TL;DR — Key Takeaways

• A non-physician generally cannot directly own a California med spa that provides medical services. The Corporate Practice of Medicine doctrine restricts ownership of medical entities to licensed physicians.
• The most common workaround is the MSO model: a professional medical corporation (owned by a physician) provides the medical services, while a separate management services organization (which can be owned by anyone) provides non-clinical support.
• Nurse practitioners, physician assistants, and registered nurses cannot own a medical corporation in California. The professional corporation must be physician-owned. [VERIFY: confirm latest Medical Board of California guidance.]
• Investors can participate financially through the MSO. They cannot own the medical practice itself or control clinical decisions.
• SB 351 (effective January 1, 2026) added new restrictions for private equity and hedge fund involvement in physician practices, narrowing what MSO arrangements can do.

Why California Restricts Med Spa Ownership

California has one of the country’s strictest versions of the Corporate Practice of Medicine doctrine, often shortened to CPOM. The doctrine, rooted in the Medical Practice Act (Business and Professions Code §§ 2000 et seq.) and decades of Medical Board of California guidance, holds that only licensed physicians can practice medicine, and that medical practices must be owned and controlled by physicians. The goal is to keep clinical decisions in the hands of trained clinicians rather than corporate owners with profit motives that might conflict with patient care.

Med spas occupy a tricky space because they offer a mix of medical procedures (Botox, fillers, laser treatments, IV therapy, prescription weight loss drugs) and non-medical services (facials, massages, microdermabrasion). Anything that involves a prescription, an injection, or the use of energy-based devices for medical purposes is the practice of medicine in California. That means the entity providing those services must comply with CPOM.

Can a Nurse Practitioner Own a Med Spa in California?

Generally no, not as a medical corporation. California’s professional corporation law restricts ownership of a medical corporation to licensed physicians, with limited shareholder participation by other licensees.

Nurse practitioners and physician assistants can own businesses that operate within their own scope of practice. A nurse practitioner can own a nursing corporation. But a med spa offering services beyond NP scope (or treating patients under standardized procedures or physician oversight) generally cannot be NP-owned and serve as a medical practice.

AB 890 expanded the autonomy of certain experienced California nurse practitioners starting in 2023, but that statute addresses scope of practice and supervision, not corporate ownership of medical entities. The CPOM ownership rules still apply.

What Is the MSO Model and How Does It Let Non-Physicians Participate?

The management services organization model — usually called the MSO model or the friendly PC model — is the standard structure California uses to allow non-physician participation in medical businesses. It works through two separate entities.

The first is the professional medical corporation (the PC), owned by a licensed California physician. The PC employs the clinicians, holds the medical license, and provides all clinical services. The PC owns the patient relationship and the medical records.

The second is the management services organization (the MSO), which can be owned by anyone — investors, entrepreneurs, nurses, physician assistants, family members, private equity. The MSO provides non-clinical services to the PC: marketing, billing, IT, HR, equipment leasing, real estate, scheduling. The MSO is paid a management fee for these services.

Done correctly, the MSO model lets non-physicians invest capital and participate in the business side of a med spa without practicing medicine or violating CPOM. Done incorrectly, the structure becomes a pretext that the Medical Board, the Attorney General, or a court can pierce.

Can an Investor Own Part of a California Med Spa?

An investor can own all or part of an MSO. They cannot own the medical practice itself.

The MSO can hold significant value: trademarks, real estate, equipment, patient management software, accounts receivable, and the management contract with the PC. Investors who purchase MSO equity get exposure to that value and to the management fees the MSO collects.

What investors cannot do is direct clinical operations. They cannot decide which procedures the medical staff performs, set patient volume requirements, dictate referral patterns, or override clinical judgment. After SB 351, some of these limits became explicit statutory prohibitions when the investor is a private equity group or hedge fund.

What Happens if a Med Spa Is Structured Without a Physician Owner?

The risks are serious. A non-CPOM-compliant structure exposes the business to multiple enforcement paths.

The Medical Board of California can investigate and refer the matter to the Attorney General. The AG can seek injunctive relief and civil penalties. Physicians associated with the arrangement can face license discipline.

Insurance reimbursement gets disrupted. Payers can refuse to honor claims billed by a non-compliant entity, demand recoupment of past payments, and terminate provider contracts.

Management fees and profits paid to non-physicians can be challenged as fee-splitting under Business and Professions Code § 650, which carries criminal penalties as well as civil exposure.

Contracts are vulnerable. After SB 351, certain MSO contract provisions are statutorily void and unenforceable. A non-compliant structure can also create successor liability problems for an acquirer in a sale.

Can a Spouse or Partner of a Nurse Own a Share of the Business?

Family members can own MSO equity without restriction. The MSO is not a medical entity, so the ownership of the MSO is not regulated by CPOM.

What family members cannot do is own shares in the medical corporation itself. California law restricts shareholders in a medical corporation to licensed physicians and a limited group of other healthcare licensees, with caps on the percentage of stock the non-physician licensees can hold. A spouse who isn’t a healthcare licensee cannot hold any equity in the PC. [VERIFY: BPC § 13401.5 lists the specific licensees permitted as minority shareholders in medical corporations.]

If the spouse is a registered nurse, physician assistant, or psychologist, they may be able to hold a minority stake in the PC under the limited categories the statute permits. Even then, the percentage is capped, and the physician must hold the controlling interest.

How to Structure a Compliant California Med Spa

The compliant structure follows a sequence. Form the medical corporation with a California-licensed physician as owner. Register it as a professional corporation with the Secretary of State and obtain a fictitious name permit if operating under a different name. Get the Medical Board of California to issue or recognize the corporate registration. Form the MSO as a separate LLC or corporation. Draft a management services agreement between the PC and the MSO that pays the MSO a fair market value fee for genuine non-clinical services. Ensure the medical director arrangement (the physician’s role) is properly documented and complies with current Medical Board guidance.

Get this designed by counsel familiar with California healthcare regulatory practice. The DIY versions of MSO structures fail in audit and litigation more often than they hold up.

This article is for general information and is not legal advice. For guidance on your specific situation, contact Bay Legal, PC at 650-668-8000 to schedule a consultation.