How Much Is Medicare Part D Penalty? 
I would add this to be clear . It 's 1 % per month . So if you go without creditable coverage and no Part D plan for 3 years -LRB- 36 months -RRB- ; your penalty will be 36 % on top of your Part D premium . That penalty is administered by CMS , so it can not be escaped . Each carrier will notify CMS that they are covering you when you sign up . CMS will notify them of your penalty and it will be applied to your premiums . 