• Our Mission:
    Gastroenterology Associates is dedicated to providing high quality, community-driven digestive health care and wellness planning, including diagnosis, evaluation and treatment of digestive disease.
  • Core Values:
    1. Kindness
    2. Knowledge Sharing
    3. Respect
    4. Commitment
    5. Collaboration

Welcome to Our Practice

Gastroenterology Associates welcomes you!

At GA, we provide best practice gastroenterology care to the southern Puget Sound region by focusing on our patient’s experience and continually striving to improve safety, quality, accessibility, efficiency and cost containment. Our Gastroenterology Board Certified physicians specialize in gastroenterology, hepatology and related endoscopy procedures.

Our Board-Certified Advanced Practice Providers – ARNPs, PA-Cs and CRNAs – work closely with our physicians to provide our patients with the compassionate and evidence-based care they deserve. At GA, our core values of knowledge sharing, respect, kindness, commitment and collaboration guide us daily in providing excellent patient care.

Lobby Sign



Black Lives Matter march

Practice News

Equality is important to GA.  In observance of the Black Lives Matter strike on Friday June 12, 2020, GA temporarily halted non-essential patient care allowing our staff and providers to participate in a 10-minute silent and peaceful Black Lives Matter march in the MMP parking lot.  ___________________________________

Related to the COVID-19 global pandemic and public health recommendations:

  • Until further notice at our facilities we are not allowing visitors, are requiring that all providers, staff, patients and essential support person(s) upon arrival complete a COVID-19 symptom check, use hand sanitizer and wear facial coverage while on GA premises.  We have also installed plexiglass barriers at our lobby desks for better protection of patients and staff.

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We are very excited to announce that in mid-September we will move into a brand new two-story 26,000 square foot building, built specifically for GA to expand our office, Infusion Center and Endoscopy Center. Our new building is on Lilly Road NE near Providence St. Peter Hospital, just a few blocks south (closer to Martin Way) of our current location. We’ll keep you informed as we get closer to our big move!

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Gastroenterology Associates is no longer part of Washington Gastroenterology. Please contact us for medical records requests at 360-413-8250. If you have a billing question or payment for a service date of  1-1-18 through 12-31-19, please contact Washington Gastroenterology Billing Customer Service at 1-800-734-6855. For any service date before 1-1-18 or after 12-31-19, or if you’re not sure who to contact, give us a call at 360-413-8250.  We can help and look forward to hearing from you!

Physicians

  • Harpreet S. Brar, MD

    Dr. Brar began his GI career here in Olympia in 1999. He is well-known around the practice for his continual monitoring of all things newsworthy. This love of staying informed translates into Dr. Brar’s practice of medicine as he utilizes and shares the latest recommendations in evidence-based medicine with his patients, staff and peers.

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  • Mark D. Cumings, MD

    Dr. Cumings is a retired United States Army Colonel and was Gastroenterology Services Chief at Madigan Army Medical Center before retiring from military service and joining our practice in 2015. His GI career began in 2002 and has taken him all over the world. Dr. Cumings enjoys spending much of his time off boating, fishing and shrimping on local waters.

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  • Rodney W. Joe, MD

    Dr. Joe’s GI career started here in Olympia in 1997. He recently completed an MS in Healthcare Administration from University of Washington to expand his knowledge in healthcare management. Dr. Joe is well known for his easy-going style, including no neck ties from Memorial Day to Labor Day. He also facilitated a collaboration between GA and Harley-Davidson for a very popular “check your tailpipe” Colon Cancer Awareness month campaign.

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  • Lucas R. Leonard, MD

    Dr. Leonard began his GI practice in Fort Campbell, Kentucky, in 2014 and transferred to Madigan Army Medical Center in 2017, beginning weekend work with GA at the same time. Dr. Leonard retired from military service in December 2019 and we are thrilled to have him onboard at GA full time.

