Key Points for California Practice Owners
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Compliant DSO affiliation in California uses a PC-MSO structure where the dentist-owned PC keeps clinical control and the MSO handles only non-clinical support.
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SB 351, effective January 1, 2026, codifies the corporate practice of dentistry doctrine and voids contract terms that let MSOs interfere with clinical judgment.
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California’s visible DSO affiliation rate is 5.1% based on public records, although the true rate is likely higher because many PC-MSO structures are not obvious on paper.
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Compliant structures can require flat or cost-plus management fees, clear dentist authority over clinical decisions, and no contractual rights for MSOs to replace practice owners.
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California practice owners considering DSO affiliation can schedule a free, confidential discovery call with McLerran & Associates to review options and discuss compliance.
How DSO Affiliation Differs from Corporate Dentistry in California
Compliant DSO affiliation and prohibited corporate dentistry are legally distinct in California. Corporate dentistry occurs when a non-dentist entity directly owns the dental practice, employs dentists in their clinical role, and directs treatment decisions. California strictly prohibits non-dentists from owning dental practices and actively enforces corporate practice rules.
Compliant DSO affiliation instead uses a PC-MSO structure. The dentist-owned professional corporation holds the license and retains clinical control. The MSO, which is the DSO’s management entity, provides only non-clinical services. This PC-MSO separation allows the practice to remain dentist-owned while the management entity handles administrative operations. That separation serves as the legal mechanism that distinguishes compliant affiliation from prohibited corporate ownership.
What Compliant DSO Affiliation Looks Like in California
In a compliant California PC-MSO affiliation, the dentist-owned professional corporation keeps ownership of the clinical license, employs the clinical team, and bills patients. The MSO, owned by the DSO or its investors, provides a defined set of non-clinical services under a written management services agreement (MSA).
Non-clinical services the MSO may lawfully provide include:
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Patient billing and insurance claims processing
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Accounting, payroll, and human resources administration
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Recruiting for non-clinical roles
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Marketing, SEO, and patient communications
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IT support and technology infrastructure
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Equipment procurement and supply chain management
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Real estate and lease negotiation
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Compliance and OSHA training
The DSO is limited to these non-clinical support functions, which preserves dentist decision-making over patient care, treatment planning, and clinical staff management. This limitation means the dentist retains full authority over diagnosis, treatment planning, clinical scheduling, and the hiring and evaluation of licensed clinical staff. Compliant DSOs often maintain clinical boards and clinician-led governance structures so practicing dentists, not non-clinical managers, control clinical decisions.
DSO Affiliation Legality in California Under SB 351
Compliant PC-MSO affiliation remains legal in California in 2026. SB 351 codifies existing restrictions and clarifies boundaries rather than banning affiliation.
SB 351 expressly prohibits private equity groups, hedge funds, and the MSOs they control from interfering with or directing a dentist’s professional clinical judgment. This includes patient scheduling, clinical staff hiring and firing, ownership of medical records, billing and coding practices, and selection of equipment and supplies. Any contract terms that enable impermissible interference are void, unenforceable, and against public policy, and the California Attorney General can seek injunctive relief and recover attorney’s fees.
Regulators evaluate PC-MSO relationships under a totality-of-the-circumstances approach, which means the full operational picture matters, not just the written contract.
How Common DSO Affiliation Is in California
ProviderSignal’s public-records analysis places California’s visible DSO affiliation rate at 5.1%. This figure represents a verifiable floor, because some affiliations leave no public trace when practices operate under unrelated local professional corporation names. The ADA Health Policy Institute’s 2024 survey reports a national self-reported affiliation rate of 16.1%. That national benchmark suggests the true California rate likely sits meaningfully above the public-records floor. The gap between the 5.1% visible floor and the national self-reported benchmark reflects the structural opacity of PC-MSO arrangements rather than an absence of activity.
Comparing Compliant and Non-Compliant PC-MSO Structures
The table below summarizes key structural differences between compliant and non-compliant PC-MSO arrangements under California law as of 2026.
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Dimension |
Compliant Structure |
Non-Compliant Structure |
Post-SB 351 Risk |
|---|---|---|---|
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Management fee basis |
Flat fee, cost-plus, or documented FMV percentage under B&P Code § 650(b) |
Fee tied to revenue, sales, or profit |
Contract void, Attorney General injunctive action, civil penalties |
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Clinical control |
Licensed dentist retains ultimate authority over all professional matters per settlement framework |
MSO directs scheduling, staffing, or treatment decisions |
SB 351 violation, void contract, Attorney General enforcement |
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Ownership replacement rights |
PC owner may terminate MSA without losing practice ownership |
MSO holds contractual right to replace PC owner |
Pending appellate review, Attorney General amicus opposition |
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Non-compete / gag clauses |
Absent or limited; SB 351 renders non-competes and non-disparagement clauses unenforceable in PE-backed MSO agreements |
Broad non-compete and non-disparagement provisions |
Void and unenforceable under SB 351 |
How McLerran & Associates Supports California Sellers
McLerran & Associates is a dental-specific, sell-side-only advisor, so its sole client is the practice owner, not the buyer. For California owners evaluating DSO affiliation, the firm prepares a side-by-side valuation that shows the practice’s value in both the private-buyer and DSO markets. The team then runs a structured, auction-style bid process among a vetted pool of qualified buyers, which can often produce multiple competing offers within 45 to 60 days.
