California Professional Corporation Formation for Med Spas

A California Medical Corporation must be formed under the Moscone-Knox Professional Corporation Act: not a PLLC, not an LLC, and not a general business corporation.

A California Medical Corporation is a professional corporation that delivers medical services in California, formed under the Moscone-Knox Professional Corporation Act at Cal. Corp. Code §13400 et seq. California requires medical practices to operate as Professional Corporations, and the Medical Corporation is the specific PC type used for physician-led care. Founders structuring a California med spa cannot skip the PC step; the Secretary of State will reject filings that omit the Moscone-Knox-specific statement, and downstream regulatory inquiries will surface non-compliant structures.

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California Requires a Professional Corporation for Medical Services

California’s Moscone-Knox framework restricts which types of entities can deliver medical services.

The Professional Corporation is the required vehicle for the clinical side; LLCs and other entity types are available for the MSO side only.

Entity types California does not allow for medical services:

Professional Limited Liability Companies (PLLCs), prohibited under §17701.04(e) regardless of home-state recognition.
Standard LLCs, which cannot render professional services requiring licensure.
General business corporations under the General Corporation Law, which lack Moscone-Knox shareholder restrictions.
Foreign PCs without California qualification, which lose the Moscone-Knox liability and licensure structure on California operations.

PLLC attempts in California are void under §17701.04(e). They provide no liability shield, no Moscone-Knox protection, and no compliant pathway to deliver medical services. Out-of-state operators arriving with home-state PLLC structures must reform under Moscone-Knox before California operations begin.

Moscone-Knox Basics

The Moscone-Knox Professional Corporation Act, Cal. Corp. Code §13400 through §13410, defines two parallel tracks for professional corporations: Medical Corporations and other professional corporation types. The two tracks share most Moscone-Knox provisions but diverge on the certificate-of-registration question.

Medical Corporations Under Moscone-Knox

Formed under Cal. Corp. Code §13400 et seq. to render medical services through MBC-licensed physicians.

Medical Corporations rendering services through MBC-licensed physicians do not need a separate MBC certificate of registration under Cal. Corp. Code §13401(b). This carve-out distinguishes Medical Corporations from other PC types and simplifies the MBC interface.

Other Professional Corporations Under Moscone-Knox

Legal, dental, accounting, optometry, psychology, and other professional corporation types use the same Moscone-Knox framework but require board-issued certificates of registration to deliver services.

Out-of-state attorneys advising on California formation frequently apply the certificate-of-registration requirement to Medical Corporations as well. The §13401(b) exception removes that step specifically for Medical Corporations.

Shareholder Eligibility: Three Tiers

Beyond the certificate-of-registration mechanics, Moscone-Knox’s most consequential restrictions sit in its shareholder rules, which determine who can hold equity in a California Medical Corporation.

Tier 1: Licensed Physicians

MD and DO physicians licensed by the Medical Board of California hold unlimited shares. Single-physician PCs are permitted. Physician shareholders must hold a majority of shares.

Tier 2: Allied Healthcare Professionals

NPs, PAs, RNs, psychologists, optometrists, and others on the §13401.5(a) qualifying list. Combined cap of 49 percent. Cannot outnumber physician shareholders.

Tier 3: Non-Licensed Individuals

Excluded from PC equity. Narrow exception for assistant secretary or assistant treasurer roles without equity or governance authority. Non-licensed founders route through the MSO side.

Statutory references for shareholder eligibility: Cal. Corp. Code §13401 (licensed-person requirement); Cal. Corp. Code §13401.5 (allied healthcare professional shareholders, 49 percent cap). The §13401.5(a) qualifying-profession list is amended periodically as the legislature adds professions; verify the current list before structuring multi-shareholder PCs with allied-pro equity.

For NPs and PAs structuring as both shareholders and treating practitioners, the supervisory framework runs in parallel. If your clinic also needs a collaborating physician for its NPs or PAs, MedSpire provides that oversight.

What Articles Must Include

Articles of incorporation for a California Medical Corporation must include a specific statement that the corporation is a professional corporation within the meaning of the Moscone-Knox Act. The Secretary of State rejects filings that omit this statement. Articles that pass the SOS filing but lack the proper Moscone-Knox framing can still fail downstream regulatory inquiry, which is materially harder to fix.

The corporate name must designate the entity as a professional corporation where the statute requires, typically in a format such as ‘[Name] Medical Corporation’ or ‘[Name], a Professional Medical Corporation.’ A registered agent in California is required, and the initial directors named in the articles must be qualifying licensed shareholders under §13401.

The Secretary of State filing creates the entity but, by itself, does not authorize the corporation to deliver medical services. Authority to deliver medical services traces to the physician shareholders’ MBC licensure and the Moscone-Knox framework. See the MedSpire medical director overview for the cluster’s coverage of the medical director’s licensed-physician role.

