Medicare Enrollment Denial

Hmmmm- I am not really sure if it will be rejected but I do believe that sooner or later they will figure it out and depending on the Medicare plan you have you may have to do some justification with the insurer because they base your premiums on where you live - this would be important for a Medicare Advantage plan, a prescription drug plan or a Medigap plan.  Some plans are only available in certain areas and Medigap premiums matter by state and zip.  

Could a different address be considered a little white lie to them if they challenged a plan claim - I don’t know specifically but maybe.  The only reasons for a cancelation of a Medigap plan is non payment of premiums or a fib on the application but would that just be under a health question and not an address - I do not know. 

As long as you are living in the US, I cannot think of a situation where it would matter with Social Security except they do need an address to contact you if need be.