The Supervising Physician Relationship: How It Shapes Your PA Liability

The PA-Physician Supervisory Model

The physician assistant profession was built on a distinctive foundation: PAs practice medicine under the supervision of a licensed physician. This is not merely a cultural norm or a workplace preference — it is the legal framework that has defined the PA profession since its inception in the 1960s. And it has profound consequences for how liability works when something goes wrong.

In most states, the supervisory relationship is formalized through a written supervisory agreement (sometimes called a collaborative agreement or delegation agreement). This document is not a formality. It is the legal instrument that defines:

• Scope of practice — which clinical services the PA is authorized to perform
• Prescriptive authority — which medications the PA can prescribe, including schedule restrictions
• Chart review requirements — how frequently the supervising physician must review the PA’s patient encounters
• Consultation protocols — when the PA must consult with or refer to the supervising physician
• Geographic and temporal limitations — whether the physician must be on-site, and how many PAs one physician can supervise

The practical reality of this model varies enormously. In some settings, the supervising physician works alongside the PA daily and reviews charts in real time. In others — particularly rural practices and urgent care centers — the supervising physician may be miles away, reviewing charts remotely on a weekly or monthly basis. Both arrangements can be legally compliant, depending on state law. But both create distinct liability exposures.

The model is evolving. The Optimal Team Practice (OTP) movement, led by the American Academy of PAs (AAPA), is pushing to eliminate mandatory supervisory agreements in favor of a collaborative, team-based model without legal oversight requirements. Several states have already adopted OTP frameworks. But even in these states, the liability implications of the PA-physician relationship remain complex — and in some ways become more complicated, not less.

How Vicarious Liability Works

The legal concept that most directly shapes PA liability is respondeat superior — Latin for “let the master answer.” Under this doctrine, the supervising physician is legally responsible for the acts and omissions of the PA, provided those acts occurred within the scope of the supervisory relationship.

For vicarious liability to attach to the supervising physician, three elements must typically be present:

1. A wrongful act by the PA — the PA committed a negligent clinical act or omission that caused patient harm
2. Within the scope of employment or agreement — the negligent act occurred while the PA was performing duties authorized by the supervisory agreement
3. A master-servant relationship — the supervising physician had the right to control how the PA performed clinical work (the “right of control” test)

The critical element is the “right of control” test. Courts do not require that the supervising physician actually directed the specific clinical decision that went wrong. They ask whether the physician had the right to control the PA’s work — which, by the nature of the supervisory agreement, the answer is almost always yes.

This means that in the majority of PA malpractice cases, both the PA and the supervising physician are named as defendants. Even if the physician was not present during the patient encounter, even if the physician’s own clinical judgment was sound, the physician can be held liable for the PA’s negligence simply because the supervisory relationship existed.

Direct vs. Vicarious Liability: The Critical Distinction

Understanding the difference between direct and vicarious liability is essential for every PA — because it determines who pays, who gets reported to the NPDB, and whose insurance responds first.

Direct Liability (the PA)

Direct liability means the PA personally committed a negligent act. The PA misdiagnosed a condition, prescribed the wrong medication, failed to order appropriate tests, or otherwise fell below the standard of care. In a direct liability claim, the PA is the primary defendant. The PA’s own malpractice insurance responds first. The PA’s name is reported to the National Practitioner Data Bank (NPDB) if the claim results in a payment.

Vicarious Liability (the Supervising Physician)

Vicarious liability means the supervising physician is held liable for the PA’s negligence — even though the physician personally did nothing wrong. The physician did not see the patient. The physician did not make the clinical decision. But because the physician had the right of control over the PA’s practice, the law imposes liability on the physician.

This is not a theoretical risk. It is the standard legal framework applied in the majority of PA-related malpractice litigation.

Failure to Supervise (Direct Liability on the Physician)

There is a third category that blends the two. When a supervising physician fails to provide adequate oversight — does not review charts on the required schedule, does not establish appropriate consultation protocols, or allows a PA to practice beyond their competence — the physician faces direct liability for negligent supervision. This is distinct from vicarious liability: the physician’s own conduct (inadequate oversight) is the negligent act.

State medical boards can also sanction physicians for improper PA supervision, including:

• Failing to meet chart review requirements
• Supervising more PAs than state law permits
• Failing to maintain an active supervisory agreement
• Allowing PAs to practice beyond the scope defined in the agreement

State-by-State Variation

PA supervision requirements and their liability consequences vary dramatically from state to state. The following cases and rules illustrate how different jurisdictions approach the issue:

Georgia: Zeh v. Maso

In this significant Georgia case, the court examined whether a supervising physician could be held vicariously liable for a PA’s negligent act. The court ultimately protected the supervising physician from vicarious liability, finding that the specific facts of the supervisory relationship did not satisfy the “right of control” test. This case is frequently cited by defense attorneys arguing that the mere existence of a supervisory agreement does not automatically create vicarious liability — the physician must have had actual control over the PA’s clinical decisions.

