The types of insurance listed below are all considered creditable prescription drug coverage , and in most cases, it will be your advantage to keep this coverage if you have it. Federal Employee Health Benefits (FEHB) Program : This is health coverage for current and retired federal employees and covered family members. FEHB plans usually include prescription drug coverage, so you don't need to join a Medicare drug plan. However, if you decide to join a Medicare drug plan, you can keep your FEHB plan, and in most cases, Medicare will pay first.  Veterans' Benefits: This is health coverage for veterans and people who have served in the U.S. Military. You may be able to get prescription drug coverage through the U.S. Department of Veterans Affairs (VA) program. You may join a Medicare Prescription Drug Plan, but if you do, you can't use both types of coverage for the same prescription at the same time. TRICARE (military health benefits): This is a health c...