A nurse practitioner cannot own a medical spa outright in California the way someone might open a hair salon, but the law gives NPs real ownership and financial control through a few specific structures. You can hold up to 49 percent of a professional medical corporation, you can own 100 percent of a management company that runs the business side of the spa, and starting in 2026 a new category of independently practicing NP may be able to own a medical spa directly. Which route fits depends on your certifications, your appetite for regulatory risk, and whether you’re willing to work alongside a physician owner.
Why You Can’t Simply Open One Yourself
California’s Corporate Practice of Medicine doctrine blocks the direct path. Business and Professions Code Section 2400 states that “corporations and other artificial legal entities shall have no professional rights, privileges, or powers.”1California Legislative Information. California Business and Professions Code 2400 Medical decisions have to sit with licensed professionals, not with investors or corporate managers.
The Medical Board of California applies this directly to aesthetics: “Medical spas are marketing vehicles for medical procedures. If they are offering medical procedures, they must be owned by physicians.”2Medical Board of California. Medical Spas – What You Need to Know Neurotoxin injections, laser treatments, and the other mainstays of medical spa work are legally medical procedures, so the spa falls inside the doctrine. Forming an LLC and opening the doors is not an option for an NP acting alone.
What the law does allow is a set of ownership structures that put NPs inside the corporation or the business that supports it.
Owning Up to 49 Percent of a Medical Corporation
California Corporations Code Section 13401.5 lets certain licensed healthcare professionals hold minority shares in a professional medical corporation.3California Legislative Information. California Corporations Code 13401.5 – Professional Corporations You can be a shareholder, officer, director, or employee, so long as the total non-physician shares don’t exceed 49 percent. A licensed physician must hold at least 51 percent and retain control over clinical decisions.
The statute lists “registered nurses” among the eligible minority shareholders rather than naming nurse practitioners. NPs qualify through their RN licensure, which sits underneath the NP certification. The route is well established, but your corporate paperwork should clearly identify the RN license as the basis for your shareholder status.
There is also a cap on how many minority shareholders a medical corporation can have. The number of non-physician licensed shareholders cannot exceed the number of physicians in the corporation.3California Legislative Information. California Corporations Code 13401.5 – Professional Corporations A medical spa with one physician owner can bring in at most one NP as a minority shareholder.
Owning the Business Side Through an MSO
Nurse practitioners who want operational and financial control over a medical spa usually land on the management service organization model. It splits the venture into two entities. A physician-owned professional medical corporation handles everything clinical. A separate management company handles everything else, and that management company can be 100 percent owned by a nurse practitioner.
The MSO provides administrative services to the medical corporation under a written Management Services Agreement. Marketing, billing, payroll, HR, the office lease, equipment procurement. The medical corporation pays the MSO a fee for those services. You run the business engine. Clinical decision-making stays on the physician’s side of the wall.
The compliance risk is in how the MSO gets paid. Business and Professions Code Section 650 prohibits paying or receiving compensation as an inducement for patient referrals, and fee arrangements between an MSO and a medical corporation get scrutinized under that statute. The safest structure is a flat monthly fee tied to the fair market value of the services the MSO actually provides. Percentage-of-revenue arrangements are riskier. Section 650(b) does allow percentage-based payments for non-referral services when the amount is “commensurate with the value of the services furnished,” but the Medical Board tends to look at revenue-sharing between MSOs and medical corporations with suspicion, and proving fair market value after the fact is expensive and uncertain. Many healthcare attorneys steer clients away from percentage fees entirely.
The other failure mode is an MSO that drifts into clinical territory. The Medical Board specifically warns against “rent-a-license” arrangements where a physician is a figurehead and the real control sits with an unlicensed entity.4Medical Board of California. The Business of Medicine – Medical Spas If your management company is picking treatment protocols, setting clinical staffing, or deciding which procedures the spa offers, you have built an illegal structure no matter what the contract says.
What AB 890 Changes, and When
Assembly Bill 890, signed in 2020, created two new nurse practitioner categories in California. Any ownership plan built on pre-2023 information is incomplete without these.
