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Stephen Guion Williams Jr., MD

Photo of Stephen Guion Williams Jr., MD
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My specialty:

My provider affiliation:
Kaiser Permanente provider

I speak: English

My gender: Male


Find out about

Where I practice

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  • Pharmacy services
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About me

Welcome to my Web page. I am happy to introduce myself, and tell you about my practice. I have had the privilege to practice at several university hospitals in California, and feel very fortunate to serve as chief of the urology department at Kaiser Permanente’s Riverside Medical Center. My fellow physicians, many of whom are nationally recognized for their expertise, are among the best I have ever worked with.


I was born and raised in Philadelphia, and came to Northern California for my surgical training. I moved to Southern California in 1999, and I now call it my home, with my wife and two children.

About my practice

My practice focuses on urologic oncology – cancers of the urinary tract. My specialty is surgical treatment of urologic cancers such as prostate, bladder, testicular, or kidney cancer. My department works closely with the departments of radiation oncology and medical oncology to provide a multi-disciplinary approach to treatment. This means that I work closely with specialists in non-surgical treatments such as radiation and chemotherapy to help determine what treatment or combination of treatments might be best for each individual patient. My team includes several nurse specialists who assist in providing the best possible care for each member, through every phase of their treatment. We feel that member education is vital to good health, whether it be in preparing for surgery, or in counseling patients on proper diet and nutrition. We are committed to providing patients compassionate and personal care.

How I thrive

I have always been a strong believer in the philosophy of total health, and try to live it in my life every day. Family life and staying active are big priorities for me. I feel very blessed to have a wonderful, supportive wife, and two healthy teenage boys. While we spend most of our vacation time in the summer visiting our extended families in the Midwest and back East, we try to find time every winter to get out and ski or snowboard. I strive to exercise regularly during the week, and in recent years, have begun competing in triathlons. I spent many years coaching my sons' Little League baseball and youth basketball teams. Now that my sons are older, I get to coach WITH THEM in our community youth leagues – and what a pleasure that has been! Having been born and raised in Philadelphia, my heart is with my Philadelphia sports teams, and I remain a diehard Eagles, Phillies, Flyers, and 76'ers fan.

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My office

Languages spoken by medical staff

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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
Urology Department
10800 Magnolia Ave, Riverside, CA 92505

Contact information

  • Advice/appointments
  • 1-833-574-2273 (toll free)
  • Information
  • 951-353-3005 (TTY for the hearing/speech impaired)
  • Information from Moreno Valley
  • 951-247-3183
  • Medical Center Operator
  • 1-833-574-2273 (toll free)

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My training, certifications and licensing

Medical school

Loyola University Chicago Stritch School of Medicine
Maywood , IL

Board certification


American Board of Urology

Medical training


UC Davis Medical Center
Sacramento , CA



UC Davis Medical Center
Sacramento , CA



Kenneth Norris Jr Cancer Hospital and Research Institute
Los Angeles , 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)

4867 W Sunset Blvd, Los Angeles, CA 90027

I have admitting privileges at this hospital.

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

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To find:

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  • 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

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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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