Give Us A Call: 
(646) 355-3711

Midwestern University, 2013, Downers Grove, Illinois​

Hospital Affiliation
Beth Israel Medical Center - Petrie Division (New York, NY)
I take an integrative and holistic approach to gastrointestinal diseases and treat patients as a whole. I believe in incorporating lifestyle changes along with nutrition into my treatment plan.  I look forward to speaking with you soon.
Languages Spoken

Chinese (Cantonese, Mandarin)

Feel free to visit for more information regarding the Physician Assistant role.

What is a Physician Assistant?

Physician Assistant Training

Midwestern University, 2013, Downers Grove, Illinois

Use of Pharmacotherapy in Anorexia Nervosa Treatment
​Masters Presentation
​Awarded Honorable Mentions, June 2013


Clinical Gastroenterology and Hepatology - The presence of HLA-DQ8 does not correlate with severity of celiac disease: Comparison of New York and Parisian cohorts

American Journal of Gastroenterology - Prevalence of Celiac Disease in Patient with Hepatitis C Virus in Manhattan

American Journal of Gastroenterology - Prospective pilot study to determine the use of real-time video capsule endoscopy in risk stratification of patients that present with upper gastrointestinal bleeding

Gastroenterology - Correlation Between Lipid Profile and Outcome of Hepatitis C Treatment

​Gastroenterology - The Effectiveness of Pegylated-Interferon and Ribavirin Combination Therapy for Chronic Hepatitis C in an Urban Clinic Setting Compared to Pivotal Clinical Trials

American Journal of Gastroenterology - Trends in Biopsy and Treatment Rates in Patients with Chronic Genotype 2 & 3 Hepatitis C Infection Over a Six-Year Period

Columbia College of Physicians and Surgeons, New York, NY

Albert Einstein, Beth Israel Medical Center, Residency in Internal Medicine, and Fellowship in Gastroenterology

Hospital Affiliation

Beth Israel Medical Center - Petrie Division (New York, NY)

Residency Training

Albert Einstein College of Medicine of Yeshiva University

Beth Israel Medical Center, Residency in Family Medicine

Languages Spoken




Philadelphia College of Osteopathic Medicine, Philadelphia, Pennsylvania

St. Joseph's University Haub School of Business, Philadelphia, Pennsylvania

Timothy C Johnson, MD

Board Certified in Internal Medicine and Gastroenterology

Hello and thank you for taking the time to view our practice. I currently treat general gastrointestinal issues, including food allergies, irritable bowel conditions, acid reflux, and ulcer disease, as well as liver related diseases, inflammatory bowel disease, and perform colorectal cancer screenings. I accept same day and walk-in appointments. I also perform procedures on weekends to minimize time off from work for my patients.

​Lena Tung, RPA-C

​Board Certified Physician Assistant

I received my Bachelor of Science degree in English Language & Literature in 2011 at the University of Michigan in Ann Arbor, MI. In 2013, I earned a Masters of Medical Science in Physician Assistant Studies at Midwestern University in Downers Grove, Illinois.

My clinical experiences include a wide range of specialties such as family medicine, women's health, pediatrics, and emergency care. I am fluent in Chinese.


Our Providers

Yolanda Tun-Chiong, DO, MBA

Board Certified in Family Medicine

As a board certified family physician, I practice pediatrics, adolescent care, internal medicine and gynecology.  I offer same day appointments for the following services: vaccinations, annual physicals, gynecological exams, pap smears, STD screening, TB and lab testing, travel advice, osteopathic manipulation treatment, pre-employment and school forms, smoking cessation, and specialist referrals. I strive to provide high quality comprehensive holistic care to all my patients.