Articles Content Checklist

Item 1: Corporate name with required professional corporation designation

Item 2: Moscone-Knox specific statement

Item 3: Statement of professional services rendered

Item 4: Registered agent and California address

Item 5: Initial directors who are qualifying licensed persons

The MSO-Side Counterpart and 2026 Considerations

The Professional Corporation does not operate alone in a CPOM-compliant structure. It sits paired with a Management Services Organization that handles non-clinical operations under a written management services agreement. Two California laws effective January 1, 2026, reshape what the MSO and PC can do when the operator carries institutional capital.

What the MSO Does

Provides administrative services to the PC under a written management services agreement: billing, marketing, HR, facilities, IT, vendor management. Typically formed as an LLC owned by non-physician operators or investors. Does not deliver medical services and does not employ treating physicians.

What the MSA Can Allocate

Administrative authority, including operational policies, facilities decisions, vendor selection, and back-office staffing. Compensation structured to satisfy §650 (fee-splitting) and the CPOM framework. Fixed monthly or annual fees are common.

What the MSA Cannot Allocate

Clinical decision-making, standing orders, treatment protocols, hiring and firing of clinical staff, standard of care decisions. Compensation tied to clinical revenue in ways that give the MSO effective control of medical decisions raises CPOM and §650 fee-splitting concerns.

SB 351 Considerations (Effective January 1, 2026)

California SB 351 extends California’s CPOM doctrine into statute at Health and Safety Code §1190 through §1192. It applies wherever a private equity group or hedge fund is involved in any manner with a physician or dental practice, and it does not change who may own a practice. What it prohibits is control: interfering with professional judgment on diagnostic tests, referrals, treatment options, and patient volume, and controlling medical records, clinical hiring and firing, payer contracting, coding and billing, or equipment selection. It also voids non-compete and non-disparagement clauses that keep a physician from commenting on quality of care. The Attorney General can seek injunctive relief and recover fees, and the law creates no private right of action. Practices forming a PC with PE-affiliated capital must evaluate their MSA, physician compensation, and any non-compete or non-disparagement clauses against SB 351 before closing.

AB 1415 OHCA Notice (Effective January 1, 2026)

California AB 1415 expands OHCA’s pre-transaction notice requirements to cover PE groups, hedge funds, management services organizations, and newly created entities. Noticing entities must file at least 90 days before closing a material change transaction. PC formation in isolation typically does not trigger AB 1415; MSO formation paired with PE or hedge fund capital often does. Current as of August 2026. SB 351 and AB 1415 both took effect January 1, 2026. Next review: February 2027.

Substantive constraints on the PC-MSO relationship: California CPOM at Cal. Bus. & Prof. Code §2400 (corporate practice prohibition) precludes lay control of medical decisions through the MSA. Compensation arrangements between PC and MSO interact with Cal. Bus. & Prof. Code §650 (fee-splitting). The deeper MSA mechanics are covered on MedSpire’s MSO-PC framework page, and clinics that need California medical director oversight receive it through MedSpire’s medical corporation.

How MedSpire Delivers a Compliant California Structure

Forming the Professional Corporation correctly is one step. The harder work is pairing it with an MSO under a defensible management services agreement and keeping the structure sound as the practice grows. MedSpire delivers that as a packaged service: you do not form, own, or staff the medical entity yourself.

1. Discovery and Structure Assessment

A discovery call to map your ownership, capital stack, services, and growth plans. We confirm whether you need a new compliant structure or remediation of an existing one.

2. Physician-Owned Medical Corporation, Supplied

MedSpire provides the California professional medical corporation that holds the clinical side, already owned by a California-licensed physician and formed under Moscone-Knox with the §13401.5(a) shareholder structure. You do not form or own the medical entity.

3. MSO-PC Structure and MSA

MedSpire structures the management-services relationship between that medical corporation and your business under an MSA built to California CPOM and §650 fee-splitting constraints, with clinical decision-making left entirely on the physician side.

4. Ongoing Compliance Support

As you add service lines, enter new states, or take on institutional capital, we evaluate the structure against current CPOM and the 2026 SB 351 and AB 1415 layer, and adjust as needed.

Three Formation Failures Account for Most CPOM Enforcement

Founders structuring California Medical Corporations encounter the same three failure patterns. Each is preventable at formation; each is materially more expensive to remediate after operations begin.

Failure 1: PLLC formation attempts

Operating a medical practice through a PLLC or LLC in California is void under §17701.04(e). The only fix is reformation under Moscone-Knox before California operations begin.

Failure 2: Articles missing the Moscone-Knox-specific statement

The Secretary of State typically catches this at the time of filing. Articles that pass SOS review but lack proper Moscone-Knox framing can still fail downstream regulatory inquiry. An amendment is a procedural fix; the harder problem is when missing-statement articles have been operating for years.

