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general medicine, organs, ventura

Internal Medicine

From routine exams, to diagnosing and managing more complex conditions, our internists provide primary care for patients 18 and older.


Internal Medicine is offered at these locations:

Internal Medicine Specialists:

  • Dr. Paul Cisarik, Bio »
    Paul Cisarik, M.D.

    Dr. Paul Cisarik

    Internal Medicine

    Dr. Paul Cisarik received his medical degree from Saint George’s University School of Medicine, completed his residency at MetroHealth Medical Center, and his master’s degree in nutrition from Case Western Reserve University. He is a diplomate of the American Board of Internal Medicine and the American Board of Obesity Medicine. Dr. Cisarik specializes in internal medicine with a focus on nutritional therapy. This includes medically supervised weight loss, management of medical and nutritional issues before bariatric surgery, as well as long-term care after bariatric surgery. He also provides nutritional support for disorders of malnutrition, including treatment of nutritional deficiencies and dietary counseling in relation to different gastrointestinal disorders. Dr. Cisarik speaks English, Spanish, Slovak and conversational Serbo-Croatian.

    Dr. Paul Cisarik practices at these locations:

  • Dr. David Lyons, Bio »

    Dr. David Lyons

    Internal Medicine

    Dr. David Lyons received his medical degree from Ohio State Medical School and completed residency training at New England Medical Center in Boston. Dr. Lyons is board certified in both internal medicine and nephrology.

    Dr. David Lyons practices at these locations:

  • Dr. Gustavo Riffel, Bio »

    Dr. Gustavo Riffel

    Internal Medicine

    Dr. Gustavo Riffel received his medical degree from University of Buenos Aires, School of Medicine and completed a dermatology residency there, as well as an internal medicine residency at St. John’s Episcopal Hospital in Far Rockaway, NY. Dr. Riffel is a member of the American Medical Association and American College of Physicians.

    Dr. Gustavo Riffel practices at these locations:

  • Dr. Brian Santini, Bio »

    Dr. Brian Santini

    Internal Medicine

    Dr. Brian Santini received his medical degree from George Washington University Medical School in Washington D.C. and completed residency training at Legacy Portland Hospital System in Oregon. Dr. Santini is certified by the American Board of Internal Medicine and is a member of the American Medical Association.

    Dr. Brian Santini practices at these locations: