The main Medicare phone number you can use for Part D prescription drug plan questions is 1-800-MEDICARE (1-800-633-4227) , with TTY 1-877-486-2048.

Core contact numbers

  • General Medicare & Part D help: 1-800-MEDICARE (1-800-633-4227), available 24/7 except some federal holidays.
  • TTY for hearing impaired: 1-877-486-2048.
  • Social Security (for enrollment, name changes, disability-related Medicare issues): 1-800-772-1213 (TTY: 1-800-325-0778).

Who to call for Part D–specific issues

For Medicare Part D, there are two main paths:

  • Questions about coverage in general (how Part D works, rights, complaints):
    • Call 1-800-MEDICARE and follow the prompts for prescription drug (Part D) questions.
  • Questions about your specific Part D plan (premiums, copays, drug list, pharmacy network):
    • Call the customer service number on your Part D plan ID card , which is issued by a private insurance company.

In practice, 1-800-MEDICARE helps with overall Medicare and can take complaints about a Part D plan, while the number on your Part D card handles plan-specific billing, drug coverage, and pharmacy issues.

Best times and tips for calling

  • Call early in the morning or later in the evening to reduce hold times, especially during fall open enrollment (Oct 15–Dec 7).
  • Have this ready before you call:
    • Medicare number
    • List of prescriptions and pharmacies
    • Your Part D plan card (if enrolled)

Information gathered from public forums or data available on the internet and portrayed here.