- 103 NP: Practices in a group setting with at least one physician and surgeon present. Qualifying requires national certification from an accredited body, certification by the California Board of Registered Nursing, and at least 4,600 hours (roughly three full-time years) of direct patient care in California within five years of applying.5California Board of Registered Nursing. Assembly Bill 890
- 104 NP: May work independently within the population focus of their national certification, without physician supervision. Qualifying requires at least three years or 4,600 hours of practice as a 103 NP in good standing first. The Board of Registered Nursing has said it will not begin certifying 104 NPs until 2026.5California Board of Registered Nursing. Assembly Bill 890
The 104 NP designation is the one that matters for ownership. Because 104 NPs can practice independently, legal commentators have read this as potentially allowing qualified 104 NPs to own and operate medical practices, including medical spas, without a physician holding majority ownership. The reasoning is that CPOM limits ownership to those with independent clinical authority, and 104 NPs now hold that authority within their certified scope.
This is still a developing area. The first 104 NP certifications are expected in 2026, and the Medical Board has not issued formal guidance on how 104 NP authority interacts with medical spa ownership. If you want to pursue this route, you need an attorney with real California healthcare experience, not a form package. The downside of getting the structure wrong includes losing your license.
Clinical Rules That Shape How the Spa Can Operate
Ownership doesn’t change the clinical rules the spa has to run under. If you own 49 percent of the medical corporation or 100 percent of the MSO, your spa still has to comply with the following, and these shape staffing and scheduling from day one.
Business and Professions Code Section 2836.1 requires NPs to furnish drugs or devices only under written standardized procedures developed jointly with the supervising physician.6California Legislative Information. California Business and Professions Code 2836.1 Those protocols spell out which NPs can do which procedures, under what circumstances, and how competence will be reviewed. Supervision does not require the physician to be in the room. It requires that the physician collaborated on the procedures, approved them, and is available by phone when the NP is examining patients.
No physician may supervise more than four nurse practitioners at the same time.6California Legislative Information. California Business and Professions Code 2836.1 A busy medical spa with multiple NP injectors has to staff enough physician oversight to stay under that ratio. Breaking it doesn’t only create risk for the physician; it undercuts the NPs’ authority to perform the procedures, since that authority flows from the supervision.
Before an NP can perform a procedure that uses a prescriptive device on a new patient, the physician must personally examine that patient. The Medical Board requires an “appropriate prior examination” where prescriptive drugs and devices will be used, and this exam cannot be delegated to a registered nurse.4Medical Board of California. The Business of Medicine – Medical Spas A first-time medical spa patient has to see the physician before an NP administers neurotoxin or operates a prescription laser.
The physician in the structure also has to actually do the job. Establishing treatment protocols, ensuring clinical competency, approving medical equipment, retaining ownership of patient medical records.7Medical Board of California. Practice Information The Board has specifically warned against physicians who “simply sign-on, lend their names on paper to a salon or spa, collect ‘up to’ $400 a month, and escape any liability or responsibility for the patients treated by the business.”4Medical Board of California. The Business of Medicine – Medical Spas A paper medical director is an enforcement problem waiting to happen.
Insurance Exposure When You Own
Owning part of a medical spa puts you in a different liability position than working in one as an employee. You are responsible for your own clinical work and potentially exposed to business decisions that affect patient safety. Professional liability insurance is not legally required for NPs in California, but operating a medical spa without it is reckless, and most collaborating physicians and medical corporations will require it as a condition of the arrangement.
Standard policy limits for NPs in aesthetic practice run around $1 million per occurrence and $3 million aggregate, with some medical spa contracts in metropolitan areas requiring more. Aesthetic and independent practice carries higher premiums than primary care work. Confirm in writing that your policy covers the specific procedures you’ll perform, including injectables and laser treatments. Assumptions about coverage have a way of surfacing at the worst moment.
If you eventually practice as an independent 104 NP, you no longer have a supervising physician absorbing part of the clinical liability. The authority that makes ownership possible also leaves you standing alone when something goes wrong. Build that into the insurance planning before you open the doors, not after.
The Structure Most NPs Use Today
For nurse practitioners who want ownership right now, the practical setup combines both of the available routes. You hold up to 49 percent of a professional medical corporation through your RN license. You own 100 percent of a separate management company that provides administrative services to that corporation under a flat-fee MSO agreement. A physician holds at least 51 percent of the medical corporation and genuinely runs the clinical side, including the prior patient examinations, the standardized procedures, and the medical director responsibilities. The two-entity structure has been tested in enforcement and, built properly, keeps both sides of the line clean.
For NPs who already meet the 103 NP requirements and can accumulate the additional three years for 104 NP certification, independent ownership may become possible starting in 2026. The statute authorizing 104 NP independent practice exists; formal guidance on how that authority meets the CPOM doctrine for medical spa ownership does not yet. Anyone pursuing that route early will be shaping the regulatory picture, which is a case for experienced healthcare counsel and some tolerance for ambiguity.