Patient Care

The Division of Endocrinology, Diabetes and Metabolism provides comprehensive general treatment for adults of all ages for health issues related to the endocrine system, diabetes and other metabolic conditions.

Our physicians are known as endocrinologists. Our primary focus is on diabetes, diabetes prevention, and related metabolic syndrome abnormalities such as lipid disorders and high blood pressure. We also treat other disorders of the endocrine system, such as thyroid disease, osteoporosis, pituitary dysfunction, adrenal disorders, sexual dysfunction, hirsutism, polycystic ovarian syndrome, and calcium disorders. Our newest initiative, the Treatment, Research and Education of Adipose Tissue (TREAT) Program is related to adipose tissue disorders, involving fatty tissue abnormalities that may be metabolic in nature, but differ from common obesity in that they appear to be less responsive to diet and exercise.

We offer comprehensive care and preventative health programs that include advice on nutrition, diet and exercise regimens as well as alternative therapies and surgical remedies when recommended.

Diabetes & Family Medicine

Our primary clinical facilities are hosted by Banner – University Medical Center (UMC) Tucson and South campuses. Banner – UMC South is the home of our endocrinology as well as diabetes patient services. On this hospital campus, the Banner – University Medicine Endocrinology and Diabetes Clinic and the Diabetes Prevention & Education Center (DPEC) are located in the Abram’s Public Health Center, 3950 S. Country Club Road, Tucson, AZ 85714.

Here, patients and members of the community are offered medical care as well as self-management support. We provide a variety of educational sessions in our demonstration kitchen, a classroom and fitness assessment facility. Our complementary programs – from diabetes support groups to classes about healthy food choices and cooking demonstrations – are offered daily and provided in both English and Spanish.

For our latest DPEC calendar of free workshops and wellness events,  click here for a printable PDF in English and Spanish. (Hágase clic aquí para descargar un calendario imprimible de eventos en español.) You can also visit Banner – UMC’s online Events Calendar — in the “Select a Category” drop-down menu, click on “Diabetes”. (Ver nuestros talleres en el Calendario de Eventos en línea por el Internet. Seleccione la palabra “Diabetes” en el menú desplegable de categorías y haga clic en el botón de búsqueda — “SEARCH”. También, puede hacer clic en la imagen a la izquierda.)

Diabetes Prevention Program

Through Banner – UMC, a new free program is now offered for those who have been diagnosed with pre-diabetes. It offers weekly sessions available free of charge to learn more about losing weight, eating healthy and increasing your physical activity. This is achieved by taking small steps toward your goals. Stay motivated via group sessions. Learn more about it through  this flyer [PDF] or call (520) 626-1609 for additional information.


Where We Practice

To make appointments and leave messages for providers:

  • For Banner – UMC Tucson & South Clinic appointments, call: (520) 694-8888
  • For Banner – UMC Sierra Vista Clinic appointments, call: (520) 458-2000

The Banner – UMC South Campus Adult Endocrinology Clinics
Diabetes & Family Medicine Physician Offices
Abrams Public Health Center
3950 S. Country Club Road, Suite 140
Tucson, AZ 85714

Nurse Manager: Nikki Cocharo-Lutes, RN
Practice Supervisor: Annette Taylor
Practice Manager: Gina Baker

Phone: (520) 694-8888
Fax: (520) 874-2251
Hours: M - F, 8 - 11:30 a.m. (Physician's weekly days vary)
Scheduling: (520) 694-8888


  • Laila Abu Zaid, MD
  • Zeina Ali,  MD
  • Leopoldo Cobos, MD
  • Juan Galvez, MD
  • Gisell Gonzalez Rios, MD
  • Karen Herbst, MD, PhD
  • David Johnson, MD
  • Zubair Mirza, MD
  • Merri Pendergrass, MD, PhD
  • Dinkar Rupakula, MD
  • Craig Stump, MD, PhD
  • Charisse Te, MD

The Banner – UMC North Campus Adult Endocrinology Clinics
Adult Health Physician Offices,
3838 N. Campbell Ave. Bldg. #2
Tucson , AZ 85719

Nurse Manager: Paulette Miller, RN

Phone: (520) 694-8888
Fax: (520) 874-7042
Scheduling: (520) 694-8888
Hours: Wednesday, 8 a.m. - 4 p.m.

Provider: David Johnson, MD

Banner – UMC North Campus Lipedema/Lymphedema Clinic
Adult Health Physician Offices, 
3838 N. Campbell Ave. Bldg. #2
Tucson, AZ 85719

Nurse Manager: Paulette Miller, RN

Phone: (520) 694-8888
Fax: (520) 874-7042
Scheduling: (520) 694-8888
Hours: Monday, 8 a.m. - 4 p.m.

Provider: Karen Herbst, MD, PhD

Learn more about Lipedema/Lymphedema

Banner – UMC Clinics at Sierra Vista
3533 Canyon De Flores, Suite C
Sierra Vista, AZ 85650

Practice Supervisor: Malena Casillas-Quijada
Practice Manager: Brooke Hourscht

Phone: (520) 458-2000
Fax: (520) 458-1091

  • Tuesday, 8:40 a.m. - 3 p.m.
  • Thursday: 8:40 a.m. - 3 p.m.

Provider: David Johnson, MD

Southern Arizona VA Health Center
3601 S. 6th Ave., Tucson, AZ 85723
(520) 792-1450


  • Steve Thomson, MD, Assistant Professor of Medicine (Endocrinology), UA Department of Medicine
  • Ronnie William, MD, Assistant Professor of Medicine (Endocrinology), UA Department of Medicine

Learn more about our diabetes research study

How to Schedule an Appointment

In addition to the above information, you can also request an appointment online here. Or, if you already are a patient with us, you can log-in to the MyBanner Patient Portal to schedule or request an appointment. Questions? Call (520) 694-8888 or, if your question relates to our clinic in Sierra Vista, Ariz., call (520) 458-2000.

Learn more at Banner – University Medical Center

How to Make a Referral

If you’re a health-care provider and want to make a patient referral with one of our physicians, please contact Physician Resources at (520) 694-5868 or toll-free 1-800-524-5928. You can also visit the Information for Physicians webpage and click on "Physician Referral."

Learn more at Banner – University Medical Center