A worker can become another party's employee for a specific job.

The key question is control. Under the borrowed servant rule, an employee who is normally hired and paid by one person or company may be treated, for a limited task, as the servant of someone else who directs how that task is done. Courts look at who had the right to supervise the work, give instructions, and control the details at the time the mistake happened. In a medical setting, that often comes up when a hospital employee, such as a nurse or technician, is working under a surgeon's immediate direction during a procedure.

This rule matters because it can shift legal responsibility from one defendant to another. A claim may turn on whether the hospital is liable under respondeat superior, whether the doctor is personally responsible, or whether both may be named in the lawsuit. That can affect insurance coverage, settlement leverage, and how a case is investigated.

In New York medical malpractice cases, the borrowed servant rule often appears in disputes over operating-room conduct and staff supervision. It is not a special statute with its own deadline, but it can shape who gets sued before the statute of limitations runs under CPLR 214-a. In Brooklyn, those malpractice cases are generally filed in Kings County Supreme Court, where control and supervision are heavily fact-driven issues.