, bifurcated clinical/non-clinical asset transfer, PC formation, MSA drafting, payor and licensure transitions, post-closing operational discipline, applies to hyperbaric acquisitions with a few category-specific notes.
Physician-partner considerations. A physician-partner for a hyperbaric business should ideally have hyperbaric-relevant training or experience. UHMS training or Board certification in Undersea and Hyperbaric Medicine is uncommon outside of academic and hospital settings; more realistic is a physician with wound-care experience, emergency medicine background, or family/internal medicine training willing to develop hyperbaric-specific protocols. The buyer should not assume any California-licensed physician is qualified to prescribe and supervise HBOT — the physician’s background and training matters both clinically and for professional liability coverage.
MSA drafting. The MSA between the buyer’s MSO and the physician-partner’s PC follows the general pattern. Hyperbaric-specific provisions typically address chamber maintenance and safety program allocation between MSO (facility, equipment) and PC (clinical protocols, safety supervision), oxygen supply-chain administration, and marketing controls (given the off-label exposure).
Marketing rebuild post-closing. Buyers acquiring wellness-positioned hyperbaric facilities should assume a marketing rebuild is required post-closing. Off-label outcome claims, testimonials that overstate typical results, and representations that imply broader FDA approval than exists need to be replaced with compliant, defensible marketing. This is often more work than buyers anticipate and should be scoped in the closing transition plan.
Payor considerations. Most wellness HBOT facilities have limited payor enrollment; medical HBOT facilities may have Medicare, wound-care-program, and specific commercial payor relationships. For a target with meaningful payor enrollment, the Medicare CHOW analysis under 42 C.F.R. § 489.18 and any commercial payor consents or novations are part of the closing schedule. For predominantly cash-pay targets, these mechanics simplify substantially.
When to Bring Counsel Into a Hyperbaric Acquisition
Before the LOI is signed. Hyperbaric acquisitions can look deceptively simple to a non-licensee buyer approaching them for the first time — the equipment is discrete, the operational model is relatively contained, and the seller’s cash-pay revenue is often easier to diligence than an insurance-based practice. The complexity is on the compliance side, and the compliance side is where the buyer’s exposure lives. Pre-LOI structuring counsel is where the deal is either built for CPOM compliance or set up to inherit the seller’s defects.
Bay Legal, PC represents non-licensee buyers of California hyperbaric businesses through the full acquisition cycle. For guidance on your specific situation, call (650) 668-8000 or schedule a consultation at baylegal.com/contact.
Frequently Asked Questions
Can a non-doctor buy a hyperbaric chamber business in California?
Yes, but not through direct purchase of the seller’s entity if that entity holds a physician’s license or is a professional corporation. And not by continuing to operate through the seller’s LLC if the LLC has been treating patients. The compliant path is an asset purchase in which a licensed physician acquires the clinical assets (patient records, clinical goodwill, protocols) into a newly formed professional corporation, and the buyer’s management entity acquires the non-clinical assets (chamber, facility, systems, trade name) and provides services to the PC under a Management Services Agreement.
Is a “wellness” hyperbaric chamber business subject to the same rules as a “medical” one?
Generally yes for CPOM analysis. Hyperbaric chambers are FDA-cleared Class II medical devices and hyperbaric therapy requires a physician prescription. The California Corporate Practice of Medicine doctrine applies regardless of marketing framing, payor mix, or the specific indications treated. Wellness positioning does not exempt the practice from CPOM. It may, however, add separate marketing and false-advertising exposure.
Do I need physician supervision if patients are just doing “recovery” sessions?
Physician supervision (or immediate availability) is the professional standard for HBOT, reflected in UHMS guidance and California Medical Board expectations for practices offering hyperbaric therapy. Skipping supervision because the sessions are marketed as “recovery” does not change the underlying nature of the therapy or the standard of care that applies.
Can I keep operating on the seller’s marketing and just fix the entity structure?
Rarely a good idea. Wellness hyperbaric facilities’ marketing often includes off-label outcome claims, testimonials, and representations that create false-advertising and consumer-protection exposure separate from the CPOM issue. A buyer who fixes the entity structure but continues to market on the seller’s copy inherits the marketing exposure. A marketing rebuild is typically part of the closing transition plan.
What is different about diligence on a hyperbaric target compared to a med spa or IV clinic?
Six category-specific issues warrant additional attention: chamber classification and 510(k) status; oxygen source and prescription documentation; physician involvement in prescribing and supervision; off-label marketing and consumer-representation exposure; sports and endorsement relationships; and fire and safety compliance. The general CPOM diligence framework still applies; these are additions to it, not substitutes.
Talk to a California Hyperbaric Acquisition Attorney
Bay Legal, PC represents non-licensee buyers of California hyperbaric chamber businesses. If you are evaluating a hyperbaric target, negotiating an LOI, or closing on an acquisition, we can help you structure the deal for CPOM compliance and identify the hyperbaric-specific issues before they become closing problems. For guidance on your specific situation, call (650) 668-8000 or schedule a consultation at baylegal.com/contact.
