The State recognizes the confidential nature of the relationship between the health care provider and patient and if verification is required it shall be limited to the anticipated length of the absence, any restrictions upon return to work that prevent the employee from performing the full range of the employee's normal work assignment and anticipated future absences. If the department head or designee does not consider the verification adequate, the request for sick leave may be disapproved. Upon request, a denial of sick leave shall be in writing stating the reason for denial.