MercyCare Health Plans; Provider-Based Billing; Patients & Visitors. Pay Your Bill; ... (888) 39-MERCY Wisconsin & Illinois. Mercyhealth Barrington 500 W. Hwy. 22 Barrington, IL 60010 (847) 381-3000; Hours. website builder. Telehealth visits available. Monday-Thursday: 8:30 am-4:30 pm..