[4:55 PM] Michelle Dennison-Bunch


Dr. Carl Dettwiler

Dr. Carl Dettwiler

Dr. Dettwiler specializes in general Gastroenterology and Hepatology.  He has a special interest in preventing colon cancer.  He also encourages his patients to have adequate exercise and a healthy diet to reduce the risk of lifestyle related diseases. He is a member of the American Gastroenterology Association, Idaho Medical Association, American College of Gastroenterology, and American Society of Gastrointestinal Endoscopy.

Dr. Carl Dettwiler was born and raised in the northern part of Oregon’s Willamette Valley.  Family vacations introduced him to the Oregon Coast, Wallowa Mountains and traveling through Lewiston to visit Grandma in Arlee, Montana.  Memories of Lewiston include the Lewis-Clark murals on what was the old Safeway building.

Dr. Dettwiler graduated from Walla Walla College in1977 with a Bachelor of Arts degree.  He completed medical school in 1981 at Loma Linda University in Southern California.  He choose Kettering Medical Center/Wright State University in Dayton Ohio for his internal medicine residency.  Following his residency, Dr. Dettwiler continued with his gastroenterology fellowship at Kettering Medical Center which he completed in 1986. 

After completing medical school, residency, and fellowship, Dr. Dettwiler felt like he was coming home to the Northwest when he accepted a position to practice gastroenterology at Valley Medical Center in August of 1986.  He was pleased to find the history murals still on the Safeway building.

Dr. Dettwiler joined the active medical staff at both Tri-State Memorial Hospital in Clarkston and St. Joseph Regional Medical Center in Lewiston in 1986.  He has served on several medical staff committees at both hospitals.  Dr. Dettwiler served on the board of directors at Valley Medical Center for many years.  In 2005, he joined Dr. Michael Parent and Dr. Murray Larsen to start Lewis Clark Gastroenterology.  In 2013, after careful consideration of the options, Dr. Dettwiler chose to preserve independent, physician-owned practice of Gastroenterology as this deemed better for the community.

Dr. Dettwiler’s wife Medgy home-schooled their four children, including twin daughters, Liesel and Heidi, and sons, Peter and Hans, who are all now grown.  Dr. Dettwiler enjoys camping and backpacking in the Wallowa Mountains and rafting down the local rivers.

Amy Puhl, FNP-C

Amy Puhl, FNP-C

Amy Puhl, FNP-C joined Clearwater Gastroenterology in November of 2021. Amy has over five years’ experience in gastroenterology obtained while working in the endoscopy suite at Tristate Memorial Hospital.

Amy Puhl received her bachelor’s degree in Nursing from Lewis-Clark State College in 2014 and obtained her master’s degree in Nursing for Family Nurse Practitioner at Northwest Nazarene University in 2020. Amy also has her certification from the American Academy of Nurse Practitioners.

After spending five years working at the endoscopy suite at Tri-State hospital, Amy developed a interest in Gastroenterology and decided to pursue this interest further. That’s when she came to Clearwater Gastroenterology.

When not working, Amy enjoys camping, fishing, and spending time with her husband and two children.

Accredited by the AAAHC for Surgical Centers


Gem State Endoscopy, the ambulatory surgery center where Dr. Dettwiler performs procedures, has been accredited by the Accreditation Association for Ambulatory Health Care (AAAHC). Accreditation distinguishes Gem State Endoscopy from many other outpatient facilities through its adherence to rigorous standards of care and safety. Status as an accredited organization means Gem State Endoscopy has met nationally recognized standards for the provision of quality health care set by AAAHC. provides a valuable survey experience founded on a peer-based, educational approach to onsite review. The AAAHC Certificate of Accreditation demonstrates an organization’s commitment to providing safe, high-quality services to its patients—every day of the 1,095-day accreditation cycle. AAAHC Accreditation and Certification Programs are recognized by third-party payors, medical professional associations, liability insurance companies, state and federal agencies, and the public. For more information on AAAHC, please visit www.aaahc.org.

ASGE - EURP Accredited


The American Society for Gastrointestinal Endoscopy (ASGE), a leading gastrointestinal medical society, has granted a three-year renewal recognition for quality and safety to Gem State Endoscopy as part of its program specifically dedicated to promoting quality in endoscopy in all settings where it is practiced in the United States. Gem State Endoscopy is one of more than 600 endoscopy units to be granted the recognition since 2009, and the only one in Idaho and eastern Washington. The ASGE Endoscopy Unit Recognition Program honors endoscopy units that have demonstrated a commitment to patient safety and quality in endoscopy as evidenced by meeting the program’s rigorous criteria, which includes following the ASGE guidelines on privileging, quality assurance, endoscope reprocessing, CDC infection control guidelines and ensuring endoscopy staff competency.

To be recognized by ASGE, a unit, through a peer-reviewed application process, must attest to the continued competence of all staff relative to their roles, demonstrate the adoption of unit policies specific to ongoing assessment of performance relative to key quality indicators, and attest that the unit has an established infrastructure and personnel dedicated to infection control and prevention. The program is applicable to all settings where endoscopy is practiced, including office-based endoscopy units, hospital-based endoscopy units, and stand-alone ambulatory surgery centers.

Providers at Clearwater Gastro

Office Staff at Clearwater Gastroenterology


Clearwater Staff Jumping