DepartmentsHospital Internal MedicineLocationPhoenix, ArizonaLanguagesEnglishExisting patientsSend a secure message via patient portal Procedures performedHospitalization InterestsHospital internal medicine Mayo Clinic locations Phoenix, Arizona Driving Directions More info Billing & insurance Accessibility services Education1988Resident - Internal MedicineLos Angeles County-University of Southern California Medical Center1986Internship - Internal MedicineLos Angeles County-University of Southern California Medical Center1985MDUniversity of Illinois College of Medicine1980BS - BiologyArizona State UniversityShow more education Activities and honorsCertifications2000Internal MedicineAmerican Board of Internal MedicinePublicationsSee my publications Procedures performedInterestsMayo Clinic locationsEducationActivities and honors Request an appointment PST-20222419 Doctors & Medical Staff Santiago, Michael J. M.D.