Our Staff

Gastroenterologist in Tucson, AZ

Our staff is proud to serve the patient community and their families. We provide state-of-the-art evaluation and treatment services, and delivering quality patient care is the center of everything we do.

We a provide a convienent and safe enviroment to complete your gastrointestinal procedures in an outpatient setting. We are fully capable of providing sedation for your added comfort. Our sedation is provided for most procdeures, it is administered by our highly trained physicians, with the most current technology and medications available for safe and effective sedation.

Sam E. Moussa, MD, FACG, FASGE, Associate Clinical Professor of Medicine, University of Arizona, College of Medicine

Voted Best GI Doctors by Tucson Lifestyle Magazine


  • 1988-1990 Fellowship in Gastroenterology
    University of Arkansas for Medical Sciences
    Little Rock, Arkansas
  • 1987-1988 Fellowship in Hepatology
    Yale University/VAMC
    New Haven, Connecticut
  • 1984-1987 Internal Medicine Residency
    Georgetown University/VAMC
    Washington, DC
  • 1983-1984 Elective in GI, ID, ER, and General Medicine
    Georgetown University/VAMC
    Washington, DC


Board Certifications:

  • American Board of Internal Medicine 1987
  • American Board of Internal Medicine 1989

Douglas S. Peterson, MD

Douglas S. Peterson, MD

Voted Best GI Doctors by Tucson Lifestyle Magazine

  • Phillips Exeter Academy, Exeter, New Hampshire 1979-1980
  • Duke University, Durham, North Carolina 1980-1984
    Bachelors in Science – Zoology
  • University of Wisconsin Medical School 1985-1989
  • University of Arizona-Internship Internal Medicine
  • University of Arizona-Residency Internal Medicine 1990-1992
  • University of Arizona 1992-1993
    Internal Medicine-CHIEF RESIDENT
  • University of Arizona-Fellowship in Gastroenterology 1993-1995

Board Certifications:

  • American Board of Gastroenterology 2005

Bassel Kisso, MD


  • Aleppo University Medical School, Aleppo, Syria, 1994-2000
    MD Diploma
  • Aleppo University Hospital, Aleppo, Syria, 11/2000 – 11/2003
    Internal Medicine Residency
  • University of South Dakota, Sanford School of Medicine, Sioux Falls, SD, 07/2004 – 06/2007 
  • Internal Medicine Residency Program
  • University of Arizona, Tucson, AZ – 07/2012-06/2015
  • Gastroenterology Fellowship


  • Arizona Medical License

Board Certifications

  • American Board of Internal Medicine 2007
  • American Board of Gastroenterology 2015

We are pleased to introduce Dr. Prabhakar Swaroop who is joining us on June 11th

Prabhakar Swaroop, MD


Dr. Swaroop obtained his GI training at Harvard University Brigham and Women's Hospital in Boston. He completed his residency in Internal Medicine at Columbia University St Luke's Roosevelt Hospital Center in New York.

He became an Associate Professor of Internal Medicine at UT Southwestern Medical Center in Dallas. He was the Medical Director of Digestive, Liver Diseases and IBD Clinic.

He comes to Adobe with 10 + years’ experience and has more than 40 publications.