Which statement best describes Part A versus Part B eligibility criteria for Medicare?

• A. Part A generally requires work credits for premium-free eligibility.
• B. Part B eligibility is limited to individuals with high income.
• C. Part A is available only with a monthly premium and tight enrollment.
• D. Part B never requires premiums and has restricted enrollment.

Answer: (A)

The main idea being tested is how Medicare Part A and Part B eligibility relate to work history and premiums. Part A's premium-free eligibility is earned through work credits. If you or your spouse paid Medicare payroll taxes for enough quarters (typically 40 quarters, about 10 years), you qualify for Part A at no monthly premium. If you don’t have enough work credits, you can still get Part A but it isn’t premium-free (you’d pay a monthly premium). That’s why stating that Part A premium-free eligibility generally requires work credits is the best description.

Part B works differently. It generally carries a monthly premium for most people, and enrollment isn’t determined by the number of work credits you have. Eligibility to enroll in Part B is about being already eligible for Medicare, not whether you’ve earned enough work credits to be premium-free, and while premiums exist, they aren’t tied to the same work-credits rule as Part A.

So the correct statement aligns with the fact that Part A premium-free status hinges on work credits, while Part B involves a separate premium and standard enrollment process.