M-9, r. 17 - Code of ethics of physicians

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94.1. A physician may not communicate information concerning a patient, or contained in the patient’s record, furnished by or concerning a third party, where knowledge of the existence or the communication thereof would make it possible to identify the third party and such disclosure could seriously harm the third party, unless the latter agrees in writing to the communication of the information or in the case of an emergency that threatens the life, health or safety of the person concerned.
The first paragraph does not apply where the information was furnished by a health or social services professional or by an employee of a health institution in the performance of their duties. For the purposes of this paragraph, trainees, including medical residents, are deemed to be health or social services professionals.
O.C. 1113-2014, s. 20.