Wed 8:00am - 4:00pm. Thu 8:30am - 4:30pm. Fri 8:00am - 4:00pm. Sat Closed. Sun Closed. Make an Appointment. (716) 636-1947. Karen F. Giardino, MD is a medical group practice located in Williamsville, NY that specializes in Endocrinology, Diabetes & Metabolism, and is open 5 days per week. Providers Overview Location Reviews..