Failure 3: Non-licensed shareholders in the PC

Violates §13401 directly. The corporation faces dissolution exposure, and the physician shareholders face CPOM disciplinary exposure. Discovered through SOS filings, regulatory inquiry, payer audits, or M&A diligence. Practices uncertain about their PC structure can begin with a compliance audit before the MBC inquiry surfaces the problem.

Retroactive remediation is workable when caught early. The work is slower and more expensive than initial structuring, but materially less expensive than defending an MBC enforcement action or absorbing payer-audit recoupment of paid claims.

Frequently Asked Questions

Can I use an LLC instead of a PC for my California med spa?

No. California prohibits Professional Limited Liability Companies for healthcare services under Cal. Corp. Code §17701.04(e). The Professional Corporation is the required entity for delivering medical services in California and is formed under the Moscone-Knox Professional Corporation Act. LLCs and other entity types are available for the MSO side, which provides administrative services to the PC but does not deliver medical care. Out-of-state founders often assume a PLLC is workable because their home state permits it; California does not.

Can an NP be a shareholder of a California Medical Corporation?

Yes, up to 49 percent of total shares under Cal. Corp. Code §13401.5(a). Nurse practitioners are on the statutorily qualifying list of allied healthcare professionals who can hold shares in a Medical Corporation. Allied-professional shareholders combined cannot exceed 49 percent of total shares AND cannot outnumber physician shareholders. An NP can be a 49 percent shareholder of a single-physician PC but cannot be a sole or majority owner. Full Practice Authority under AB 890 does not change the Moscone-Knox ownership rules.

Can a non-physician be a shareholder of a California Medical Corporation?

No. Non-licensed individuals cannot hold equity in a California Medical Corporation. The Moscone-Knox shareholder rules under §13401 require shareholders, officers, and directors to be licensed persons. Narrow exceptions exist for assistant secretary or assistant treasurer positions that do not carry equity or governance authority. Non-physician founders take the MSO side of the structure: they own the LLC that provides administrative services to the PC and retain administrative authority without holding equity in the clinical entity.

Do I need a certificate of registration for a California Medical Corporation?

No. Medical Corporations rendering services through MBC-licensed physicians do not need a separate MBC certificate of registration under Cal. Corp. Code §13401(b). This is a carve-out specific to Medical Corporations. Other professional corporation types (legal, dental, accounting, others) typically require certificates from their respective licensing boards. Out-of-state attorneys advising on California formation frequently miss this exception and add unnecessary filing steps.

Will SB 351 affect my California PC if I take PE money?

Potentially, yes. SB 351 (effective January 1, 2026) reinforces CPOM restrictions on private equity and hedge fund involvement in physician practices and authorizes the California Attorney General to seek injunctive relief for violations. It does not create a private right of action. Practices forming a PC with PE-affiliated capital must evaluate their MSA, physician compensation, and any non-compete or non-disparagement clauses against SB 351 before closing. The structural answer is still MSO-PC, but the MSO side now faces tighter scrutiny when the capital source is a PE or hedge fund. AB 1415 OHCA notice requirements may also apply.

What happens if my California Medical Corporation has non-licensed shareholders?

The corporation faces dissolution exposure, and the physician shareholders face CPOM disciplinary exposure. Non-licensed equity in a Medical Corporation directly violates §13401. Discovery typically occurs through Secretary of State filings, regulatory inquiry, payer audits, or M&A diligence. Remediation involves restructuring the shareholder roster to all licensed parties, which is workable when caught early but increasingly difficult after PE capital, multi-year operations, or M&A activity has layered complexity onto the cap table.

Can I retroactively fix my California PC structure?

Yes, but it costs more than getting it right at launch. Retroactive remediation involves restructuring the shareholder roster, amending the articles if the Moscone-Knox statement is missing, drafting or revising the MSA to satisfy current §650 and CPOM standards, and rebuilding the operational handoffs between the PC and the MSO. A compliance audit is the practical starting point. Retroactive work is slower and more expensive than initial structuring but materially less expensive than defending an MBC enforcement action.

What if my Medical Corporation articles are missing the Moscone-Knox statement?

The Secretary of State typically catches this at the time of filing and rejects the articles. Articles that pass SOS review but lack the proper Moscone-Knox framing can still fail downstream regulatory, payer, or M&A diligence. Amending articles to add the Moscone-Knox statement is a procedural fix at the Secretary of State level. The harder problem is when missing-statement articles have been operating for years, and downstream filings, contracts, or transactions referenced the deficient entity; those may need parallel remediation.

Get Your California Structure Right the First Time

California Medical Corporation formation runs through the Moscone-Knox Professional Corporation Act, the §13401.5(a) allied-pro cap, and the §17701.04(e) PLLC prohibition. Rather than form and own the medical entity yourself, MedSpire provides the physician-owned corporation, pairs it with your business under a compliant management services agreement, and works through the 2026 SB 351 and AB 1415 layer when institutional capital is involved.

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