You can also email MemberServices@iehp.org. If you have BOTH Medicare and Medi-Cal with IEHP: If you have questions, call IEHP DualChoice Member Services at 1-877-273-IEHP (4347), 8am-5pm (PST), 7 days a week, including holidays. TTY users should call 1-800-718-4347. You can also email MemberServices@iehp.org. If you are a PROVIDER:.