Gisella Tay Yong is an Internal Medicine doctor in Vacaville, California. Dr. Tay Yong has been practicing medicine for over 20 years is highly rated in 14 conditions, according to our data. Her top areas of expertise are Maturity Onset Diabetes of the Young, Type 2 Diabetes (T2D), Visceromegaly, and Thrombocytopenia.