The essentials
How this coverage works
You must have Medicare Parts A and B and continue paying the Part B premium.
Plans may be HMOs, PPOs, or other plan types, each with different network and referral rules.
Many plans include prescription drug coverage and may offer dental, vision, hearing, fitness, or other benefits.
Premiums are usually low or $0, but only one part of the cost; copayments, coinsurance, deductibles, and the yearly out-of-pocket limit also matter.
