Contact Us
We’re Here to Help
Whether you’re scheduling your first appointment, have questions about a procedure, or need assistance with your care, our team is here to help. We look forward to welcoming you to our Rancho Cucamonga office.
Office Information
To schedule an appointment, please call our office during regular business hours. A member of our staff will contact you as soon as possible.
Office Hours
Monday – Friday
9:00 AM – 5:00 PM
Office Location
Our office is conveniently located in Rancho Cucamonga with easy access from the 10, 210, and 15 freeways.
Have Questions?
Our staff is happy to assist with:
- Scheduling appointments
- Insurance verification
- Procedure scheduling
- Prescription refill requests
- Medical records requests
- General office questions
Please bring your photo ID, insurance card, and any applicable referral or medical records to your appointment.
If you need to cancel or reschedule your visit, please contact our office as soon as possible so we can accommodate other patients.
If you are experiencing a medical emergency, call 911 or go to the nearest emergency department immediately.
For urgent medical concerns outside normal office hours, please contact your primary care physician or seek appropriate emergency medical care.
We Look Forward to Meeting You
Thank you for considering Andrea Tieng, MD for your digestive health care. We are committed to providing compassionate, personalized gastroenterology care for adults throughout Rancho Cucamonga and the Inland Empire.
Ready to Schedule?
Request an appointment today.
Disclaimer: This information is for educational purposes only and is not medical advice. Always consult your physician regarding your individual health concerns.