Part D plans cover:

• Prescription drugs
• Insulin
• Medical supplies associated with the injection of insulin (e.g., syringes, needles, alcohol swabs, and gauze) or delivering insulin into the body (e.g., an inhalation chamber)
• Vaccines not covered by Part B, for example vaccines for:
  • The shingles
  • Respiratory syncytial virus (RSV)
  • Tetanus-diphtheria whooping cough

For examples of drugs not covered by Part D, go to:
https://www.medicare.gov/providers-services/original-medicare/not-covered