Learn the basics on prescription drug coverage under Medicare. Six-page Tip Sheet explains how prescription drugs, medicines and immunizations might be covered under Medicare Part B, Medicare Advantage plans (Part C) or Medicare Part D (the drug plan for seniors). Includes Covid-19 vaccine. Includes guidelines for cancer drugs, injectibles and IV drugs. Generally, Part A (hospital insurance) does not cover outpatient drugs. Publication 11315-P updated July 2021.