PC-MSO structure in California: how to set it up legally and avoid CPOM violations
Quick answer. The PC-MSO structure is the standard California legal architecture for separating clinical operations from business operations in a medical practice. A licensed-physician-owned Professional Corporation (the PC) employs the physicians, owns the medical records, and makes every clinical decision. A Management Services Organization (the MSO), which can be owned by non-physician investors, owns the equipment and real estate, employs the non-clinical staff, and provides administrative services to the PC under a Management Services Agreement at fair market value. The structure exists because California Business and Professions Code §2400 prohibits non-physicians from owning a medical practice, while Corporations Code §17701.04 prevents LLCs from providing medical services. The PC-MSO model lets outside investors fund the business side legally, provided the MSO never exercises clinical control.
What is a PC-MSO structure?
A PC-MSO is two separate entities that work together. The Professional Corporation is the clinical entity, formed under the Moscone-Knox Professional Corporation Act (Corp. Code §13400 et seq.). It must be owned at least 51 percent by California-licensed physicians under Corp. Code §13401.5. The MSO is a general business entity, usually a corporation or LLC, owned by non-physician investors. The two entities sign a Management Services Agreement that defines what the MSO does for the PC and what the PC pays for those services. The split exists because California Business and Professions Code §2400 prohibits non-physicians from owning a medical practice. The PC-MSO model is the workaround that keeps non-physician capital out of clinical decisions.
Why use a PC-MSO instead of just a Professional Corporation?
Three reasons drive the structure. First, capital. Outside investors, including private equity, family offices, and entrepreneurs, cannot own the clinical PC. They can own the MSO. Second, scalability. One MSO can service multiple PCs across multiple states with different state CPOM rules, while each PC stays compliant locally. Third, succession and exit. Selling a clinical PC is awkward because the buyer must be a licensed physician. Selling the MSO is a clean transaction because non-physicians can own it. Practices that anticipate growth, outside investment, or eventual sale almost always use the structure.
Who can own the PC and who can own the MSO in California?
The PC must be at least 51 percent owned by California-licensed physicians and surgeons. Up to 49 percent of the PC may be owned by allied licensees listed in Corp. Code §13401.5, including registered nurses, nurse practitioners, physician assistants, psychologists, optometrists, chiropractors, podiatrists, and a few others. The count of allied owners cannot exceed the count of physician owners. The MSO has no California ownership restrictions. It can be owned by individuals, LLCs, corporations, partnerships, private equity funds, or any other entity. The MSO can be a Delaware LLC. The MSO can have foreign investors. The MSO can be publicly traded.
How do you set up a PC-MSO structure in California? Step-by-step
- Form the PC with the California Secretary of State, electing the right entity type ('medical corporation' under Moscone-Knox). File the appropriate registration with the Medical Board of California within 30 days of issuance of the initial license to practice.
- Issue PC stock to physician owners and any allied owners within the §13401.5 list. Confirm physician ownership stays at 51 percent or higher.
- Form the MSO as a separate California or Delaware corporation or LLC. There is no requirement that the MSO be a California entity, but if it operates in California it should register as a foreign entity doing business in California.
- Adopt PC bylaws that vest all clinical decisions (diagnosis, treatment, prescribing, clinical staff hiring and firing, medical record content) in physician-owners. Adopt MSO bylaws that exclude clinical authority.
- Have an independent valuation analyst set the fair market value for MSO management fees. Document the FMV memo in the corporate book. Update annually.
- Draft and execute a Management Services Agreement between the PC and the MSO. The MSA defines services, fees, term, termination, and the clinical-non-clinical line. See the MSA drafting article for the controlling terms.
- Set up separate bank accounts. The PC bills patients and payers; the PC pays the MSO management fee. The MSO bills no patients.
- Set up payroll. Clinical staff (physicians, NPs, PAs, RNs delivering care) are PC employees. Non-clinical staff (front desk, billers, marketing) are MSO employees.
- File the PC's Statement of Information and the MSO's Statement of Information with the Secretary of State.
- Conduct an annual CPOM compliance audit (see the 12-item checklist article) and refresh the MSA, bylaws, and standardized procedures.
What can the MSO legally do for the PC?
- Lease the real estate and own the build-out.
- Own and maintain the medical equipment.
- Employ all non-clinical staff: reception, billing, marketing, IT, HR, executive leadership.
- Negotiate and manage vendor contracts (EHR, supplies, lab services).
