Answer

How does Medicare work, and when should I sign up?

The short answer

Medicare is federal health insurance for people 65 and older and some younger people with disabilities. Part A covers hospital care, Part B covers doctors, and Part D covers drugs. You choose Original Medicare or a Medicare Advantage plan. Your first sign-up window lasts 7 months around your 65th birthday.

Key takeaways

  • Original Medicare lets you see any provider that takes Medicare. Medicare Advantage usually uses a network and may need approvals.
  • Missing your sign-up window can mean a monthly Part B penalty for as long as you have Part B.
  • Free, unbiased counseling is available through your State Health Insurance Assistance Program (SHIP).

What you can do next

  1. Mark the start and end of your 7-month sign-up window on a calendar.
  2. List your doctors, hospitals, and prescriptions before comparing plans.
  3. Call your State Health Insurance Assistance Program (SHIP) for free help choosing.

Read the full lesson

Words in this lesson

Medicare
Federal health insurance for people 65 and older and for some younger people with disabilities or certain conditions.
Medicare Advantage (Part C)
A private plan approved by Medicare that bundles Part A, Part B, and usually drug coverage. It often uses a network and may require prior authorization.
Medigap
Extra insurance from a private company that helps pay your share of costs in Original Medicare. Plans are standardized and named by letters in most states.
Coinsurance
Your share of a covered cost as a percentage, such as 20%, usually after you meet your deductible.
Prior authorization
Your plan's approval before certain care. Approval is not a guarantee of payment.

Related

This is general education. For decisions about your own plan, taxes, or legal rights, check your plan documents or a qualified professional.

Sources

  1. Parts of Medicare Centers for Medicare & Medicaid Services. Applies to: current site. Published or updated: Unknown. Retrieved: November 5, 2026.
  2. When does Medicare coverage start? Centers for Medicare & Medicaid Services. Applies to: current site. Published or updated: Unknown. Retrieved: November 5, 2026.
  3. Medicare.gov Centers for Medicare & Medicaid Services. Applies to: current site. Published or updated: Unknown. Retrieved: .