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William James Mosley II, MD

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My specialty:

My provider affiliation:
Kaiser Permanente physician

I speak: English

My gender: Male

Where I practice

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About me

Hi! Thanks for visiting my Web page to get to know me a little better. Being available, compassionate, and respectful are important qualities that I value and wish to bring to every doctor-patient relationship. I am excited to be serving as your cardiologist, and I look forward to providing you excellent care.


I aspire to bring energy and information to my patients here at Kaiser Permanente. Together, we can work to prevent the progression of heart disease, and if it needs to be fixed with a procedure, we can accomplish that, too.

About my practice

I am a Detroit native, but I spent most of my adult years in Chicago. I started at Northwestern University, majoring in biomedical engineering, and then completed medical school at the University of Illinois. I then returned to Northwestern for the next six years for internal medicine and cardiology training. Although I love Chicago—the food, people, and culture—I moved to San Diego for advanced interventional cardiology training at Scripps Hospital. At Scripps, I learned cutting-edge interventional techniques in several areas, including complex angioplasty, percutaneous aortic valve replacement, and peripheral vascular intervention. After completing training in San Diego, my supportive wife and I decided to make our home in Southern California. As an interventional cardiologist, I have a special interest in the technical and procedural aspects of treating heart disease; however, a healthy lifestyle with a balanced diet and regular exercise is the most effective approach to prevent heart disease. While I was in fellowship training, I started a cardiovascular health program at an inner-city church. With weekly lectures and collective group planning, participants were able to lose weight, decrease waist size, and reduce blood pressure.

How I thrive

Having a complete and balanced life is very important to my family and me. I have a wonderful wife and a toddler whom I adore. Our faith takes priority, and we are active in our church. Through the church, we have participated in a few medical mission trips abroad to Central America. I am a big sports fan, following both Detroit and Chicago teams. I enjoy playing tennis and golf, dancing, and listening to a variety of music. My latest interest is learning to speak Spanish, and I hope to be fluent, or at least a functional communicator, to further enhance my patient care.

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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
Cardiology 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

University of Illinois College of Medicine
Chicago , IL

Board certification

Interventional Cardiology

American Board of Internal Medicine

Cardiovascular Disease

American Board of Internal Medicine

Medical training


Internal Medicine

McGaw Medical Center of Northwestern University
Chicago , IL


Internal Medicine

McGaw Medical Center of Northwestern University
Chicago , IL


Cardiovascular Disease

McGaw Medical Center of Northwestern University
Chicago , IL


Interventional Cardiology

Scripps Clinic and Research Foundation
La Jolla , 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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