If you choose a brand-name medication when a generic is available, you will have to pay your copay plus the cost difference between the brand-name and generic medication. You may apply for a prior authorization for a brand-name exception, and if approved, you can receive the brand-name medication at the Preferred copay. Be aware that you must meet HealthChoice guidelines for medical necessity. Contact Medco toll-free at 1-800-841-5409 to request a brand-name medication at the Preferred copay. TDD users call 1-800-871-7138.