What are the qualifications to get Medicare Part A Hospital at no cost?
Medicare and You 2019 #10050 - Everything you want to know * See their section on closing the donut hole
To be eligible for premium-free Part A, Hospital – an individual must be entitled to receive Medicare based on their own earnings or those of a spouse, parent, or child.
To receive premium-free Part A, the worker must have a specified number of quarters of coverage (QCs)  and file an application for Social Security or Railroad Retirement Board (RRB) benefits.
The exact number of QCs (quarters) required is dependent on whether the person is filing for Part A on the basis of age, disability, or End Stage Renal Disease (ESRD). QCs are earned through payment of payroll taxes under the Federal Insurance Contributions Act Wikipedia (FICA) during the person’s working years.
Most individuals pay the full FICA tax so the QCs they earn can be used to meet the requirements for both monthly Social Security benefits and premium-free Part A.
Medicare Enrolling in Parts A & B # 11036 28 Pages
Medicare has different parts
Medicare Part A (Hospital Insurance)
Medicare Part B (Medical Insurance)
Can I get Part B if I don’t have Part A?
How do I know if I have Part A or Part B?
Medicare Part C (also known as Medicare Advantage)
Medicare Part D (prescription drug coverage)
When can I sign up?
Getting Part A and Part B automatically
Signing up for Part A and Part B
Turning 65 and you or your spouse is still working
Medicare and End-Stage Renal Disease (ESRD)
Can I still get Medicare at 65?
I have Health Insurance Marketplace coverage
I have coverage through a health savings account (HSA)
Living outside the U. S.