Patient Reviews. and more... Patient Testimonials. I'm so happy I purchased a report, I learned that my doctor has been over charging me for medication for years. ... EZDoctor Report Summary. Dr. BAYARD W CHANG M.D. Phone(s): (916) 929-2526 (916) 929-6128. Specialties: Internal Medicine. CA - 207R00000X. NPI: 1104816255. Gender: MALE. License ....