
Overview
My area of interest is inflammatory bowel diseases (IBD) such as Crohn’s disease and ulcerative colitis. I also participate in clinical research to help evaluate new medications or products for use in IBD. These trials enable us to offer cutting-edge treatments for patients with Crohn’s and ulcerative colitis. I came to Duke as an intern almost 30 years ago and liked it so much I never left. I enjoy the relationships I have developed with my patients, some of whom I have treated for 15-20 years. I have watched many of them graduate from college, marry and have children of their own. I try to treat my patients as I would want a member of my family to be treated, and it is important to me that every patient understands that we are partners and need to work together as a team. When I am not at work, I enjoy going out to dinner or cooking with friends, working on my house, landscaping, and reading.
Dr. Onken is rated as an Experienced provider by MediFind in the treatment of Gastroesophageal Reflux Disease (GERD). Her top areas of expertise are Crohn's Disease, Ulcerative Colitis, Hemorrhagic Proctocolitis, Endoscopy, and Colonoscopy.
Her clinical research consists of co-authoring 20 peer reviewed articles. MediFind looks at clinical research from the past 15 years.
Insurance
Accepted insurance can change. Please verify directly with the provider.
Accepted insurance plans:
- EPO
- HMO
- POS
- PPO
- MEDICARE MAPD
- MEDICARE SNP
- OTHER MEDICARE
- OTHER MEDICARE PART D
- EPO
- HMO
- PPO
- EPO
- HMO
- POS
- PPO
- EPO
- HMO
- POS
- PPO
- HMO
- INSURANCE PLAN
- MANAGED MEDICAID PLAN
- MEDICARE MAPD
- MEDICARE PDP
- MEDICARE-MEDICAID PLAN
- OTHER COMMERCIAL
- OTHER MEDICARE
- OTHER MEDICARE PART D
- PPO
- INSURANCE PLAN
- MANAGED MEDICAID PLAN
- MEDICARE MAPD
- OTHER MEDICARE PART D
- PPO
- HMO
- POS
- PPO
- EPO
- HMO
- PPO
- MANAGED MEDICAID PLAN
- MEDICARE MAPD
- MEDICARE PDP
- MEDICARE SNP
- MEDICARE-MEDICAID PLAN
- HMO
- INSURANCE PLAN
- MANAGED MEDICAID PLAN
- MEDICARE MAPD
- MEDICARE PDP
- MEDICARE SNP
- OTHER COMMERCIAL
- OTHER MEDICARE
- OTHER MEDICARE PART D
- PPO
- EPO
- POS
- HMO
- INDEMNITY
- POS
- PPO
- EPO
- POS
- PPO
- OTHER MEDICAID
- STATE MEDICAID
- INSURANCE PLAN
- MANAGED MEDICAID PLAN
- MEDICARE MAPD
- MEDICARE PDP
- MEDICARE SNP
- MEDICARE-MEDICAID PLAN
- OTHER MEDICARE PART D
- HMO
- POS
- INSURANCE PLAN
- MEDICARE MAPD
- OTHER COMMERCIAL
- PPO
- INSURANCE PLAN
- MANAGED MEDICAID PLAN
- MEDICARE ASSISTANCE PROGRAM
- MEDICARE MAPD
- MEDICARE SNP
- OTHER COMMERCIAL
- OTHER MEDICARE
- OTHER MEDICARE PART D
- OTHER COMMERCIAL
- EPO
- HMO
- POS
- PPO
- EPO
- HMO
- INSURANCE PLAN
- MANAGED MEDICAID PLAN
- MEDICARE MAPD
- MEDICARE PDP
- MEDICARE SNP
- MEDICARE-MEDICAID PLAN
- OTHER MEDICARE
- OTHER MEDICARE PART D
Locations
40 Duke Medicine Cir, Durham, NC 27710
Clinical Research
Clinical research consists of overseeing clinical studies of patients undergoing new treatments and therapies, and publishing articles in peer reviewed medical journals. Providers who actively participate in clinical research are generally at the forefront of the fields and aware of the most up-to-date advances in treatments for their patients.
University Of North Carolina At Chapel Hill
Nicholas Shaheen is a Gastroenterologist in Chapel Hill, North Carolina. Dr. Shaheen is rated as an Elite provider by MediFind in the treatment of Gastroesophageal Reflux Disease (GERD). His top areas of expertise are Barrett Esophagus, Esophagitis, Gastroesophageal Reflux Disease (GERD), Endoscopy, and Tissue Biopsy. Dr. Shaheen is currently accepting new patients.
Duke Endoscopy Clinic - Clinic 2H
I have a clinical practice that focuses on the evaluation and management of patients with esophageal and swallowing disorders, including gastroesophageal reflux disease (GERD), eosinophilic esophagitis (EoE), Barrett’s esophagus and achalasia. Also, I have a strong academic and professional interest in health outcomes and quality of care. I am excited to be a part of Duke Health, where I can utilize revolutionary technologies like high resolution esophageal manometry and radiofrequency ablation to improve the care of my patients. Dr. Leiman is rated as a Distinguished provider by MediFind in the treatment of Gastroesophageal Reflux Disease (GERD). His top areas of expertise are Gastroesophageal Reflux Disease (GERD), Swallowing Difficulty, Esophagitis, Abdominal Wall Surgery, and Endoscopy.
University Of North Carolina At Chapel Hill
Evan Dellon is a Gastroenterologist in Chapel Hill, North Carolina. Dr. Dellon is rated as an Elite provider by MediFind in the treatment of Gastroesophageal Reflux Disease (GERD). His top areas of expertise are Eosinophilic Esophagitis, Esophagitis, Eosinophilic Enteropathy, Endoscopy, and Colonoscopy. Dr. Dellon is currently accepting new patients.
Areas of Expertise
MediFind evaluates expertise by pulling from factors such as number of articles a doctor has published in medical journals, participation in clinical trials, speaking at industry conferences, prescribing and referral patterns, and strength of connections with other experts in their field.
Learn more about MediFind’s expert tiers
- Distinguished
- Crohn's DiseaseDr. Onken isDistinguished. Learn about Crohn's Disease.
- Ulcerative ColitisDr. Onken isDistinguished. Learn about Ulcerative Colitis.
- Advanced
- Hemorrhagic ProctocolitisDr. Onken isAdvanced. Learn about Hemorrhagic Proctocolitis.
- Experienced
- AnemiaDr. Onken isExperienced. Learn about Anemia.
- Angiodysplasia of the ColonDr. Onken isExperienced. Learn about Angiodysplasia of the Colon.
- Celiac DiseaseDr. Onken isExperienced. Learn about Celiac Disease.
- Childhood VolvulusDr. Onken isExperienced. Learn about Childhood Volvulus.
- ColitisDr. Onken isExperienced. Learn about Colitis.
- Collagenous ColitisDr. Onken isExperienced. Learn about Collagenous Colitis.

