Miss. Code Ann. § 11-1-71

(1) Any licensed physician, certified nurse practitioner, psychologist or physician assistant who voluntarily provides needed medical or health services to any program at an accredited school in the state without the expectation of payment shall be immune from liability for any civil action arising out of the provision of such medical or health services provided in good faith on a charitable basis. This section shall not extend immunity to willful acts or gross negligence. Except in cases of rendering emergency care wherein the provisions of Section 73-25-37, Mississippi Code of 1972 , apply, immunity under this section shall be extended only if the physician, certified nurse practitioner, psychologist or physician assistant and patient execute a written waiver in advance of the rendering of such medical services specifying that such services are provided without the expectation of payment and that the licensed physician or certified nurse practitioner, psychologist or physician assistant shall be immune as provided herein.

(2) Any physician who voluntarily renders any medical service under a special volunteer medical license authorized under Section 73-25-18 without any payment or compensation or the expectation or promise of any payment or compensation shall be immune from liability for any civil action arising out of any act or omission resulting from the rendering of the medical service unless the act or omission was the result of the physician's gross negligence or willful misconduct. In order for the immunity under this subsection to apply, there must be a written or oral agreement for the physician to provide a voluntary noncompensated medical service before the rendering of the service by the physician.