Dietitian consultations are necessary prior to bariatric surgery. Dietitian consults are available at Hays Medical Center. A consultation with the dietitian requires a physician's order. Your primary care physician can fax the physician's order to the dietitian regarding a pre-bariatric surgery consultation. The number for the dietitians at Hays Medical Center is fax 785.623.5529. After receiving the physician's order, one of the dietitians will call you to schedule an appointment time.