Missouri Revised Statutes Title XXVIII. Contracts and Contractual Relations § 431.062. Minor cannot disaffirm contract, when--parents or guardian not liable, exception--disclosure by physician authorized, when

(1) His consent shall not be subject to disaffirmance or revocation because of minority;

(2) The parent, parents, conservator, or relative caregiver shall not be liable for payment for such care unless the parent, parents, conservator, or relative caregiver has expressly agreed to pay for such care;

(3) A physician or surgeon may, with or without the consent of the minor patient, advise the parent, parents, conservator, or relative caregiver of the examination, treatment, hospitalization, medical and surgical care given or needed if the physician or surgeon has reason to know the whereabouts of the parent, parents, conservator, or relative caregiver. Such notification or disclosure shall not constitute libel or slander, a violation of the right of privacy or a violation of the rule of privileged communication. In the event that the minor is found not to be pregnant or not afflicted with a venereal disease or not suffering from drug or substance abuse, then no information with respect to any appointment, examination, test or other medical procedure shall be given to the parent, parents, conservator, relative caregiver, or any other person.