Medicare Part A is basic hospital insurance. That means hospitalization coverage, including hospital stay, skilled nursing facility care, home health care (skilled nursing, physical therapy) and hospice care. For the majority of people, there is no charge for Medicare Part A and it is provided premium-free as long as you meet a few basic eligibility requirements.
If you are a permanent resident of the United States and you or a spouse paid into Social Security while you were employed, Medicare Part A is free and you are enrolled automatically. However while there is no monthly charge, there are still out-of-pocket expenses and you are responsible for deductibles and co-insurance.