Every engagement begins with a CPA-led EBITDA analysis. EBITDA stands for earnings before interest, taxes, depreciation, and amortization, and it serves as a standard measure of a practice’s underlying operating profitability. McLerran’s goal is to build an EBITDA presentation that holds up under buyer scrutiny and reduces the risk of later price reductions.
California’s post-SB 351 environment can make sell-side representation more consequential. An owner negotiating directly with a single DSO may have limited visibility into whether that buyer’s proposed MSA terms are compliant, no competitive tension to support price, and no advocate to defend the EBITDA story during diligence. McLerran addresses each of these gaps and has blacklisted DSOs known for poor post-close environments, so structurally problematic buyers do not reach the table.
Schedule a free, confidential discovery call with McLerran & Associates to discuss your practice, your goals, and how a compliant affiliation could fit into your transition plan.
Frequently Asked Questions
Does SB 351 create a risk that my existing MSO agreement will be voided?
SB 351, effective January 1, 2026, renders void and unenforceable any contract terms that enable impermissible interference with a dentist’s clinical judgment, including provisions in agreements signed before that date. If your existing management services agreement contains clauses that give the MSO control over clinical staffing, scheduling, billing practices, or equipment selection, those specific provisions may be unenforceable as of January 1, 2026, regardless of when the contract was executed. The broader agreement is not automatically voided in full, but non-compliant provisions within it can carry meaningful legal risk. Practice owners with existing MSO agreements may want qualified healthcare counsel to review the specific terms against SB 351’s prohibitions and the California Attorney General’s 2026 enforcement guidance before assuming compliance.
What documentation is required to support a fair-market-value management fee?
A defensible fair-market-value (FMV) analysis for a California MSO management fee is a written document, not a verbal understanding. It typically identifies the specific non-clinical services the MSO provides, the costs incurred in delivering those services, market comparables drawn from recognized surveys, the methodology used to arrive at the fee, and the credentials of the appraiser who prepared it. Healthcare-credentialed valuation professionals are commonly used for this work.
The analysis should be prepared at the start of the affiliation and refreshed annually. A fee that reflects FMV in year one can drift out of compliance in year five if the MSO’s actual services have not kept pace with practice growth. Percentage-of-revenue arrangements can require particularly careful annual review, because revenue growth without a corresponding increase in services provided can shift the FMV analysis against the practice owner.
Are non-compete clauses in DSO affiliation agreements enforceable in California after SB 351?
SB 351 expressly renders non-compete clauses and non-disparagement clauses unenforceable in MSO or investor-backed agreements with California dentists. California has long been hostile to non-compete agreements under Business and Professions Code § 16600, and SB 351 reinforces that position in the DSO affiliation context. A practice owner who signed an MSO agreement containing a non-compete before January 1, 2026, should not automatically assume that clause is enforceable against them. The specific language of any agreement still matters, and qualified healthcare counsel can review the terms before a practice owner acts in reliance on unenforceability.
How does California regulators’ totality-of-the-circumstances approach affect my affiliation risk?
California regulators, including the Attorney General, do not evaluate PC-MSO arrangements by checking a single statutory box. They look at the full operational picture, such as who actually controls scheduling, who sets clinician compensation, who owns the real estate, how the management fee is structured, whether the practice owner is genuinely present and practicing, and whether the branding clearly identifies the licensed dentist as the practice owner. A written MSA that appears compliant on its face can still draw enforcement attention if day-to-day operations tell a different story.
This approach helps explain why the 2026 Aspen Dental settlement included three years of compliance monitoring and detailed injunctive provisions covering advertising, lease assignments, and staff compensation, not just the management fee. Practice owners can treat compliance as an ongoing operational discipline rather than a one-time contract review.
How does McLerran & Associates help California owners evaluate DSO affiliation without steering them toward a specific buyer?
McLerran & Associates operates as a sell-side-only advisor, so it does not represent buyers. As described earlier, the firm focuses on preparing owners with clear valuations and a competitive bid process. That structure can help owners evaluate DSO affiliation from a position of strength rather than under pressure from a single buyer’s timeline or preferred structure.
Buyers known for poor post-close environments or structurally problematic MSA terms are excluded from McLerran’s process. The owner selects the buyer and structure that best fit their financial goals and personal priorities. Schedule a free, confidential discovery call with McLerran & Associates to explore whether a DSO affiliation, private sale, or continued independent ownership aligns best with your plans.
