Rio Grande Internal Medicine, PC. Address. PO Box 10460. Albuquerque, NM 87184 phone: (505) 503-8829. fax: (505) 234-1707 Dear Patient: To begin, I would like to thank you for the trust you have given me over the years as your physician. Taking care of you has been an honor for my staff and me. Your continuing wellness and health have been a ....