Section 13I. Notwithstanding any provisions of this chapter to the contrary, all costs and charges for patients who are residents of other countries shall, as provided herein, be exempted from the limitations imposed by this chapter. Any hospital shall be allowed to impose a surcharge on the normal charges that would otherwise be allowed for such residents of other countries. Such surcharges shall not be included in the calculation of gross patient service revenues. The normal charge and the patient discharge statistics shall otherwise be included under this chapter.