Unio Specialty Care – Temple City
Board-certified gastroenterologists for digestive and liver conditions, colonoscopy and endoscopy. Care in English, Vietnamese, Mandarin, Spanish and Indonesian, minutes from Arcadia, Pasadena and San Gabriel.
4.9 from 2,226 patient reviews of our doctors
Board-certified gastroenterologists and a nurse practitioner, all at our Temple City office.
Ken D. Nguyen, MDGastroenterologistEnglish, Vietnamese
Meet Dr. Nguyen
Tim (Tien-Chun) Chen, MDGastroenterologistEnglish, Mandarin
Meet Dr. Chen
Dana Pan, MD, MHAGastroenterologistEnglish, Mandarin, Medical Spanish
Meet Dr. Pan
Lianna, MSN, FNP‑CFamily Nurse PractitionerEnglish, Indonesian, Medical Spanish
Meet Lianna
Thousands of patients have rated our doctors on Google, Rater8 and Healthgrades.
Dr Nguyen is friendly, knowledgeable & very skilled - this is the 2nd time I had an appt w/ him & he was great.
Dr Chen is an exceptionally kind, compassionate doctor. He is professional and communicates thoroughly with his patients. I highly recommend him for any gastrointestinal issues you may have.
Dr. Pan was thorough on explaining the procedure and the potential complications that could arise. The epitome of professionalism and being courteous to his patients.
Selected recent 5-star comments. Star scores include all ratings. Rater8 and Healthgrades update daily; Google loads live from Google.
Read all Google reviews: Temple City office · Dr. Nguyen · Dr. Chen · Dr. Pan
Unio Specialty Care – Temple City is a private gastroenterology and hepatology practice. Our doctors are specialty-trained to care for a broad range of digestive and liver diseases and perform many diagnostic and screening gastrointestinal (GI) procedures. We see patients in our office and in local San Gabriel Valley hospitals.
GI ConditionsWe treat digestive and liver problems including acid reflux, abdominal pain, diarrhea, constipation, IBS, hepatitis B and C, cirrhosis, hemorrhoids, celiac disease, Barrett's esophagus, and inflammatory bowel disease (Crohn's disease and ulcerative colitis).Learn more →
GI ProceduresUpper endoscopy, colonoscopy, small bowel enteroscopy, capsule endoscopy (NaviCam), high-resolution esophageal manometry, 24-hour pH testing, ERCP, hemorrhoid banding, liver elastography (FibroScan), and breath testing.Learn more →
Our GI doctors diagnose and treat digestive and liver conditions for patients from Temple City, Arcadia, San Gabriel, Pasadena, Monrovia, Monterey Park, Rosemead, and nearby cities. We are in-network with most PPO plans and Medicare, and care is available in English, Vietnamese, Mandarin, Spanish, and Indonesian.
Our doctors specialize in complex GI and liver diseases and are skilled in a wide range of GI procedures. We bring that knowledge and skill together to give our patients exceptional care.
We hold ourselves to high standards and deliver quality GI care that is cost-conscious for our patients and the healthcare system. Our physicians are registered with and report quality data to the GI Quality Improvement Consortium (GIQuIC).
Our physicians and staff give thoughtful, attentive care that considers your physical, mental, emotional, and financial health. We provide patient-centered care that treats you as a person, not just a patient.
Ken D. Nguyen, MD · Oct 25, 2026
Lactulose Breath Test for SIBO and Sugar Intolerance
A lactulose breath test checks for SIBO at home with the FoodMarble MedAIRE. The same device tests lactose, fructose, sorbitol, inulin, and sucrose intolerance.
Ken D. Nguyen, MD · Oct 24, 2026
Crohn's Disease: Symptoms, Treatment, and Clinical Trials
Crohn's disease can affect any part of the digestive tract. Learn the symptoms, how it's diagnosed, current treatments, and our clinical trials now enrolling.
Tim (Tien-Chun) Chen, MD · Oct 24, 2026
亞裔美國人的胃癌風險與篩檢
華人等亞裔族群罹患胃癌的風險較高。了解風險因素、幽門螺旋桿菌的影響、警訊症狀，以及何時應考慮胃鏡篩檢。Yes. We are in-network with most major PPO plans, including Aetna, Anthem Blue Cross, Blue Shield of California, Cigna, United Healthcare, and Medicare, plus many local IPAs and medical groups. See our accepted insurances for the full list.
PPO plans usually let you see a specialist without a referral, but check your plan's rules. HMO plans and IPAs generally need a referral from your primary care doctor.
Yes. Dr. Ken D. Nguyen speaks Vietnamese, and Dr. Tim (Tien-Chun) Chen and Dr. Dana Pan speak Mandarin. Dr. Pan also speaks Medical Spanish. Our nurse practitioner, Lianna, FNP-C, speaks Indonesian and Medical Spanish. Our procedure instructions are available in English, Spanish, Vietnamese, and Chinese.
Our office is at 6271 Rosemead Blvd, Temple City, CA 91780, at the southwest corner of Longden Ave and Rosemead Blvd, with free on-site parking. We serve patients from Arcadia, San Gabriel, Pasadena, Monrovia, Monterey Park, Rosemead, El Monte, and nearby cities. Procedures are performed at Valley Digestive Health Center and USC Arcadia Hospital in Arcadia.
Many healthy adults can. Our direct access colonoscopy program lets eligible patients skip the pre-procedure office visit.
Yes. We perform liver elastography in our Temple City office to check for liver fat and scarring in fatty liver disease, hepatitis B, hepatitis C, and other liver conditions.
Monday to Friday, 8:30 am to 5:00 pm. Call 626-898-4560.