Darrin L. Cox PA-C My Medical Specialty: Internal Medicine/Pediatrics Male | Speaks: English Board Certification National Commission on Certification of Physician Assistants This Provider Practices at: Cotton O'Neil Oskaloosa209 W. JeffersonPO Box 307Oskaloosa, KS 66066-5359(785) 863-3417Fax: (785) 863-3478View Google Map Suggest An Update Credential change? New location?Enter provider updates below.Close Your Email* Update Details 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.