I have been involved with a Medicare nightmare since May 2010, and part of it was to do with address change. We had changed address on NPI website, also NPPES website (I think that's what it's called). Then Medicare sent something to a 15 yr old address that, of course, came back and said my provider client needed to fill out 855I to revalidate.
This is only a part of the nightmare, but my point is, changing address on NPI website does not count, according to Medicare. They said provider was responsible to know this from pg. who knows what of the Provider Integrity Manual. She's been a MC provider since 1995. How many providers would know this?