Dr. Casas is a licensed Family Medicine in CA. Medical degree obtained from Keck School of Medicine of USC. Completed residency training at Kaiser Permanente. Currently practices at Kaiser Permanente (Kaiser Permanente), located at 320 Lennon Ln, Walnut Creek, CA 94598. Dr. Casas specializes in family medicine and primary care.. In addition to English, Dr. Casas speaks Mandarin.