If you need health insurance with a lower premium this may be of help to you.... https://www.healthcare.gov/how-can-i-get-ready-to-enroll-in-the-marketplace/

The tax for those who don’t comply starts at $95 per adult in 2014 (or 1 percent of annual household income, whichever is greater) and grows to $695 by 2016 and beyond (or 2.5 percent of income). The penalty will be assessed on your federal tax return.

But the law contains many exemptions. For instance, you won’t have to pay a tax penalty if:
•you’re a member of a federally recognized Native American tribe,
•you’re incarcerated,
•you’re in the country illegally,
•you belong to a religion that opposes accepting benefits from a health insurance policy,
•you cannot find "affordable" coverage, meaning the cost of your premium would be more than 8 percent of household income, or
•your household income is low enough that you’re not required to file a federal tax return

A few basics for other readers: Medicare is the subsidized national health system for people 65 and over.

Medicare Part A, known as the "hospital insurance" portion, helps pay for inpatient hospital stays, inpatient skilled nursing facility stays (after a hospital stay), some home health care and hospice care.

Medicare Part B, known as the "medical insurance" portion, helps pay for outpatient medical care such as doctor visits, lab tests and durable medical equipment.

Even though Part A offers limited coverage, it still will meet Obamacare’s insurance requirement, says Jack Cheevers of the U.S. Centers for Medicare & Medicaid Services.

So technically, you’ll be fine.  However, you may want to get supplemental insurance, though it isn't mandatory.