Pulmonary function testing has come into widespread use since the 1970s. This has been facilitated by several developments. Because of miniaturization and advances in computer technology, microprocessor devices have become portable and automated with fewer moving parts.
You will pay Part B premiums as long as you keep the card. Those who are not automatically enrolled in Part B can sign up during their initial Medicare enrollment period which begins three months before their 65th birthday and ends three months after the 65th birthday.
When to enroll in Part B. This is trickier. If you get it wrong, it can cost you money. If you are already retired or will retire right at 65, the answer is simple: sign up for Part B the same time you enroll in Part A. If you are still working, you're going to have to figure out the right time to enroll on your own.