Within the limits of the human service zone appropriation, the human service zone promptly shall provide necessary medical services, covered in the written eligibility standards for general assistance, for any poor person in the human service zone who is not provided for in a public institution. The human service zone shall cause to be furnished to the person the necessary covered medicines prescribed by a physician. Necessary covered hospitalization must be furnished by the human service zone upon approval or subsequent ratification by the human service zone director or the director’s designee. If the poor person is a nonresident of the state, the human service zone furnishing the medical services must be reimbursed within the limits of funds appropriated for that purpose by the legislative assembly for eighty percent of the expenses incurred in carrying out this section. The reimbursement must be made upon vouchers having the approval of the department of health and human services.