Family Medicine/Internal Medicine at Ontario Medical Center
Internal Medicine • Ontario, CA
Clinic Type
Internal Medicine
Address
Medical Office Building A, Hospital and Medical Offices, 2295 S Vineyard Ave, Ontario, CA 91761
Phone
1-833-574-2273 (Toll free)
directoryupdate@kp.org
Opening Hours
Monday through Friday, 8:30 a.m. to 5 p.m. (clinic hours); After-hours: Monday through Friday, 5 p.m. to 7 p.m., by appointment only
Services Offered
Insurance & Payment
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Languages Spoken
FAQs
We want to speak to you in the language that you’re most comfortable with when you call or visit us. Qualified interpreter services, including sign language, are available at no cost, 24 hours a day, 7 days a week during all hours of operations at all points of contact. We do not encourage the use of family, friends or minors as interpreters. Only the services of interpreters and qualified staff are used to provide language assistance.
Interpreter services are available at no cost, 24/7 during all hours of operations at all points of contact; in-person, telephone, video, and alternative modes of communication are available.
Medicare Members: To request a hard copy of Kaiser Permanente’s provider directory, please call our Member Services department at 1-800-443-0815, seven days a week, 8 a.m. to 8 p.m. Kaiser Permanente will mail a hard copy of the provider directory to you within three (3) business days of your request.
Call Member Services at 1-800-443-0815 for a hard copy of the provider directory (delivery within 3 business days).
Medi-Cal Members: This includes Kaiser Permanente’s outpatient pharmacies...
Information about Medi-Cal coverage and Medi-Cal Rx pharmacies; see details about Medi-Cal Rx and related pharmacy information.
If you have questions, please call us at 1-800-464-4000 (toll free). For the hearing and speech impaired: 1-800-464-4000 (toll free) or TTY 711
General inquiries line and TTY support available.
Social Media
Photos

What Patients Say
Overall sentiment across review platforms: mixed
- Birdeye (Aggregate): 3.6/5 stars (672 reviews)
- Yelp (Medical Center): 2.3/5 stars (383 reviews)
- Birdeye (Emergency Room): 1.7/5 stars (131 reviews)
- U.S. News & World Report (Patient Experience Score): 4/5 score
Patients praise
- Professional and attentive staff in some departments
- Modern and clean facility environment
- Efficient pharmacy services in certain instances
- Positive experiences reported with labor and delivery care
Common complaints
- Long wait times in emergency and urgent care services
- Difficulties with timely medical assessment and medication administration
- Frustrations regarding communication with staff and physicians
- Concerns about quality of patient care and facility responsiveness
"Came in ambulance at 3:20pm and did not get pain meds until 6:05pm. ... Extreme pain, crying out for help & nurse said the available Dr couldn’t help."
— Patient review on Birdeye"I had a very positive experience at Kaiser’s Emergency Department. The staff was professional, attentive, and moved quickly while still taking the time to explain what was going on."
— Patient review on Birdeye (Emergency Room)Synthesized from public review platforms as of Jul 11, 2026 — sources: [1][2][3][4].
In the News
- Dr. Guillermo V. Amurao, MD - Internal Medicine Physician in Ontario, OH — May 14, 2026
- Dr. Ronald L. Casey, MD - Internal Medicine Physician in Galion, OH — May 14, 2026
- Dr. Hedy C. Loa, MD - Internal Medicine Physician in Ontario, CA — May 14, 2026
- Dr. Michael H. Mun, DO - Internal Medicine Physician in Ontario, CA — May 14, 2026
- Dr. Edward U. Oh, MD - Internal Medicine Physician in Ontario, CA — May 14, 2026
Information sourced from the clinic's website as of July 11, 2026.
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