Who Is Eligible For Medicare Part B Coverage? 
Individuals who reside in the United States and Puerto Rico who are eligible for premium free Medicare Part A are automatically enrolled in Medicare Part B . You can notify Medicare to not enroll if you choose . Medicare Part B is voluntary and has a premium . There is also and penalty associated with not enrolling when you are eligible without creditible coverage . A person who is not eligble for premium free Part A but is a citizen of the United States or a legal Permanent Resident that has lived in the United States for the previous 5 continuousyears is also eligible for Medicare Part B . 