Provider Directory / N / Joseph Nissim M.D. Joseph Nissim, M.D. Internal Medicine Specialties: Internal Medicine Phone Number: 303-776-1532 Fax: 303-776-3109 Website Link: https://www.bch.org/Find-a-Physician/N/Joseph-J-Nissim-M-D-.aspx Address: Frontier Internal Medicine 2101 Ken Pratt Boulevard, Suite 104, Longmont, CO 80501 Get Directions