Our Practice

W. Travis Dierenfeldt, M.D.

Dr. Dierenfeldt received his undergraduate and medical degree from the University of Missouri at Kansas City.  He completed a residency in Internal Medicine followed by a fellowship in Gastroenterology.  He is board certified in gastroenterology through the American Board of Internal Medicine and has performed over 30,000 endoscopic procedures.  He has been practicing medicine in Manhattan, Kansas since 2000.  He has a very active medical practice and is also the creator of Low FODMaP IBS Diet an online resource for people suffering from IBS.  He is also the founder and CEO of MD Nutraceutics, Inc., a nutritional supplement company that creates pharmaceutical grade probiotics that can be integrated with your traditional medical care.


W. Travis Dierenfeldt, MD

Robert J. Starnes, P.A.-C

Robert Starnes, a native of Manhattan, Kansas, completed his undergraduate work at Kansas State University and received his physician assistant degree from Wichita State University.  He is board certified through NCCPA and has advanced training in gastroenterology.  He has a special interest in liver disease, capsule endoscopy and inflammatory bowel disease.

Robert Starnes, PA-C

Callea Breiner, ARNP

Callea graduated from Fort Hays State University in 2009 with a Master’s of Science in Nursing as a Family Nurse Practitioner. She is board certified as a Family Nurse Practitioner with the American Association of Nurse Practitioners as well as the American Nurses Credentialing Center. Callea is an active member of the American Academy of Nurse Practitioners, Kansas Alliance of Nurse Practitioners, Association of PeriOperative Registered Nurses, as well as the Wound, Ostomy, and Continence Nurses Society. She is also a member of Sigma Theta Tau Nursing Honor Society.  Her experience includes orthopedics, general surgery, as well as a strong focus in ostomy care. Callea is a Certified Nurse of the Operating Room as well as a Certified Advanced Practice Ostomy Care Nurse. Currently, she is working on her Doctorate of Nursing Practice and will graduate in the first class at Fort Hays State University in May of 2018.

Callea Breiner, ARNP