- Run the billing department, with the PC retaining final authority on coding and write-offs.
- Operate the website and marketing channels, naming the PC and licensed providers per BPC §651.
- Provide management consulting on growth, location strategy, and financial planning.
- Hold the leases, IT contracts, and capital assets that fund the practice's expansion.
What is the MSO not allowed to do?
- Hire or fire physicians for clinical reasons. (Hiring decisions tied to clinical competency belong to the PC.)
- Set clinical protocols, standing orders, or standardized procedures.
- Make coding or billing decisions on individual patient encounters.
- Control the content of medical records.
- Take a percentage of clinical revenue without FMV documentation; percentage-of-collection fees raise BPC §650 fee-splitting issues.
- Decide which payers the PC contracts with on clinical-judgment grounds.
- Approve or reject specific medical equipment based on clinical considerations.
- Hold itself out to the public as 'the medical practice.' Patient-facing communications must name the PC.
What are the most common PC-MSO mistakes that cause CPOM violations?
Five mistakes account for most enforcement risk. First, the MSO sets the management fee as a flat percentage of gross collections with no FMV memo: this looks like fee splitting under BPC §650. Second, the MSA gives the MSO the right to terminate the physician shareholder 'for any reason' without clinical-cause carve-outs: this transfers clinical control. Third, the same individual signs as CEO of both the MSO and the PC with no clinical-vs-business separation in role: the structure looks like a single entity. Fourth, the MSO controls the EHR and patient communications: medical records belong to the PC. Fifth, the MSO runs the website and uses 'our doctors' marketing language without naming the PC: BPC §651 advertising violation.
Comparison: compliant PC-MSO vs non-compliant arrangement
| Element | Compliant | Non-compliant |
|---|---|---|
| PC ownership | 51%+ CA-licensed physicians | Any non-physician majority |
| MSO fee | FMV, documented annually | % of clinical revenue, no FMV memo |
| Clinical decisions | Physician-owners only | MSO involved in protocols or staffing |
| Medical records ownership | PC owns and controls | MSO holds the EHR contract |
| Termination rights | PC can replace MSO; MSO cannot replace clinical staff for clinical reasons | MSO can fire physicians at will |
| Branding | PC named in all patient-facing materials | MSO holds itself out as the practice |
| Tax filing | Separate returns, separate EINs | Commingled finances |
Does the PC-MSO structure work for medical spas, telehealth, and concierge practices?
Yes, with adjustments. Medical spas need particular attention to the medical director relationship and 16 CCR §1364.50 supervision rules for laser procedures. Telehealth practices need careful good-faith-exam protocols and standardized procedures that match the platform's clinical workflow. Concierge and direct-pay practices need to avoid coupling membership fees to clinical service volume in a way that recreates fee-splitting concerns. The basic skeleton (PC owns clinical, MSO owns business, MSA at FMV) holds in all three. The clinical details inside the MSA shift.
Frequently asked questions
Can a private equity firm own a California medical practice?
Not the clinical Professional Corporation. A private equity firm can own the Management Services Organization that provides administrative services to a physician-owned PC. The PE firm cannot exercise clinical control through the MSA. This is the structure most PE-backed California medical platforms use.
How much should an MSO charge the PC in management fees?
The fee must be fair market value, supported by a written valuation memo. The fee can be structured as a flat dollar amount, a cost-plus arrangement, or a percentage tied to non-clinical revenue. Percentage-of-clinical-revenue fees without FMV support raise fee-splitting concerns under California Business and Professions Code §650.
Can one MSO serve multiple PCs?
Yes. A single MSO can contract with multiple physician-owned PCs across different specialties or geographies. Each PC needs its own Management Services Agreement, and each MSA must be at fair market value for the services that specific PC receives. This is how multi-state physician platforms scale.
Do I need a separate MSA for every state I operate in?
Each state has its own CPOM rules. California is among the strictest. A PC-MSO structure compliant in California will generally pass in less strict states, but the MSA terms, ownership rules, and allowed allied owners differ. Practices operating in multiple states usually have one MSO contracting with multiple state-specific PCs.
What is the most common reason a PC-MSO structure fails an audit?
Clinical control bleed. The MSO ends up making decisions that California regulators consider clinical: which physicians to hire, what protocols to follow, what equipment to buy on clinical grounds, how to bill specific cases. The fix is tight MSA drafting, role separation, and an annual compliance audit.