MEDICAL MALPRACTICE | 2026-09-29

Suing the Hospital for an ER Doctor’s Negligence: Ostensible Agency in California

Hospitals often argue that the doctors who treated you were “independent contractors,” not employees — so the hospital isn’t responsible. California’s ostensible agency doctrine frequently defeats that defense.

When a patient is harmed by negligent care in a hospital — especially in the emergency room — the hospital frequently responds that the treating physician was an <strong>independent contractor</strong>, not a hospital employee, so the hospital cannot be held responsible for the doctor’s malpractice.

Hospitals routinely staff their emergency rooms and specialty services with physicians who are technically independent contractors. When one of those doctors is negligent, the hospital’s first move is often to disclaim responsibility. California’s ostensible agency doctrine addresses exactly that situation.

The “Independent Contractor” Defense

As a general rule, a principal is not vicariously liable for the negligence of an independent contractor. Hospitals rely on this rule by contracting with physician groups — for emergency medicine, radiology, anesthesiology, and other services — rather than employing the doctors directly. When a patient sues over malpractice, the hospital argues that the negligent doctor was an independent contractor for whom it is not responsible. California recognizes an important exception that frequently defeats this defense in the hospital setting.

Ostensible (Apparent) Agency

Under the doctrine of ostensible agency (also called apparent agency or agency by estoppel), a hospital can be held vicariously liable for the negligence of a physician who was not its employee if the patient reasonably believed the physician was an agent of the hospital, and that belief was generated by the hospital’s conduct. The rationale is that a patient who goes to a hospital — especially an emergency room — generally seeks care from the hospital, not from a specific doctor they chose, and the hospital holds itself out as providing the care.

The Mejia v. Community Hospital Framework

California’s leading case, Mejia v. Community Hospital of San Bernardino, made clear that ostensible agency is readily established in the hospital context. The court explained that the elements generally reduce to two practical showings:

  • the hospital, by its conduct, held itself out as a provider of care (for example, by operating an emergency room and presenting physicians as part of its services), such that the patient reasonably believed the treating physician was the hospital’s agent; and
  • the patient relied on that appearance in seeking or accepting the care — reliance that is generally presumed when a patient seeks treatment at a hospital without independently selecting the physician.

Under Mejia, unless the hospital gave the patient meaningful, effective notice that the treating physician was an independent contractor (and the patient had a genuine opportunity to act on it), ostensible agency will usually be found. In practice, this means most patients treated by ER and hospital-based physicians can reach the hospital.

The Notice/Disclaimer Question

Hospitals sometimes point to admission-form disclaimers stating that physicians are independent contractors. California courts treat these skeptically: a boilerplate disclaimer buried in admission paperwork, signed by a patient in distress (often during an emergency), typically does not defeat ostensible agency, because it does not give the patient effective notice or a real choice. Whether a disclaimer was conspicuous and meaningful enough to change the patient’s reasonable belief is a fact question — and one hospitals usually lose in the emergency context.

Why It Matters

The hospital is frequently the more substantial defendant — with greater insurance and resources — than an individual physician or a small physician group. Establishing ostensible agency lets an injured patient hold the hospital responsible for the negligence that occurred within its walls, rather than being limited to pursuing the individual doctor. It also affects the practical value of the case and the ability to fully compensate a seriously injured patient.

Frequently Asked Questions

Can I sue a hospital for a doctor’s malpractice in California?

Often yes — even if the doctor was an independent contractor — under ostensible agency, if you reasonably believed the physician was the hospital’s agent based on the hospital’s conduct.

What is ostensible agency?

A doctrine holding a hospital vicariously liable for a non-employee physician’s negligence when the patient reasonably believed, based on the hospital’s conduct, that the doctor was its agent.

Does an admission-form disclaimer defeat it?

Usually not — California courts generally find boilerplate independent-contractor disclaimers in admission paperwork insufficient to give effective notice, especially in emergencies.

Why does the hospital matter if I can sue the doctor?

The hospital is often the more substantial defendant with greater resources and insurance, so reaching it can be essential to full recovery.

What is the key California case?

Mejia v. Community Hospital of San Bernardino, which established that ostensible agency is readily found in the hospital setting absent effective notice.

Does this apply outside the ER?

It commonly applies to hospital-based physicians (radiologists, anesthesiologists, ER doctors) the patient did not independently select; the analysis turns on the patient’s reasonable belief.

Related Personal Injury Guides

Talk to a California Medical Malpractice Attorney

If you were harmed by negligent hospital care, ostensible agency may let you hold the hospital responsible despite an “independent contractor” defense. Trembach Law Firm evaluates California hospital-liability claims. Call (818) 514-7680.

Contact Trembach Law Firm at (818) 514-7680 for a confidential consultation.

Trembach Law Firm | 27001 Agoura Road, Suite 350, Calabasas, CA 91301