Gary G. Graf APRN My Medical Specialty: Endocrinology male | Speaks: English Primary Phone: (785) 368-0440 Board Certification American Nurses Credentialing Center (Family NP) Education Nursing School Nursing Washburn University Topeka, KS 1992 This Provider Practices at: Cotton O’Neil Diabetes & Endocrinology Center 3520 S.W. 6th Ave. Topeka, KS 66606-2806 (785) 368-0445 Get Directions Suggest An Update Credential change? New location?Enter provider updates below.Close Your Email* Update DetailsCAPTCHANameThis field is for validation purposes and should be left unchanged. Need an appointment? Log into MyChart Don't have MyChart? Sign up today.