Provider Directory / F / Marissa Fahrbach CRNA Marissa Fahrbach, CRNA Anesthesia Specialties: Anesthesia Phone Number: 303-604-5000 Fax: 720-890-0364 Website Link: https://www.gastrorockies.com/ Address: Gastroenterology of the Rockies 1755 48th St Ste 100, Boulder, CO 80301 Get Directions