Gastroenterologist in Tucson, AZ

Dr. Miguel A. Arenas is board certified in Gastroenterology and Internal Medicine. Please see below to learn more about his specialty, medical education, and professional affiliations.

Miguel A. Arenas, MD


Miguel A. Arenas, MD, Gastroenterologist

Dr. Arenas is the founding member of MGSC. He is native from Peru. Dr Arenas received his medical degree from the San Agustin National University in Arequipa, Peru. Graduating with honors, he went on to pursue his medical training in the United States. After medical school he completed his internship and residency in Internal Medicine at the THMEP-University of Arizona program. Wanting to further specialize, he then completed a fellowship in Gastroenterology at the University of Arizona in 2007. He is board certified in Internal Medicine and Gastroenterology. He is married to a Tucson native Katie Belk-Arenas and they have two children.  In his spare time, Dr Arenas enjoys playing the guitar and mandolin, fishing and other outdoor sports. He is active in community events and his son’s schools.

Dr. Arenas performs Endoscopic Ultrasounds (EUS) which allows him obtain images and information about the digestive tract and the surrounding tissue and organs, including the lungs.

Currently accepting new patients

Principal specialty: Gastroenterology
Secondary specialty: Internal Medicine
Residency: 2001-2004
Fellowship: 2007-2007
Academic appointmets: clinical instructor THMEP-UA program
Board certification: Internal medicine 2004, Gastroenterology 2008
In practice since 2007
American College of Gastroenterology
American Society of Gastrointestinal Endoscopy
American College of Physicians
American Medical Association
Honors Patient’s Choice Award 2008
Languages available: Spanish


Dejan Dukic, NP


Dejan Dukic, APNP, FNP-C, BSN

Dejan Dukic, APNP, FNP-C, BSN, comes to us from Oshkosh, Wisconsin. Dejan has 9 years of experience in nursing, with 4 of those years as a Nurse Practioner in Gastroenterology. Dejan is fluent in Serbian, Croatian, Bosnian and English.

Shelby Coplen, PA-C

Shelby Coplen, PA-C

Shelby Coplen, PA-C is a recent graduate of Butler University in Indianapolis, IN. She received her Bachelor of Science in Biology from Indiana University, graduated with High Distinction and was a Phi Beta Kappa Academic Honors Society Member. Shelby has had rotation experience in Obstetrics & Gynecology, Mental Health, Pediatrics, Dermatology, Emergency Medicine, Family Medicine, General Surgery, Internal Medicine and Gastroenterology. Shelby enjoys cooking, hiking and traveling.