Internal Medicine Providers
Our highly experienced team of providers is focused on keeping you at your healthiest best
Ching Wang, MD, FACP
Location: Yuma Internal Medicine Clinic
Specialty: Internal Medicine
Med School: University Federal de Rio de Janeiro, Rio de Janeiro, Brazil, graduated December 1989
Residency: New York Methodist Hospital in Brooklyn, NY, completed training June 1995
Certification: Board certified with the American Board of Internal Medicine, 1996, re-certified in 2016
Mazhar Bajwa, FNP-BC
Location: Yuma Internal Medicine Clinic
Specialty: Family Nurse Practitioner
School: Mountain State University, Beckley, WV, graduated December 2012.
Certification: Board certified with the American Nurses Credentialing Center, 2015
Joined Sunset September 2018
Delia Montopoli, CNM, MSN, OGNP-C
Location: Yuma Internal Medicine Clinic
Specialty: Certified Nurse Midwife / Health Nurse Practitioner
School: University of Chile School of Medicine, Santiago, Chile, completed training 1976 University of Wyoming School of Nursing, Laramie, WY, completed Master degree 1995
Certification: Board certified with American Midwifery Certification Board, 1995 Board certified with the National Certification Corporation for the Obstetric, Gynecologic and Neonatal Nursing Specialties. Master Degree in Nursing Education, 1993
Joined Sunset March 1996
Specialty: Certified Nurse Midwife / Health Nurse Practitioner
School: University of Chile School of Medicine, Santiago, Chile, completed training 1976 University of Wyoming School of Nursing, Laramie, WY, completed Master degree 1995
Certification: Board certified with American Midwifery Certification Board, 1995 Board certified with the National Certification Corporation for the Obstetric, Gynecologic and Neonatal Nursing Specialties. Master Degree in Nursing Education, 1993
Joined Sunset March 1996
Maju Lim, FNP-C
Location: North Yuma Internal Medicine Clinic
Specialty: Family Nurse Practitioner
School: Northern Arizona University, Flagstaff, AZ, graduated May 2023.
Certification: Board certified with the American Academy of Nurse Practitioners, 2023
Joined Sunset January 2024
Certification: Board certified with the American Academy of Nurse Practitioners, 2023
Joined Sunset January 2024
Bryson Wandling, PA-C
Location: San Luis Internal Medicine Clinic
Specialty: Physician Assistant
Med School: Harding University, Searcy, AR, graduated December 2018
Certification: Board certified with the National Commission on Certification of Physician Assistants, 2019
Joined Sunset May 2020
Specialty: Physician Assistant
Med School: Harding University, Searcy, AR, graduated December 2018
Certification: Board certified with the National Commission on Certification of Physician Assistants, 2019
Joined Sunset May 2020
Francisco Ordaz-Chavez, MD
Location: Yuma Internal Medicine Clinic
Specialty: Family Medicine
School: Universidad Michoacana de San Nicolas de Hidalgo, Michoacan, Mexico, graduated 2007
Certification: Board Certified with the American Board of Family Medicine, 2020
Joined Sunset December 2025
Hannah P. Loo, PA-C
Location: San Luis Internal Medicine Clinic
Specialty: Physician Assistant
School: A.T. Still University, Meza, AZ, graduated September 2025.
Certification: Board certified with the National Commission on Certification of Physician Assistants, 2025.
Joined Sunset January 2026