A number of posters (here , here and here) at the Google Maps for Business owners over the past several months have noted that their listing in the Local 10Pack had been missing the phone number. This bug was fairly widespread and had befallen three of my listings including my infamous medical listing.
All instances that I was experiencing of missing phone numbers as well as a number that I checked at the Google Maps for Business Group has shown up.
As an aside my medical record has been totally repaired and all remaining issues of gender confusion has been fixed as well.
Google has not indicated in the Group whether they would look at these records or not, but it appears either that the bug responsible has been quashed in most cases or enough time has passed that the records caught up with themselves.