Jennifer Kaufman ARNP PLLC & Larsen Gastroenterology PLLC Share: Medical and Dental Jennifer Kaufman ARNP PLLC & Larsen Gastroenterology PLLC Visit Website 625 6th Street Clarkston, WA 99403 (509) 758-2200 (509) 758-6511 (fax) Hours: Monday-Friday9a-5p; Evenings and Weekends by Appt About About Outpatient gastroenterology clinic