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Medicare
Call Us 909-822-2323
Call Us 909-822-2323

Come on in!

We’re proud to tell you that Pinnacle Medical Group has joined the Optum family and that our name has changed to Optum. Just like Pinnacle Medical Group, Optum strives to make health care simpler and help people feel their best.

To learn more about Optum, please visit optum.com/about-us/optum-care.

Contact Us
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Patient Portal

Online portal for booking appointments, test results, doctor messaging and more.

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Urgent Care

Our Urgent Care is open 365 days a year to better serve your family.

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Meet Our Doctors

Family Practice, Pediatric, Internal Medicine and other specialties.

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Book your flu shot today!

Call 909-822-2323

New Patients Welcome

Learn how to join Optum, formerly Pinnacle Medical Group, or make an appointment for existing members.

New Patient Center
Call us 909-822-2323

Welcome to Optum, formerly Pinnacle Medical Group

Come on in for Urgent Care and Family Care with Pediatric, Family and Internal Medicine doctors that accept most insurances including Medicare, Employer and Medi-Cal plans. Locations in Fontana, Rialto, San Bernardino, Yucaipa and Rancho Cucamonga.

Meet our doctors and see the difference that comes with a team that cares. Learn more

Pinnacle Medical Group offers personal care by primary care physicians and at their Urgent Care Centers. Learn More

From our online patient portal to urgent care centers and preventative care providers, Pinnacle Medical Group provides services to be your complete medical care provider. Learn More

Patient Testimonials

Thumbs up!! You always see me at my appointment time. I recommended Pinnacle Medical Group to my family.
Oscar M.
The physician and staff were very cooperative, nice attitude and answered all questions to the fullest.
Angelica S. of Fontana
The best service I ever had!
Noel M. of Fontana
Trina at the front desk was very friendly and professional. The nurses assisting were helpful and friendly.
Annette
I would just like to say Jackie (nurse) is a great person. She is an asset to your company – a keeper!
Lourdes P.
Always – the entire team is excellent.
Luz D. of Ontario,
Very friendly and professional. It’s a pleasure to come here. Thanks!
Glenn T. of Rialto
Today’s service was immaculate. The receptionist was kind and friendly and just phenomenal!
Patricia B.
Dr Buhay is wonderful! I recommend her to anyone who asks! I could not have a better doctor!
Claire U.
Service was excellent. Staff was very helpful and welcoming.
Veronica L. of Rancho Cucamonga
I have been coming to Pinnacle since 2000 and have recommended this office to my family and friends.
Oscar M. of Rialto
Dr. Adan and her staff are very courteous, patient and caring - always taking the time to talk directly to the kids.
Adriana Godinez
Excellent service from everyone.
Robert H. of Rialto
Very pleased with the help and that the doctor took an aggressive approach to my healing.
Linda P. of San Bernardino
Dr. Buhay is a good and caring MD. I always recommend her to my friends and family.
Fred of Fontana
Good every time I come in.
Marcus L. of Rialto
Dr. Guadiz is a good doctor who takes great interest in his patients.
Vicki B. of Rialto
We were here on a Saturday and were treated very kindly and efficiently. Thanks!
Debbie Q. of Rialto
Always very kind, polite and caring. They truly care about their patients and the patient’s health and well-being.
Victoria C.
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Our Care Partners

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Come on in!

Join Our Group

New patients are always welcome at Pinnacle Medical Group. To begin, we encourage you to make an appointment with a primary care physician as soon as possible. Click on the button below or call us at 909-427-9960 to learn more.

New Patient Center
Pinnacle Medical Group offers personal care by primary care physicians and at our Urgent Care Center. Simply choose a Family Practice, Pediatric or Internal Medicine doctor through your insurance.

Quick Links

Locations

  • Rancho Cucamonga (909) 466-6579 - map
  • San Bernardino (909) 881-4115 - map
  • Rialto (909) 421-2700 - map URGENT CARE
  • Fontana (909) 427-1303 - map
  • Yucaipa (909) 500-7971 - map
© 2023 Pinnacle Medical Group - Website by Whitefrog.