Dr. Chien sees patients at two locations: 680 N Lake Shore Suite 118 in Chicago and at 2809 Butterfield Rd Suite 300 in Oak Brook. As of July 1, 2021, he opted out of Medicare and sees patients on a contractual basis. As of November 27, 2021, he will be out of BCBS and as of January 1st, 2022 he will be out of all commercial insurance..