She attended the University of Santo Tomas Faculty of Medicine and Surgery for medical school and subsequently trained at a hospital affiliated with Loyola University for residency. Dr. Costello's areas of expertise include psychiatry. She honors Aetna EPO, Blue Cross/Blue Shield, and Coventry, in addition to other insurance carriers. She is affiliated with Northwestern Medicine Central DuPage Hospital, Ann & Robert H. Lurie Children's Hospital of Chicago, and Northwestern Medicine Regional Medical Group. Her practice is open to new patients.