The corporate practice of medicine doctrine determines who can legally own a medical practice, and it catches more founders off guard than any other rule in healthcare. If you’re structuring a med spa, a telehealth company, or a multi-state clinic, CPOM determines whether your ownership model is legal before you sign a single lease. This guide walks through what the doctrine restricts, how the PC/MSO model works around it, and why state rules matter more than any generic checklist. At Medical Director Co., we help healthcare businesses pair compliant ownership structures with licensed medical direction, so we see these questions from founders every week.

What the Corporate Practice of Medicine Doctrine Actually Restricts

CPOM emerged in the early 1900s after state medical boards pushed back against companies that employed physicians and steered treatment decisions toward profit. The doctrine keeps licensed physicians, not outside owners, in control of clinical decisions. States enforce it through statutes, case law, medical board policy, and attorney general opinions, so the specific restrictions differ by state.

CPOM doctrine typically restricts three things:

• Ownership: Non-physicians can’t own equity in a professional medical corporation.
• Clinical control: Non-physician managers can’t direct diagnosis, treatment plans, or which tests a patient receives.
• Fee-splitting: A non-physician entity can’t take a cut of medical revenue instead of a flat fee for its services.

The dividing line runs through control, not just paperwork. A management agreement that lets an MSO set schedules, dictate case volume, or influence diagnosis can violate CPOM even when the ownership documents look compliant on their face. That distinction is exactly what the PC/MSO structure is built to preserve.

The PC/MSO Model, Explained Simply

The PC/MSO model splits a healthcare business into two separate entities: a professional corporation and a management services organization. The professional corporation, owned by a licensed physician, controls every clinical decision. The management services organization, owned by non-physician investors or operators, controls the administrative and business side.

Here’s what each entity handles:

• Professional Corporation (PC): Holds the medical license and controls patient care, diagnosis, treatment decisions, and medical staffing.
• Management Services Organization (MSO): Handles billing, marketing, HR, IT, and facility operations, and can be structured as a standard corporation or LLC.
• Management Services Agreement: Connects the two entities, routes patient revenue through the PC first, and sets a flat or cost-plus fee for the MSO’s services.

Percentage-based or profit-linked MSO fees are the most common reason this structure fails a compliance review, since they start to resemble fee-splitting instead of a management fee. Building the agreement with a physician-side partner from our medical director services, not just a business attorney, catches that problem before a regulator does.

States That Enforce CPOM vs. States That Don’t

CPOM enforcement isn’t uniform, and the exact number of states that recognize it depends on which source you ask. 2024 through 2026 marked a tightening cycle, driven largely by concern over private equity ownership of medical practices. California, Texas, and New York enforce CPOM strictly, while states like Indiana have no CPOM restriction at all.

Here’s how a few key states compare:

A handful of other states apply CPOM only to specific practice types or enforce it loosely enough that violations rarely trigger board action. That inconsistency is why multi-state operators build their compliance calendar around legislative session dates instead of a static list, since a single bill can turn a permissive state strict overnight. If you’re structuring in California specifically, review the state’s medical director requirements for med spas before you finalize anything.

How CPOM Interacts With Practice Authority and Oversight

Founders often lump CPOM, practice authority, and physician oversight into one rule, but they answer three separate questions. Confusing the three is how compliant-looking businesses end up non-compliant. Each one requires its own check, since satisfying one doesn’t satisfy the others.

Here’s what each rule actually governs:

• CPOM: Determines who can own and control the business, not what a clinician can do inside it.
• Practice Authority: Determines what a nurse practitioner or physician assistant can do without a physician present, and it varies by state regardless of ownership.
• Physician Oversight: Determines how closely a physician must supervise or collaborate with other clinicians, ranging from a formal collaboration agreement to direct supervision for specific procedures.

A business that satisfies CPOM can still violate practice authority or oversight rules, since a compliant ownership structure says nothing about who’s legally allowed to treat a patient without a physician present. Running all three checks as one compliance review, rather than treating CPOM as the finish line, is what keeps a multi-state operation defensible as it scales.

How Medical Director Co. Supports Compliant Ownership Structures

At Medical Director Co., we handle the physician side of the equation once your ownership structure is in place. We place licensed, in-house medical directors who can serve as the physician-owner or medical director inside your PC, matched to your state’s specific requirements. Placement typically takes 24 hours, or 12 hours in Texas, and pricing runs $799 a month, all-in.