New Search 10820 Practice accepting new patients. William W. Chang, DO (949) 443-4303 Primary Specialties Pulmonology (Board Certified) Secondary Specialties Critical Care Medicine Internal Medicine Medical Groups & Affiliations Mission Heritage Medical Group Mission Hospital Affiliated Physicians Paloma Medical Group Additional Languages Spoken Mandarin Chinese, Taiwanese Primary Office Address: 30230 Rancho Viejo Rd. Suite 200 San Juan Capistrano, CA 92675 Phone: (949) 443-4303 Fax: (949) 443-4033 Hours: Mon - Fri: 8 a.m. - 4:30 p.m. Secondary Office Address: 16305 Sand Canyon Ave. Suite 225 Irvine, CA 92618 Phone: (949) 443-4303 Fax: (949) 443-4033 Recommend this Physician Request an Update for this Physician Get Directions The patient rating score is based on responses and comments from Press Ganey. Responses are measured on a 10 point scale, with 10 being the best score. These scores are then translated to a 5 point scale in order to display results in a 5 Star rating. Comments are also gathered from the same survey and displayed in their entirety with the exception of any language that may be considered libel, or may contain private health information, or is unrelated to the provider being reviewed. Learn more about Press Ganey star rating calculations Education Medical School: Michigan State University - College of Osteopathic Med. Internship: Loma Linda University Medical Center Residency: Loma Linda University Medical Center Fellowship: Loma Linda University Medical Center - 2006 Board Certified in Pulmonology Certifications American Board of Internal Medicine Areas of Interest Evaluation, diagnosis, and coordinated care for cough and shortness of breath. Compassionate care of the critically ill.