Colonoscopy only
No referral form and no office visit
For average-risk patients without GI symptoms who need a screening colonoscopy, polyp surveillance, or follow-up after colon cancer. Your patient completes a 5-minute online questionnaire, and we call them to schedule the colonoscopy.
Everything else
Send a referral, and our GI doctor sees your patient first
For patients with GI symptoms, liver disease, or abnormal tests or imaging, and for patients who need a colonoscopy but don’t qualify for direct access (for example, on a blood thinner, with a serious heart, lung or kidney condition, or on another HMO plan).
Direct access colonoscopy · No office visit needed
Patients without GI symptoms or major medical problems can go straight to colonoscopy, with no office consultation first. Most patients who need a colonoscopy qualify.
Open the Patient QuestionnaireYour patient completes it online in about 5 minutes.
Direct access is available for PPO, EPO and POS, Medicare, Optum, Regal/Lakeside and self-pay patients. Other HMO plans need a referral and an office visit first. Kaiser Permanente members: Direct Access colonoscopy is done at Valley Digestive Health Center, but it must be scheduled through Kaiser’s gastroenterology (GI) department.
Any of these? Please refer for an office consultation instead.
No referral needed: give your patient the questionnaire link or a printed handout, or open the questionnaire with them now. If they qualify, they can schedule online or ask our team to call them.
One page, with a QR code that opens the questionnaire in the patient’s language. Download, print, or send to your patients.
Questions about the program? Call 626-898-4560 · Fax 626-898-4561
Patient doesn’t qualify? Refer for an office consultation
Office consultation
For patients with GI symptoms or liver disease, or who don’t qualify for direct access. Our secure online form looks up your NPI to fill in your details, lets you attach records, and can email you a confirmation. We contact your patient to schedule.
Start a consultation referralPrefer fax or phone? See all the ways to refer.
Only need a colonoscopy for a patient without GI symptoms? Use direct access instead: no referral needed.
Submit securely from any device. Attach medical records (up to 10 files), and refer more patients without retyping your details.
Open the referral formDownload and fill out our printable referral form, then fax it to 626-898-4561 or email it to templecity@uniohp.com.
Open referral form (PDF)For urgent referrals, questions, or an inpatient consultation at a hospital where we have privileges, call us Monday–Friday, 8:30 am–5:00 pm.
Call 626.898.4560Please don’t use the online form or email for emergencies. We are always happy to discuss your patients: call 626.898.4560.
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.
Lianna is knowledgeable, accommodating and very friendly. She is very easy to talk to. She answered all the questions that I asked.
Friendly staff all around. Dr Lianna is always punctual, polite, & patient answering all my questions. Location is always clean. Highly recommend choosing this practice, it is an absolute gem.
In and out in no time. Front desk staff is friendly and welcoming. NP Lianna, kind thorough, got straight to the point.
Dr Nguyen is friendly, knowledgeable & very skilled - this is the 2nd time I had an appt w/ him & he was great.
Thank you Doctor Tien it was good too see you again 😁 many blessings to you 🕊️💙
Amazing doctors, timely, very helpful and comprehensive reports and procedures.
Selected recent 5-star comments. Star scores include all ratings and update daily.
Read all Google reviews: Temple City office · Dr. Nguyen · Dr. Chen · Dr. Pan
We aim to provide exceptional GI care and to be a valuable partner to local referring physicians and PCPs, with evidence-based, cost-efficient care for patients and the healthcare system as a whole.
After each visit or procedure, we fax the progress note, results, or procedure report to the referring physician, usually the same day.
Average-risk patients without GI symptoms or major medical problems can schedule a screening or surveillance colonoscopy online with no office consultation first. How it works.
Board-certified gastroenterologists experienced in complex GI and liver disease and advanced procedures, including ERCP, capsule endoscopy, esophageal manometry and FibroScan. We report quality data to GIQuIC.
Our providers speak English, Vietnamese, Mandarin, Spanish and Indonesian, and prep instructions come in English, Spanish, Vietnamese and Chinese.
In network with most PPO plans and Medicare, and we work with many local medical groups (IPAs), including Optum and Regal/Lakeside. Accepted insurance.
A Temple City office with free parking, procedures at Valley Digestive Health Center and USC Arcadia Hospital, and inpatient consultations at local hospitals where we have privileges.
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 →
Colonoscopy only, no GI symptoms: send your patient the direct access questionnaire. Everything else: refer for a consultation online, fax 626-898-4561, or call 626.898.4560.