210 Portland Street Columbia, MO 65201
573-777-8818
573-777-8819

Meet our committed caregivers

Here at GI Associates, we strive to provide the highest quality of care possible. As such we have chosen to have only licensed Registered Nurses support our patients and our Doctors. Our front desk and administrative service professionals are all highly trained and specialized in their respective field as well.
Dr. Donald C. Gerhardt
Donald C. Gerhardt
M.D. / FACP / AGAF
Dr. Stephen Welsh
Stephen W. Welsh
M.D.
Dr. Michele Diaz-Arias
Michelle Diaz-Arias
M.D.
Dr. Peter Jay Cleavinger
Peter Jay Cleavinger
M.D. / Ph.D.
Dr. Nicolas Llorens
Nicolas Llorens
M.D.
Dr. Matthew G. Struttmann
Matthew G. Struttmann
M.D.
Dr. Kevin D. Halsey
Kevin D. Halsey
M.D.
Dr. Michael D. Williams
Michael D. Williams
M.D.
Jacob Pilger
Jacob Pilger
Administrator
Rita
Rita Lutz
Advanced Gerontological Nurse Practitioner

Our Core Values

We treat each patient as a unique individual.

01.
Listen & Learn
02.
Evaluate
03.
Diagnose & Treat