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  • Benjamin F. Merrifield, MD

    Dr. Merrifield began his GI career with GA in Olympia in 2005. Now he provides hospital coverage for GA a portion of each month. He also is a medical device inventor and is typically juggling several entrepreneurial projects at once.

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  • David J. Owens, MD

    Dr. Owens started his GI career in his hometown, Olympia, in 2009 after completing an additional year of GI fellowship to specialize in advanced GI technologies. Since then he has provided specialized advanced procedure services, such as Endoscopic Ultrasound, to our community.

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  • Bruce A. Silverman, MD

    Dr. Silverman completed his medical degree after earning an MS in Human Nutrition from Columbia University. His interest in nutrition has developed into a distinct interest in and avid investigation of the research being done on the human microbiome and he speaks frequently on this topic. Dr. Silverman’s GI career began in Olympia in 1988.

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  • Kathryne A. Wagner, MD

    Dr. Wagner began her GI career in Olympia in 1992 after returning to her PNW home from Syracuse, New York. Dr. Wagner believes in a maintaining a green, healthy and active lifestyle. She can frequently be found enjoying raw vegetables and has successfully completed the Seattle-to-Portland bike ride in one day!

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  • Nicholas K. Weber, MD

    Dr. Weber began his GI career in the south Puget Sound region in 2014, joining GA in 2017. He fits right in to the GA team with his intense focus on providing the highest quality, compassionate care to his patients.

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  • Meimin Xie, MD

    Dr. Xie (pronounced “see ya”) completed her medical degree after earning an MS in Molecular Biology from Iowa State University. She began her GI career here in Olympia in 2007. Dr. Xie is an active bicyclist and reminds us to share the road!

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  • Kristine Y. Zhang, MD

    Dr. Zhang left her Midwest roots to start her GI career here in Olympia in 2008. She, along with many of our physicians, balances a busy family life with her calling to be a physician.

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Advanced Practice Clinicians

  • Stephanie F. Mitchell, ARNP
    • Board Certified by the American Academy of Nurse Practitioners (AANP)
    • Education: Regis College, Master of Science degree in Nursing (MSN), Family Nurse Practitioner, following a Bachelor of Arts degree in History from the University of Portland
  • Victoria M. Moore, PA-C
    • Board Certified by the National Commission on Certification of Physician Assistants (NCCPA)
    • Education: University of Washington MEDEX Northwest Physician Assistant Program following a Bachelor of Science degree in Clinical Science from San Francisco State University
  • Stephanie A. Romine, ARNP
    • Board Certified by the American Academy of Nurse Practitioners (AANP)
    • Education: Seattle University, Master of Science Degree in Nursing (MSN), Adult-Gerontology Nurse Practitioner
  • Kimberly J. Thomas, ARNP
    • Board Certified by the American Academy of Nurse Practitioners (AANP)
    • Education: University of New Hampshire, Master of Science in Nursing (MSN), Family Nurse Practitioner
  • Janelisa K. Williams, PA-C
    • Board Certified by the National Commission on Certification of Physician Assistants (NCCPA)
    • Education: University of Washington MEDEX NW Physician Assistant Program following a Bachelor of Science degree in Microbiology from the University of Washington

Our Location

Find us on the map

Hours of Operation

Our Regular Schedule

Map and Location

Monday:

7:30 am-5:00 pm

Tuesday:

7:30 am-5:00 pm

Wednesday:

7:30 am-5:00 pm

Thursday:

7:30 am-5:00 pm

Friday:

7:30 am-5:00 pm

Saturday:

Closed

Sunday:

Closed

GA Endoscopy Center

Hours of Operation

Our Regular Schedule

Map and Location

Monday:

6:45 am-5:15 pm

Tuesday:

6:45 am-5:15 pm

Wednesday:

6:45 am-5:15 pm

Thursday:

6:45 am-5:15 pm

Friday:

6:45 am-5:15 pm

Saturday:

Closed

Sunday:

Closed

Providence St. Peter Hospital Endoscopy Center