Primary Care

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Zhi Cheng, MD
Internal Medicine

Zhi Cheng, MD, is an assistant professor in the Kirk Kerkorian School of Medicine at UNLV Department of Internal Medicine. Having grown up in Texas, Dr. Cheng received his bachelor’s degree in business from the University of Texas at Austin, which he followed up with a medical degree from the University of Texas Medical Branch (UTMB) John Sealy School of Medicine. Afterwards, he came to Las Vegas, Nevada, to complete his internal medicine residency at Sunrise Health Graduate Medical Education (GME) Consortium.

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Leora Frimer, MD
Internal Medicine, Geriatrics

Leora Frimer, MD, is an assistant professor in the Kirk Kerkorian School of Medicine at UNLV Department of Internal Medicine. Originally from Canada, Dr. Frimer received her bachelor’s degree in psychology from McGill University. Additionally, she received her medical degree from St. George’s University and her master’s degree of public health from McGill University. After completing her residency in internal medicine at the University of Central Florida/HCA Florida Healthcare GME Consortium, Dr.

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Yonatan Ghiwot, MD
Internal Medicine

Yonatan Ghiwot, MD, is an assistant professor in the Kirk Kerkorian School of Medicine at UNLV Department of Internal Medicine. Dr. Ghiwot attended Texas A&M University where he earned a bachelor’s degree in biomedical sciences. He then completed his medical education at St. George’s University and followed up with his residency in internal medicine at Florida Atlantic University.

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Badrunnisa Hanif, MD
Internal Medicine

Photo: Dr. Hanif

Dr. Badrunnisa Hanif, MD, FACP, Board Certified in Internal Medicine since 2002 is an assistant professor in the Kirk Kerkorian School of Medicine at UNLV Department of Internal Medicine. She was graduated from Sindh Medical College in Karachi, in 1996, and completed her residency training in 2002 from the University of Nevada, Reno School of Medicine.

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Nazia Khan, MD
Internal Medicine

Photo: Nazia Khan, MD

Dr. Nazia Khan, an assistant professor in the Kirk Kerkorian School of Medicine at UNLV Department of Internal Medicine, received her medical degree at Dow Medical College in Pakistan.

Board certified in internal medicine by the American Board of Internal Medicine, she completed a residency at the University of Nevada Reno School of Medicine.

Her research includes work done at the LDS Hospital Cardiovascular Research Division in Salt Lake City, UT. 

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Eric McClintock, MD
Internal Medicine

Eric McClintock, MD, is an assistant professor in the Kirk Kerkorian School of Medicine at UNLV Department of Internal Medicine. Originally from Reno, Nevada, Dr. McClintock received his bachelor’s degree in science from the University of Nevada, Reno before attending the Kirk Kerkorian School of Medicine as a member of its charter class. After receiving his medical degree, he completed an internal medicine residency at the Kirk Kerkorian School of Medicine.

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Josue Portillo, DO
Internal Medicine

Josue Portillo, DO, is an assistant professor in the Kirk Kerkorian School of Medicine at UNLV Department of Internal Medicine. Originally from Las Vegas, NV, Dr. Portillo received his bachelor’s degree in cell and molecular biology from UNLV. Afterwards, he earned his medical degree from Rocky Vista University College of Osteopathic Medicine and completed his residency in emergency medicine at Loyola University Medical Center. Returning to his hometown, Dr. Portillo completed his critical care medicine fellowship at the Kirk Kerkorian School of Medicine.

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Shelby Schuh, DO
Internal Medicine

Shelby Schuh, DO, is an assistant professor in the Kirk Kerkorian School of Medicine at UNLV Department of Internal Medicine. Originally from Wisconsin, Dr. Schuh received her medical degree from Nova Southeastern University College of Osteopathic Medicine. Following this, she completed her internal medicine residency at the University of Missouri-Columbia.

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Aditi Singh, MD
Internal Medicine

Photo: Aditi Singh, MD

Dr. Aditi Singh, an associate professor in the Kirk Kerkorian School of Medicine at UNLV Department of Internal Medicine, is associate medical director of the internal medicine residency program. 

A graduate of the University of Nevada Reno School of Medicine, she cares for patients in the areas of preventative medicine, diabetes, hypertension management and women’s health. 

Director of ambulatory education in the internal medicine program, Dr. Singh is board certified by the American Board of Internal Medicine. 

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Misti Song, MD
Internal Medicine

Photo: Dr. Misti Song

Dr. Misti Song, an assistant professor in the Kirk Kerkorian School of Medicine at UNLV Department of Internal Medicine, received her medical degree from Loma Linda University. 

She is board certified in internal medicine by the American Board of Internal Medicine. 

(702) 671-5060 Office
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John Varras, MD
Internal Medicine, Diabetes and Weight Management

Photo: John Varras, MD

Dr. John Varras, is a professor at Kirk Kerkorian School of Medicine at UNLV Department of Internal Medicine. He attended medical school at Creighton University in Nebraska, where he also completed his residency. 

He is the former chair for the department of internal medicine at the University of Nevada Reno School of Medicine. Under his leadership, the department of internal medicine expanded the size of the residency training program and started three new fellowships in cardiology, gastroenterology, and pulmonary and critical care.

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Sandhya Wahi-Gururaj, MD
Internal Medicine

Photo: Sandhya Wahi-Gururaj, MD

Dr. Sandhya Wahi-Gururaj, an associate professor in the Kirk Kerkorian School of Medicine at UNLV Department of Internal Medicine, is a board-certified general internist and currently serves as the internal medicine residency program director. 

A member of the American College of Physicians, Dr. Wahi-Gururaj has helped to shape curricula and training programs for local fellows and residents while maintaining a clinical presence that centers on establishing long-lasting, communicative relationships with her primary care patients.

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Ji Won Yoo, MD, MS
Internal Medicine, Geriatrics

Photo: Ji Won Yoo, MD

Ji Won Yoo, MD, is the Nevada Interprofessional Healthy Aging Network Program Director and Assistant Professor in the Department of Internal Medicine at the Kirk Kerkorian School of Medicine at UNLV. Nevada is a very popular place to retire, especially, with the baby boomer generation. At the same time, the number of providers of medical care in Nevada has not kept pace with the overall population and specifically, not with the geriatric population.  For example, Nevada ranks 48th out of 50 states in primary care provider shortage. As we age, care often becomes more complex.

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