Dr. Tsai is board certified Internal Medicine. He is your primary care physician (PCP). Think of him as your healthcare advocate and official "Gatekeeper". It is his job to care, monitor and manage all your medical needs...from RX refills, common colds to terminal diagnosis and family interactions.

William J. Tsai, M.D., Inc. is a Membership based solo private practice. There's an annual (out of pocket, non-medical) fee to keep/maintain accessibility to Dr. Tsai as PCP to render any/all medical services and advice. Please call office 949 955 0202 for more information. Thank you.

Once you are an established patient of our clinic, Dr. Tsai evaluates and determines whether or not you have needs to see Specialists. From there he has an adequate, most qualified and competent "rolodex" of Specialists in neighboring areas to confidently refer you to.

Once you are an established patient of our clinic, Dr. Tsai will render any/all necessary requisition orders for bloodwork, imaging and other diagnostic tests.

For "fasting" lab requisition orders, please follow office protocols: NO foods or drinks 10 hours prior to blood draw. Only water is allowed! Allocate 2-3 business days for labs to forward final results to us.

For non-controlled meds: Please call your RX, ask them to FAX over to us 949 955 0203 your refill request(s). Once we receive it, Dr. Tsai will take care of it accordingly. For controlled substances: If it's been more than three(3) months since your last appointment, Dr. Tsai requires an appointment w/ him or Tina Thomas NP first before either of them can take care of your request.

Dr. Tsai is on active staff at Hoag Hospital Newport Beach.

Our office is open from Monday - Friday from 10:00am - 5:00pm. We are closed on weekends. For any/all medical urgencies after hours when office is closed - please call 949-955-0202 and follow the paging instructions to get promptly routed to Dr. Tsai.

Tina Thomas, NP works full days at our office on Mondays and Wednesdays.

Dr. Tsai is fluent in English, Mandarin and Taiwanese. Office staff is fluent in English and Mandarin.