Express Scripts Medicare (PDP) 2019 Formulary (List of Covered Drugs) PLEASE READ: THIS DOCUMENT CONTAINS INFORMATION . ABOUT SOME OF THE DRUGS COVERED BY THIS PLAN. Formulary ID Number: 19057, v5. This formulary was updated on 08/24/2018. For more recent information or to price a medication, you can visit us on the Web at express-scripts.com.