Called up my local office a few months before it was time.They had all my records on file. Didn't have to provide anything..If you've been filing tax forms and your employer has been filing the right forms, you should be all set. That was 4 years ago. Did have to fill out form telling them I wanted my benefits starting at age 2. Medicare - same way....automatically kicked in......Supplement - wow..that generated 25 lbs of mail and solicitations......and everyone who wants to sell you one wants a 'face to face' meeting to explain the benefits. I don't think the law allows you to do it any other way it seems. Then you get bombarded year after year with more mail for Medicare Advantage plans and for changing supplement providers. t.