Provider Directory / K / Benjamin J Keidan M.D. Benjamin J Keidan, M.D. Internal Medicine Specialties: Internal Medicine Phone Number: 303-415-4259 Fax: 303-415-5249 Website Link: https://www.bch.org/Find-a-Physician/K/Benjamin-J-Keidan-M-D-.aspx Address: Internal Medicine Associates - Boulder 5495 Arapahoe Avenue, Suite 100, Boulder, CO 80303 Get Directions