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.
For most people, the initial enrollment period for Medicare Part A and Part B starts 3 months before their 65th birthday and ends 3 months after their 65th birthday. After initial open enrollment there are two open enrollments each year where you can switch your plan or add to it.