• CHPG Southwest - Gastroenterology

  • Centura Health Physician Group Southwest (CHPG) - Gastroenterology is a full service clinic that screens for, diagnoses, and treats a range of disorders of the esophagus, stomach, small and large intestine, biliary tract, liver, gallbladder, pancreas, colon, and rectum, including:

    Some procedures are performed in our physician clinic, and others may be performed at Mercy Regional Medical Center, which offers a range of diagnostic and therapeutic services.  

    Procedures and Treatments

  • Our Providers

  • Dr-LopezWeb.jpg

    Dr. Orlando Lopez-Roman is a fellowship-trained, board-certified gastroenterologist. Dr. Lopez graduated from University of Texas Southwestern Medical School, and completed fellowships in gastroenterology clinical nutrition at University of Chicago Hospitals and in gastroenterology at Veteran Affairs Caribbean HealthCare System in Puerto Rico.

    Dr. Todd Sheer

    Dr. Todd Sheer is a fellowship-trained, board-certified gastroenterologist and hepatologist. Dr. Sheer graduated from Georgetown University School of Medicine and completed his fellowship in gastroenterology and hepatology at the Naval Medical Center in San Diego. He previously served for 11 years as an officer with the U.S. Navy and Marine Corps.

    Dr. Nathan Voise

    Dr. Nathan Voise is a fellowship-trained, board-certified gastroenterologist who specializes in minimally invasive surgical techniques including endoscopic retrograde cholangiopancreatography (ERCP) and endoscopic ultrasound (EUS). Dr. Voise earned his doctor of osteopathic medicine degree from Oklahoma State University Center for Health Sciences, and completed his fellowship in gastroenterology at Oklahoma State University Medical Center in Tulsa.

  • Hours

    Monday through Friday, 8:00 a.m. - 4:30 p.m.

    Contact Information

    Appointments: (970) 764-3800


    Mercy Medical Plaza, Suite 270, on the Mercy Regional Medical Center Campus 
    1010 Three Springs Blvd., 
    Durango, CO 81301
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