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Prasit B. Vassantachart, MD

Photo of Prasit B. Vassantachart, MD

My specialty:
Internal Medicine

My provider affiliation:
Kaiser Permanente provider

I speak: English

My gender: Male


Find out about

Where I practice

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  • Emergency service
  • Urgent care services
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  • Pharmacy services
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About me

Welcome to my Web page. I'm happy to have this chance to introduce myself and tell you about my practice. At Kaiser Permanente, I am surrounded by many wonderful colleagues and patients, and I'm looking forward to caring for your health.


I was born in Bangkok, Thailand. From a young age, my mother taught me the importance of education and service to others. With these values in mind and following the footsteps of my grandfather and brother, I decided to pursue a career in medicine. After high school, I came to the United States and attended colleges and medical school along with residency training in Southern California. I also worked for the Loma Linda Faculty Medical Group before joining Kaiser Permanente in 1989. My wife and I have three children. We all love to volunteer in various community activities: churches, libraries, hospitals, schools, health fairs, international missions, and sports events. Recognizing the importance of exercise, I spend a considerable amount of time promoting and helping many people in the sport of running and triathlons.

About my practice

Being a doctor gives me the very special privilege to help patients with their physical, mental, and in some cases spiritual needs. My staff and colleagues in the clinic and at Kaiser Permanente Fontana Medical Center work as a team to provide comprehensive health care based on current medical evidence. I firmly believe in preventive care and healthy lifestyle, along with the use of advanced diagnostic tests and treatments. I am happy to see that this organization shares the same beliefs and is leading the way to becoming one of the nation's best in preventive care systems. Practicing for over 20 years, I strive to treat each patient individually as I would my own family.

How I thrive

I enjoy outdoor activities, such as running, hiking, biking, skiing, and swimming. Sharing and helping others enjoy these same activities is one of my passions. Through these activities, I have made many friends and have completed several endurance sports events, including over 15 marathons and five Ironman Triathlons. I have climbed to the summit of Mt. Whitney three times, and once I did the 34-mile Cactus-2-Cloud hike from Palm Springs up to San Jacinto peak and back down. Most recently, I participated in the Kaiser Permanente Los Angeles Triathlon with several of my friends, colleagues, and patients. I invite you to participate in your local events, such as a 5K walk or run. You will be surprised at how much you can do and enjoy the benefits of exercise. Please say hello to me if we meet, whether on the hiking trail, on the road, at the gym, or in the swimming pool.

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My office

Languages spoken by medical staff

Help is available in your language. Learn more.

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My provider type

Physicians and Surgeons

Medical groups and plans

Southern California Permanente Medical Group

List Header Plans Accepted
  • Exclusive Provider Organization (EPO)
  • HMO
  • Medi-Cal Managed Care
  • Point-of-Service Plan (POS)
  • Senior Advantage/Medicare Cost
Internal Medicine Department
9961 Sierra Ave, Fontana, CA 92335

Contact information

  • Appointments/information
  • 1-833-574-2273 (1-833-KP4CARE) (toll free)
  • Information
  • 1-866-735-2922 (toll-free TTY for the hearing/speech impaired)

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My training, certifications and licensing

Medical school

Loma Linda University School of Medicine
Loma Linda , CA

Board certification

Geriatric Medicine

American Board of Internal Medicine

Internal Medicine

American Board of Internal Medicine

Medical training


Internal Medicine

Loma Linda University School of Medicine
Loma Linda , CA


Internal Medicine

Loma Linda University School of Medicine
Loma Linda , CA

Joined Permanente Medical Group


Active license information

License number


License type


License issuing state


National Provider Identifier (NPI)

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My hospitals

All Kaiser Permanente physicians and podiatrists have admitting privileges or the ability to refer patients to our plan hospitals. Admitting privileges of other providers may vary by plan and facility. Contact your plan administrator for details.

9961 Sierra Ave, Fontana, CA 92335

I have admitting privileges at this hospital.

Setting the standard: Measuring care quality in our hospitals(PDF)

2295 S Vineyard Ave, Ontario, CA 91761

I have admitting privileges at this hospital.

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To find:

  • a provider's office hours, search our facility directory
  • providers in your plan or accepting new patients, call 1-800-464-4000 (toll free) or 711 (TTY for the hearing/speech impaired)

The information in this online directory is updated periodically. The availability of physicians, hospitals, providers, and services may change. Information about a practitioner is provided to us by the practitioner or is obtained as part of the credentialing process. 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 (toll free). You can also call the Medical Board of California at 916-263-2382, or visit their website.

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. These may include bilingual providers, staff, and healthcare interpreters. In-person, telephone, video, and alternative modes of communication are available. Learn more about interpreter services

If you would like to report an error in provider or facility information, please contact us.

Kaiser Permanente enrollees have full and equal access to covered services, including enrollees with disabilities as required under the Federal Americans with Disabilities Act of 1990 and Section 504 of the Rehabilitation Act of 1973.

Kaiser Permanente uses the same quality, member experience, or cost-related measures to select practitioners and facilities in Marketplace Silver-tier plans as it does for all other Kaiser Foundation Health Plan (KFHP) products and lines of business.The measures may include, but are not limited to, HEDIS/CAHPS performance, member/patient complaints, patient safety scores, hospital quality measures, and geographic need. Members enrolled in KFHP Marketplace plans have access to all professional, institutional and ancillary health care providers who participate in KFHP plans’ contracted provider network, in accordance with the terms of members’ KFHP plan of coverage. All Kaiser Permanente Medical Group physicians and network physicians are subject to the same quality review processes and certifications.
Kaiser Permanente uses the same geographic distribution consideration to select hospitals in Marketplace plans as it does for all other Kaiser Foundation Health Plan (KFHP) products and lines of business. Accessibility of medical offices and medical centers in this directory: All Kaiser Permanente facilities are accessible to members.


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