Rebekah C. Johnston PA-C My Medical Specialty: GastroenterologyRelated Departments: Digestive Health Female | Speaks: English Board Certification National Commission on Certification of Physician Assistants This Provider Practices at: Cotton O'Neil Garfield901 S.W. Garfield Ave.Topeka, KS 66606-1670(785) 354-9591Fax: (785) 354-0586View Google Map Suggest An Update Credential change? New location?Enter provider updates below.Close Your Email* Update DetailsPhoneThis field is for validation purposes and should be left unchanged. This iframe contains the logic required to handle Ajax powered Gravity Forms. Need an appointment? Log into MyChart Don't have MyChart? Sign up today.