If the patient portal is unavailable, please phone our office and select option 2 from the greeting. ... Carla K. Hausrath, ANP-C . Contact Us 459 Margaret St. Plattsburgh, NY 12901 . Phone # 518-563-6348 Fax # 518-563-6378. Office Hours. Monday 8 am – 5 pm Tuesday 8 am – 8 pm.