Health (2 days ago) You can contact Health First Health Plans' Customer Service Department with any questions or comments by phone , mail, in person or online. Medicare members: For further assistance, call Customer Service toll-free at 1.800.716.7737 (TTY/TDD relay: 1.800.955.8771 ) weekdays from 8 a.m. to 8 p.m. and Saturdays from 8 a.m. to noon..