Which Drugs Are Covered By Medicare Part B? 
Most drugs are covered under Medicare Part D. Part D is a private insurance plan you purchase from an insurance carrier . There may be more than 40 different plans in your area . You should review the total costs of each plan and compare formulary 's . Drugs administered in your doctor 's office , in a hospital or clinic , are usually covered by Medicare Part B. Most are infusion therapy drugs , such as those used as part of a chemotherapy routine . 