Article R6154-7 of the French Public Health Code
For any procedure or consultation, a patient who chooses to be treated as a self-employed practitioner is given, in advance, full details of the rules that will apply to him as a result of his choice. In the event of hospitalisation, they must expressly state in writing their choice to be treated as a private practitioner. The provisions of article R. 1112-23 are applicable in all public health establishments.