Jonathan P. Nienhouse, F.N.P. Jonathan P. Nienhouse, F.N.P. (303) 415-5199 Primary Specialties Urgent Care SHARE Primary Office Address Urgent Care Center - Gunbarrel 6685 Gunpark Drive East, Suite 102 Boulder, CO 80301 Get Directions Phone (303) 415-5199 Fax (303) 415-5198 About Physician Bio Jon Nienhouse is a Family Nurse Practitioner who has cared for patients in Family Practice and Urgent Care for the past 14 years. He has been a nurse for 23 years. He graduated from the University of Northern Colorado in 2002.