Digestive Health Associates

Digestive Health Associates is a leading gastroenterology practice in Reno, Nevada, providing advanced level gastrointestinal healthcare and treatment for men and women throughout northern Nevada and eastern California. Our gastroenterologists are board-certified and dedicated to delivering the highest level of patients care.

Digestive Health Associates (DHA) leads Reno in offering the most advanced gastroenterology treatment and endoscopic procedures, as well as consulting and diagnosing a number of digestive disorders and GI conditions like acid reflux, irritable bowel syndrome, inflammatory bowel disease, hepatitis, obesity, and colon cancer.

Parking Directions – Digestive Health Associates is located at 655 Sierra Rose Drive in Reno, Nevada, just off Highway 395. The office building is located off the third driveway on Sierra Rose Drive. Parking is available around the entire perimeter of the building.

Gastroenterologists

Sam M. Nourani

M.S., M.D.

George Vagujhelyi

M.D.

Dennis Yamamoto

M.D.

Michael Gilles

M.D.

Erik De Jonghe

M.D., M.P.H.

William Pfau

M.D.

Ryan Sefcik

D.O.

Sumodh Kalathil

M. D.

Lynda Hoang

D.O., M.P.H.

Thinh Tang

D.O.

Adam Casey

Physician Assistant

Nurse Practitioners

Kristina A. Tennert

MSN, APRN, FNP-C

Samantha Potenciano

MSN, AGANP-BC

Sarah Farber

MSN, AGANP-BC

Frank Talon

APRN

Abigail Mitzel

MSN, APRN, FNP-BC

Christina Krainbrink

MSN, APRN, FNP-BC

Digestive Health Associates

Now Accepting New Patients

DHA Practice Administrator

Nelson Velasquez, Administrator

Nelson Velasquez

With nearly 20 years of experience in business management, Nelson Velasquez found his true calling in the medical sector early in his career. His journey led him from the corporate world to Digestive Health Associates, where he has passionately dedicated himself to creating a warm and welcoming environment for patients and staff alike. From day one, Nelson’s mission has been to ensure that every individual—whether provider, staff, or patient—feels valued and cared for, emphasizing that they are not just a number but a cherished part of the community.
 
Guided by his motto of “quality over quantity,” Nelson believes in the importance of fostering a supportive workplace that prioritizes work-life balance. He understands that a happy team translates to better care for patients, and he continually advocates for this principle within the practice.
 
Outside of work, Nelson is a devoted family man who spends much of his free time immersed in the world of soccer. An avid spectator of professional teams, his greatest joy comes from watching his son and daughter thrive in the sport. As a present husband and father to all his children, he cherishes the time spent together, embodying the values of love and support that he promotes in his professional life.
 
Nelson’s commitment to both his work and family reflects his belief that nurturing relationships—whether at home or in the practice—leads to a richer, more fulfilling life for everyone involved.
Healthcare Bluebook
CAP Accredited - College of American Pathologists
American Gastroenterological Associaton
CMS
GIQuIC
Colorectal Cancer Alliance
Colon Cancer Coalition