Changing a practice location with Medicare takes a while. Adding a practice location with Medicare usually happens much faster.
You might consider adding the new location as an additional practice location before the move, so that Medicare has both addresses in its system. That way, they will accept billing from both locations. After the move has been completed successfully, and things have settled down, you can submit a request to Medicare to delete the first practice location address. Much less disruption to business doing it this way.