Tennessee: Watkins v. Affiliated Internists

Tennessee took the opposite approach. In Watkins, the court found that violating the state’s PA supervision rules constituted negligence per se — meaning the violation of the supervision statute was itself proof of negligence, without requiring the plaintiff to separately prove that the standard of care was breached. This makes Tennessee a high-risk state for supervisory liability: any deviation from the supervision rules creates automatic liability exposure.

Pennsylvania: Strict Chart Review

Pennsylvania imposes some of the most stringent supervision requirements in the country. Supervising physicians must countersign 100% of PA charts within 10 days. This is not a spot-check requirement — every single patient encounter must be reviewed and signed by the supervising physician. Failure to meet this requirement exposes the physician to direct liability for negligent supervision and potential board action.

OTP States: South Dakota’s Model

South Dakota was among the early states to move toward Optimal Team Practice. After a PA accumulates 6,000 hours of supervised practice, the state eliminates the mandatory collaboration requirement. The PA can then practice under a collaborative agreement model that does not require physician oversight of day-to-day clinical decisions. This shifts more liability directly onto the PA and reduces (but does not eliminate) the supervising physician’s exposure.
Know Your State: Before you sign a supervisory agreement or change practice settings, review your state’s specific PA practice act. Requirements for chart review frequency, physician-to-PA ratios, prescriptive authority limitations, and on-site supervision rules vary widely and change frequently. Your state PA board website is the definitive source.

Insurance Implications of the Supervisory Relationship

The PA-physician supervisory model creates insurance considerations that are unique to the PA profession. Getting this right is one of the most important financial decisions you will make in your career.

Shared Limits vs. Separate Limits

Some practice arrangements place the PA under the supervising physician’s malpractice policy with shared coverage limits. In a shared-limits arrangement, both the PA and physician draw from the same per-occurrence and aggregate limits. If a single claim names both parties — which, as we have discussed, is the norm — the shared limits must cover defense costs and damages for both defendants.

This is a dangerous structure. A $1M/$3M policy shared between a PA and physician provides significantly less protection than the same limits on two separate policies. Defense costs alone for two defendants can exhaust a substantial portion of shared limits before any damages are paid.

Coordinating Coverage

When a PA and supervising physician carry separate policies from different insurers, coordination issues arise. Which insurer responds first? How are defense costs allocated? What happens if one policy is claims-made and the other is occurrence? These questions are resolved through the policies’ “other insurance” clauses, but the process can delay defense and create gaps if not managed proactively.

Additional Insured vs. Named Insured

Some PAs are added to their supervising physician’s policy as an Additional Insured rather than carrying their own Named Insured policy. The difference is significant:

• Named Insured — you are a primary party to the policy, with direct rights to defense, settlement decisions (if the policy includes consent-to-settle), and policy proceeds
• Additional Insured — you are covered under someone else’s policy, with limited control over defense strategy and no independent right to direct the claim response

Being an Additional Insured on your physician’s policy is better than having no coverage at all — but it is not a substitute for your own individual policy.

Tail Coverage When Supervisory Relationships Change

When you change supervising physicians, change employers, or move to a new state, the malpractice coverage attached to your prior supervisory relationship may end. If that coverage was claims-made, you need tail coverage (an Extended Reporting Period endorsement) to protect against claims filed after the relationship ends for incidents that occurred during it.

Key questions to resolve before any supervisory transition:

1. Was the prior coverage claims-made or occurrence?
2. If claims-made, who is responsible for purchasing tail — you or the employer?
3. What is the tail premium, and is there a time limit to purchase it?
4. Does your new position provide nose coverage (prior acts coverage) that picks up where the old policy left off?

The OTP Movement and What It Means for Liability

Since 2017, the AAPA has been actively promoting Optimal Team Practice (OTP) — a framework that eliminates mandatory supervisory agreements and allows PAs to practice to the full extent of their education, training, and experience without a legally mandated physician oversight relationship.

The core principle of OTP is straightforward: PAs should be able to collaborate with physicians and other healthcare professionals as part of a team, but without the legal requirement of a formal supervisory agreement. This is a fundamental shift from the traditional PA practice model.

States Moving Toward OTP

Several states have adopted or are moving toward OTP-aligned legislation:

• South Dakota — eliminated mandatory collaboration after 6,000 practice hours
• Oklahoma — removed specific physician supervision requirements in favor of a collaborative framework
• Utah — allows PAs to practice with a practice agreement rather than a traditional supervisory agreement
• Wyoming — adopted OTP-style legislation removing physician supervision mandates
• North Dakota — moved to a collaborative agreement model

The trend is accelerating. More states introduce OTP-related bills each legislative session, and the momentum is clearly in the direction of greater PA autonomy.

The Liability Trade-Off

OTP gives PAs more clinical autonomy. It also gives them more individual liability exposure. Here is the trade-off:

The practical implication for insurance is clear: PAs in OTP states need stronger individual coverage. Without a supervising physician sharing liability, the PA stands alone as the primary defendant in malpractice claims. There is no physician’s policy to provide a secondary layer of coverage. The PA’s individual policy is the first — and possibly only — line of defense.